JPH061874B2 - Variable tuning transformer device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable tuning transformer device that can be used in radios, television transmitters and receivers, and other communication devices in general.

Configuration of conventional example and its problems In recent years, the number of broadcast radio waves of radios and televisions and communication radio waves of communication devices has been increasing, and the performance of the variable tuning transformer device that selects the frequency of the radio wave desired to be received is high. Stability and reliability are needed. On the other hand, reducing the manufacturing cost of receivers, transmitters, and communication devices in which variable tuning transformers are installed is also a major issue, and especially the development of drastic new technology for tuning circuit parts in the high-frequency part, which is difficult to rationalize. is necessary.

A conventional variable tuning transformer device will be described below with reference to the drawings. Fig. 1 shows a conventional variable tuning transformer circuit. (1) is a primary inductor, (2) is a secondary inductor,
(3) is a variable capacitor that controls the tuning frequency by forming a parallel resonance circuit together with the primary inductor, and (4) is also a trimmer capacitor, each of which forms a variable tuning transformer (5). The signal source (7) is normally connected to the input terminal (6) of the variable tuning transformer (5), while the load (9) is connected to the output terminal (8). The tuning transformer (5) has heretofore been realized by a configuration of parts as shown in FIG. That is, as shown in Fig. 2, a primary inductor and a secondary inductor are connected to a common core (1
The inductor component (11) wound around (0) and the variable capacitance element (12) and trimmer capacitor (13) are connected separately by circuit conductors (14) and (60) to form a parallel resonant circuit. The variable tuning transformer device is constructed by taking out the secondary output terminal (61), and the tuning frequency is changed by supplying a control signal to the control terminal (62) of the variable capacitance element (12).

However, in the above configuration, (1) in order to form a parallel resonant circuit, it is necessary to install a trimmer capacitor component in parallel with the primary inductor component, and the trimmer capacitor component can adjust the variable tuning frequency range. I was adjusting. The trimmer capacitor component is a mechanically tuned component, has poor vibration resistance, and has a large component form, which deteriorates the stability of the tuning frequency and hinders the miniaturization of the tunable transformer device. Further, the conventional technique has a disadvantage that it is impossible to reduce trimmer capacitor parts.

(2) The inductor component (11) includes the primary inductor (1) and the secondary inductor (2), and its configuration required that two lead wires be insulated from each other and wound in space. . Therefore, it is difficult to determine the mutual positional relationship between the primary inductor and the secondary inductor, and there are considerable variations in the coupling relationship.
The coupling coefficient also depends on the positional relationship of the core (10) with respect to each of the primary inductor (1) and the secondary inductor (2). Therefore, when adjusting the tuning frequency by adjusting the core (10), There has been the inconvenience that the coupling coefficient changes significantly.

(3) As shown in Fig. 2, the inductor component (11) has a larger size than other components, and in particular, the height dimension is very large, which makes it possible to reduce the size and thickness of the device. It was blocking. Furthermore, the ferrite material core inserted in the coil of the inductor component has its set position fluctuated due to mechanical vibration, which causes the tuning frequency to fluctuate significantly. Further, the inductance is unstable due to the large temperature dependency of the magnetic permeability μ in the core of the ferrite material, and the tuning frequency also fluctuates greatly due to this. At the same time, the tuning Q was also affected and changed greatly. Furthermore, in order to stably secure the tuning frequency at the set target value, it is necessary to install each component at the set position with high accuracy, especially when mass-producing as a high frequency variable tuning transformer device, to ensure the installation accuracy. However, the tuning frequency largely deviates from the set target value and cannot be converged to a constant value, which causes a problem in mass productivity.

(4) The problem with the one shown in FIG. 2 is that the inductor and the capacitor are formed as separate parts, and they are connected to the installed parts via circuit conductors with long paths. Was configured into. As a result, many unnecessary lead inductances and stray capacitors are generated, which makes the operation of the tunable transformer device unstable and makes it difficult to achieve the initial design goals. Therefore, a lot of time is spent on design work including correction. Also, since each variable tuning transformer device is a collective circuit of separate parts of independent minimum functional units, it is impossible to deal with the reduction of the number of parts and the rationalization of manufacturing by the existing technical concept. There is a limit to the cost reduction of the transformer device.

Had problems such as.

An object of the present invention is to integrate an inductor component and a trimmer capacitor component into an equivalent configuration, and to form a trimmer capacitor between a primary inductor and a secondary inductor, thereby changing the variable reactance element. It contributes to arbitrarily adjusting the variable range of the variable tuning frequency, which makes it possible to reduce trimmer capacitor parts, make the form extremely thin and compact, and to prevent mechanical vibration and changes in ambient temperature. It is another object of the present invention to provide a variable tuning transformer device which has a stable tuning frequency and further operates stably even in a high frequency region by eliminating the adverse effects of the connection leads.

In order to achieve the above object, the present invention provides a so-called ground terminal or common terminal position in which the positions of the ground terminals or the common terminals in the respective electrodes opposed to each other through the dielectric are not opposed to each other. Is set so as not to be in plane symmetry with respect to the center plane between the respective electrodes, and an input signal source is connected to a required portion of one of the electrodes and the other of the electrodes. An output load is connected to a required portion, and a variable reactance element is connected and installed between a required portion of one of the electrodes and the ground terminal or the common terminal. A primary inductor, the other electrode acts as a secondary inductor, and each electrode forms a transformer. Further, each electrode faces each other to form a distributed constant circuit by a transmission line whose tip is open, and a capacitor is realized by the negative reactance generated by this shunt distribution circuit, which is parallel to the primary inductor by the one electrode. Can be made to act on.

Description of Embodiments A variable tuning transformer according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 (a) shows a circuit configuration of the variable tuning transformer device in one embodiment of the present invention. In FIG. 3 (a), (90) is a primary inductor composed of one electrode, and (91) is a secondary inductor composed of the other electrode. The primary inductor (90) faces the secondary inductor (91) via a dielectric (not shown), and the ground terminals of the inductors are opposite to each other, that is, the ground leads are from opposite sides. The variable tuning transformer device (93) is formed by connecting the variable capacitance element (92) to the primary inductor (90). The input signal source (95) is normally connected to the input terminal (94) of the primary inductor (90) of the tunable transformer device (93), while the output terminal of the intermediate tap of the secondary inductor (91). An output load (97) is connected to (96). Here secondary inductor (91)
By arbitrarily cutting the electrode portion existing between the open terminal (98) and the output terminal (96) in (3), the function of the trimmer capacitor can be exerted, whereby the variable tuning frequency range can be set arbitrarily. Further, here, the connection and installation of the variable capacitance element (92) to the primary inductor (90) and the installation location of the input terminal (94) are arbitrary, and the tip of the primary inductor (90) is an open terminal (not shown). It is also possible to adjust the tuning inductance and tuning capacitance at the same time by setting to () and cutting arbitrarily.

FIG. 3 (b) shows a constituent circuit of a variable tuning transformer device according to another embodiment of the present invention. In FIG. 3 (b), (101)
Is a primary inductor composed of one electrode, and (102) is a secondary inductor composed of the other electrode. Primary inductor (1
01) is a secondary inductor (102) via a dielectric (not shown)
And the respective ground terminals are set so that the ground terminals are opposite to each other, that is, the ground outlets are from opposite sides, respectively, and the variable capacitance element (103)
Is connected to the secondary inductor (102) to form a variable tuning transformer device (104). Then, normally, the input signal source (106) is connected to the input terminal (105) of the variable tuning transformer device (104), while the output load (108) is connected to the output terminal (107). Here, the primary inductor (10
By arbitrarily cutting the electrode portion existing between the open terminal (109) and the input terminal (105) in 1), the function of the trimmer capacitor is exerted, and thereby the variable tuning frequency range can be set arbitrarily. . Further here 2
Variable capacitance element (10
The connection installation of 3) and the installation location of the output terminal (107) are arbitrary, and the tip of the secondary inductor (102) is set to an open terminal (not shown) and cut arbitrarily to adjust the tuning inductance and The tuning capacitance can also be adjusted simultaneously.

FIG. 3 (c) shows a configuration circuit of a variable tuning transformer device according to still another embodiment of the present invention. In FIG. 3 (c),
(110) is a primary inductor composed of one electrode, and (111) is a secondary inductor composed of the other electrode. The primary inductor (110) faces the secondary inductor (111) through a dielectric (not shown), and further, the respective ground terminals are in mutually opposite sides, that is, the ground leads are respectively from opposite sides. A variable tuning transformer device (113) is formed by connecting and setting the voltage variable capacitance element (112) to the primary inductor (110).
And normally, the input terminal (11
An input signal source (115) is connected to 4), while an output load (117) is connected to the output terminal (116). Here, open terminal (118) and output terminal (1) in the secondary inductor (111)
The variable tuning frequency range can be arbitrarily set by making the trimmer capacitor function by arbitrarily cutting the electrode portion existing between 16).
Further, here, the connection and installation of the voltage variable capacitance element (112) to the primary inductor (110) and the installation location of the input terminal (114) are arbitrary, and the primary inductor (1
The tuning inductance and the tuning capacitance can be simultaneously adjusted by setting the tip of 10) to an open terminal (not shown) and cutting it arbitrarily. (11
9) is a control voltage supply terminal of the voltage variable capacitance element 112.

FIG. 3 (d) shows a constituent circuit of a variable tuning transformer device according to still another embodiment of the present invention. In Fig. 3 (d) (12
0) is a primary inductor composed of one electrode, and (121) is a secondary inductor composed of the other electrode. Primary inductor
(120) is a secondary inductor (12) via a dielectric (not shown).
1), and the ground terminals are set so that they are on the opposite sides, that is, the ground outlets are on the opposite sides, and the voltage variable capacitance element
The variable tuning transformer device (123) is formed by connecting (112) to the secondary inductor (121). And normally, the input signal source (125) is connected to the input terminal (124) of the variable tuning transformer device (123), while the output terminal (126) is also connected.
An output load (127) is connected to. Here, the function of the trimmer capacitor is exerted by arbitrarily cutting the electrode portion existing between the open terminal (128) and the input terminal (124) in the primary inductor (120), thereby making the variable tuning frequency range arbitrary. Can be set to. Further, here, the connection and installation of the voltage variable capacitance element (122) to the secondary inductor (121) and the installation location of the input terminal (126) are arbitrary, and the tip of the secondary inductor (121) is an open terminal (not shown). It is also possible to adjust the tuning inductance and the tuning capacitance at the same time by setting (No.) and cutting arbitrarily. Reference numeral (129) is a control voltage supply terminal of the voltage capacitance element (112).

FIG. 4 shows the configuration of the variable tuning transformer device according to the first embodiment of the present invention. 4 (a) is a front view of the variable tuning transformer device, FIG. 4 (b) is a side view thereof, and FIG. 4 (c) is a rear view thereof. In FIGS. 4A to 4C, (15) is a plate-shaped dielectric made of ceramic or the like, and (16) is an electrode for forming a primary inductor on the surface of the dielectric (15). Reference numeral (17) is an electrode forming a secondary inductor installed on the back surface of the dielectric (15) so as to face the electrode (16), and the electrode (17) is distributed along with the electrode (16). A circuit is formed and a capacitor is formed. (18) is the electrode (1
It is the ground terminal of 6), and (19) is the open terminal in the electrode (16). On the other hand, in the electrode (17), the terminal (18) of the electrode (16) and the opposite side (20) are the ground terminals, and (21)
Is an open terminal.

5 (a) to 5 (c) show the configuration of the variable tuning transformer device in the second embodiment of the present invention. Plate-shaped dielectric in the figure
Fig. 4 shows the installation configuration of electrode (23) and electrode (24) for (22).
Same as the embodiment described in (a) to (c), but the position of the common terminal is reversed, (25) is an open terminal in the electrode (23), and (26) is the electrode (23 ) Ground terminal. On the other hand, (27) is the ground terminal of the electrode (24), and (28) is the electrode (2
It is an open terminal in 4).

FIGS. 6 (a) to 6 (c) show the configuration of the variable tuning transformer device according to the third embodiment of the present invention. Electrodes (30) that form the primary inductor on the same surface of the plate-shaped dielectric (29) as shown in the figure.
And an electrode (31) forming a secondary inductor are arranged side by side, and the electrodes (30) and (31) face each other on their side surfaces. (32) is an arm terminal of the electrode (30), and (33) is an open terminal. On the other hand, in the electrode (31), (34) is an open terminal and (35) is an earth terminal of the electrode (31). Here, the terminal modes for the respective electrodes (30) and (31) are the opposite directions of the ground terminal and the open terminal as described in FIGS. 4 (a) to (c) and FIGS. 5 (a) to (c). If it is on the side, it can be set arbitrarily.

7 (a) to 7 (c) show the configuration of the variable tuning transformer device according to the fourth embodiment of the present invention. The installation configuration and terminal mode of the electrode (37) forming the primary inductor and the electrode (38) forming the secondary inductor with respect to the plate-shaped dielectric (36) are the fourth.
Similar to the embodiment described in Figures (a)-(c), but with electrodes (37)
And the area of the electrodes (38) are not the same, and
(37) and (38) are installed so as to partially face each other.

6 (a)-(c) through 10 (a)-(c) show the construction of the variable tuning transformer device in the fifth through seventh embodiments of the present invention. The installation configuration and terminal mode of the electrode (40) forming the primary inductor and the electrode (41) forming the secondary inductor with respect to the plate-shaped dielectric (39) in FIG. 8, the plate-shaped dielectric in FIG. Installation configuration and terminal mode of electrode (43) and electrode (44) with respect to (42), and dielectric in FIG.
The installation configuration and the terminal mode of the electrode (46) and the electrode (47) with respect to (45) are the same as those in the embodiment described in FIGS. 4 (a) to (c), but each electrode has at least one arbitrary position. The one having a bent portion indicating the bending angle and the bending direction is used.

11 (a) to 11 (c) show the configuration of the variable tuning transformer device according to the ninth embodiment of the present invention. The installation configuration and terminal mode of the electrode (49) forming the primary inductor and the electrode (50) forming the secondary inductor with respect to the plate-shaped dielectric (48) are the same as those of the embodiment described in FIG. , Each electrode having a spiral shape is used.

12 (a) to 12 (c) show the configuration of the variable tuning transformer device according to the ninth embodiment of the present invention. The installation configuration and terminal mode of the electrode (52) forming the primary inductor and the electrode (53) forming the secondary inductor with respect to the plate-shaped dielectric (51) are the same as those in the embodiment described in FIG. , The electrode (53) is the electrode
The structure is such that they are installed so as to partially face each other within the range included in the area of (52).

13 (a) to 13 (c) show the configuration of the variable tuning transformer device according to the tenth embodiment of the present invention. The installation configuration and terminal mode of the electrode (55) forming the primary inductor and the electrode (56) forming the secondary inductor with respect to the plate-shaped dielectric (54) are the same as those of the embodiment described in FIG. , Each electrode
(55) and (56) are provided inside the dielectric (54).

14 (a) and 14 (c) show the structure of the variable tuning transformer device according to the eleventh embodiment of the present invention. An electrode (58) forming a primary inductor is installed on the inner peripheral part of the cylindrical dielectric (57), and an electrode (59) forming a secondary inductor is installed on the outer peripheral part so as to face the electrode (58). It was done. The ground terminals of the electrodes (58) and (59) are set to be in opposite directions. Here, as the dielectric (57), not only the cylindrical one but also the rectangular one can be used, and the installation positions of the primary inductor and the secondary inductor are also the intermediate tap (130) in FIG. The intermediate tap (131) in FIG. 5 and the intermediate tap (13) in FIG.
2), intermediate tap (133) in FIG. 7, intermediate tap (134) in FIG. 8, intermediate tap (135) in FIG.
Intermediate tap (136) in FIG. 10, intermediate tap (137) in FIG. 11, intermediate tap (138) in FIG. 12, intermediate tap (139) in FIG. 13, intermediate tap (14 in FIG.
0) is an intermediate tap set to the output terminal or the input terminal, respectively.

Furthermore, the variable capacitance element (9
2), the variable capacitance element (103) in FIG. 3 (b),
Voltage variable capacitance element (112) in FIG. 3 (c),
The voltage variable capacitance element (122) in FIG. 3 (d) is the electrode (17) in FIG. 4, the electrode (24) in FIG. 5, the electrode (31) in FIG. 6 or the electrode (in FIG. 7). 38) or the electrode in FIG. 8
(41) or electrode (44) in FIG. 9 or electrode (47) in FIG. 10 or electrode (50) in FIG. 11 or electrode (53) in FIG. 12 or electrode in FIG.
(56) Or it is connected and installed between the earth terminal and the required open terminal in the electrode (58) in FIG. Each of the electrodes in the embodiments described with reference to FIGS. 6, 7, and 12 to 14 may have the electrode shape of the embodiment described with reference to FIGS. 8 to 11.

Further, in the embodiment shown in FIGS. 8 to 11, the bent portion is formed in the shape of a square arc having an arbitrary bending angle. However, in addition to this, the bent portion is an arc having an arbitrary curvature. It goes without saying that the electrodes may be formed in the pattern of.

Furthermore, in the embodiment shown in FIG. 13, both electrodes (55)
Electrode on any one side without installing (56) inside the dielectric (54)
(55) may be placed inside the dielectric (54) and the other electrode (58) may be placed on the surface of the dielectric (54).

In each of the above embodiments, the ground terminal of each electrode is not particularly set as the ground terminal,
Generally, the desired purpose can be achieved even if the terminal is set as a common terminal and connected to another circuit section (not shown).

In each of the above-described embodiments, those shown in FIGS. 4 and 5 can be configured with a simple electrode pattern, and a highly accurate electrode pattern can be easily formed. As a result, it is possible to realize a variable tuning transformer device that matches the design target tuning frequency with extremely high accuracy. As shown in FIG. 6, since both electrodes (30) and (31) can be formed only on one side of the dielectric (29), the manufacturing process can be simplified, and further both electrodes (30) can be formed.
(31) can be formed and processed in the same electrode forming process. As a result, the set position accuracy between the electrodes can be realized with extremely high accuracy, and the variable tuning transformer device that matches the designed target tuning frequency with extremely high accuracy can be configured. 7 and 12 can realize a variable tuning transformer device for a desired purpose even if the patterns of both electrodes do not completely match. As a result, it is possible to realize a variable tuning transformer device in which the tuning frequency can be set arbitrarily depending on the length and width of the portion where the two electrodes face each other. 8 to 11 can form a relatively large distributed inductor and distributed capacitor even if the area occupied by the variable tuning transformer device is small. Therefore, a small tunable transformer device having a relatively low tuning frequency can be realized, and the space factor of the tunable transformer device can be improved. The one shown in FIG. 13 can be introduced into the manufacturing process of a multilayer circuit board. This makes the electrode
Since the (55) and (56) are disposed inside the dielectric (54) and are not exposed to the outside, they are not directly affected by fluctuations in external conditions. Therefore, since it does not affect the tuning frequency of the variable tuning transformer device, the variable tuning transformer device having extremely stable performance can be realized. The one shown in FIG. 14 can form a sufficiently large inductor and capacitor even if the tunable transformer device is made smaller than that shown in FIGS. 4 to 13. Therefore, it is possible to realize a microminiature variable tuning transformer device having a sufficiently low tuning frequency. Also,
In the case of manufacturing this, as shown in FIG. 14, the electrodes (58) and (59) are continuously formed on a continuous cylindrical dielectric (57), and the dielectric (57) is cut into a required size and length. It is possible to manufacture in large quantities and easily.

As the transmission line electrode in each of the above embodiments, a metal conductor, a printed metal foil conductor, a thick film printed conductor, a thin film conductor or the like can be used, and the transmission line electrode is formed by combining different kinds of the above conductors. You may. On the other hand, as the dielectric, alumina ceramic, barium titanate, plastic, fluororesin, glass, mica, resin-based printed circuit board or the like can be used.

The operation of the variable tuning transformer device of this embodiment constructed as described above will be described below.

15 (a) to (e) (e) are equivalent circuits for explaining the operation of the variable tuning transformer device of the present invention. 15th
In the figure (a), a voltage e is generated for the transmission line formed by the respective transmission line electrodes (70), (71) having an electric length l and having their ground terminals set in opposite directions. A signal source (72) is connected to the transmission line electrode (70) to supply a signal. Then, the traveling wave voltage e _A is excited by the open terminal at the tip of the transmission path electrode (70). On the other hand, the transmission line electrode (71) is the above-mentioned transmission line electrode.
Since it is installed opposite to or close to (70),
A voltage is induced by the mutual induction effect. Let e _B be the traveling wave voltage induced at the open terminal at the tip of the transmission path electrode (71).

Here, since the earth terminals of the transmission line electrodes (70) and (71) are set in opposite directions, the induced traveling wave voltage e _B is opposite in phase to the excited traveling wave voltage e _A. Becomes Since the traveling wave voltages e _A and e _B are open at the tip of the transmission line, the transmission line electrodes (70)
A voltage standing wave is formed in the transmission line formed by (71) and (71). Here, if the voltage distribution coefficient indicating the distribution mode of the voltage standing wave at the transmission line electrode (70) is represented by K, the voltage distribution coefficient at the transmission line electrode (71) is (1-
K).

Therefore, next, the transmission line electrode (70) and obtains a potential difference V generated at any of the opposed parts in (71) when V = Ke A - can be represented by _{(1-K) e B ......} (1) . Where each transmission line electrode
If (70) and (71) have the same electric length l, then e _B = -e _A (2), so that the potential difference V in the first equation is V = Ke _A + (1-K) e _A = e _A …… (3) That is, the potential difference V can be generated in all the portions where the transmission path electrodes (70) and (71) face each other.

Here, the transmission path electrodes (70) and (71) are assumed to have the electrode width W (the thickness of the electrodes is thin), and they are opposed to each other at a distance d via a dielectric having a dielectric constant ε _S. Be present. In this case, the capacitance C ₀ formed per unit length of the transmission line is And therefore Becomes

Therefore, the transmission line shown in FIG. 15 (a) is a transmission line including the C ₀ distributed capacitor (73) obtained by the equation 6 per unit length not shown in FIG. 15 (b).

Further, as shown in FIG. 15 (c), this transmission line is composed of a distributed inductor component of the transmission line and a total distributed inductor (77) and (78) by a lumped inductor component generated by bending of the transmission line, respectively. It can be equivalently expressed as a distributed constant circuit including a distributed capacitor (73).

Next, the relationship with the electrical length 1 of the transmission line in forming the distributed capacitor (73) will be described. Characteristic impedance per unit length in the transmission line as shown in Fig. 16 (a)
Z ₀ can be represented by the equivalent circuit shown in FIG. 16 (b). Its characteristic impedance Z ₀ is generally Becomes If the transmission line is lossless, Becomes Many of the embodiments of the tunable transformer device of the present invention can apply this assumption, and use the characteristic impedance Z ₀ shown in the following equation 8 for simplification of description. The capacitance C ₀ in the equation 8 is the same as the capacitance C ₀ per unit in the transmission line obtained in the equation 6. That is, the characteristic impedance Z ₀ per unit length in the transmission line is a function of the capacitance C ₀ , which is also the permittivity ε _S of the dielectric material involved in the capacitor C _0.
It is also a function of the width W of the transmission line electrodes and the installation distance d of each transmission line electrode.

As described above, the characteristic reactance X per unit length in the transmission line is Z ₀ , the electrical length thereof is l, and the equivalent reactance X generated at the terminal of the transmission line having the open end is X = −Z ₀ It can be expressed as cotθ …… (9). here And especially In the case of, the equivalent reactance X is X = ≦ 0 (12). That is, the equivalent reactance at the terminals of the transmission line can be a capacitive reactance. Therefore, when θ corresponds to Expression 11 according to the electrical length l of the transmission line, that is, when the electrical length l is set to λ / 4 or less, the capacitor can be formed. And the capacitance C of the capacitor that can be formed is As shown by, the arbitrary capacitance C can be realized by changing θ, that is, by setting the electrical length l of the transmission line.

FIG. 17 is a diagram showing the operation mode of the transmission path described in the above Expressions 9 to 13. Seventeenth
In the figure, in the transmission line with the open end, the equivalent reactance X generated at the terminal changes according to the change of the electric length l. As is apparent from FIG. 17, the electrical length l of the transmission line is λ / 4 or less or λ / 2-
In the case of 3λ / 4 or the like, it is possible to form a negative terminal reactance, that is, a capacitor can be formed equivalently. Further, under the condition that a negative terminal reactance is generated, the electrical length l of the transmission line is
It is possible to realize the capacitance C to an arbitrary value by arbitrarily setting

The capacitor C thus formed is shown in FIG.
It can be equivalently replaced as the lumped constant capacitor (79) shown in (d). The inductor formed by the sum of the distributed inductor component existing in the transmission line and the lumped inductor component generated by bending the transmission line can be equivalently replaced as the lumped constant inductor (80). When the ground terminal is commonly used in FIG. 15 (d), the lumped-constant capacitor is finally obtained as shown in FIG. 15 (e).
This is equivalent to a parallel resonance circuit composed of (79) and a lumped constant inductor (80), and a tunable transformer device can be realized.

As is clear from the above description of the operating principle, the capacitance C of the formed capacitor shown in the thirteenth equation
Is a function of cotθ, that is, it depends on the length l of the transmission line as shown in the equation (10). The capacitance C of the capacitor thus formed can be arbitrarily determined by setting the length 1 of the transmission line. Therefore, in the embodiment of the variable tuning transformer device of the present invention, the open terminal electrode shown in FIGS.
(101) (109) (118) (128) by setting the length at the time of each design, or by cutting each electrode after the configuration, set the variable range in the tuning frequency of the tunable transformer device arbitrarily It is possible to

EFFECTS OF THE INVENTION As described above, the present invention is configured such that the ground terminal or the common terminal position in each electrode oppositely placed via the dielectric is set on the opposite side of each electrode, and An input signal source is connected to a required portion of one electrode and an output load is connected to a required portion of the other electrode, and a required portion of one of the electrodes and the ground terminal or the common terminal are connected. Since a variable reactance element is connected between them, a potential difference is effectively generated between each electrode, thereby forming a distributed capacitor, and a comprehensive inductor consisting of a lumped constant inductor and a distributed constant inductor by one electrode By operating in parallel, a parallel resonant tuning circuit can be configured equivalently, and one electrode A transformer can be formed by forming a secondary inductor and a secondary inductor by the other electrode, respectively, and a variable tuning transformer device can be realized by controlling the reactance change of the variable reactance element. Therefore, the following excellent effects can be obtained.

(1) As a variable tuning transformer device, the trimmer capacitor function that is indispensable for arbitrarily setting the variable range of the tuning frequency can be effectively realized between the primary inductor and the secondary inductor. The trimmer capacitor parts that were installed are no longer needed. That is, the transformer function and the trimmer capacitor function can be simultaneously and effectively acted by the respective electrodes facing each other. Moreover, the trimmer capacitor that is realized has no mechanical moving parts and can maintain a trimming capacitance that is extremely stable against mechanical vibration, thereby ensuring a stable variable tuning frequency over a long period of time. The excellent effect of being able to be obtained is obtained.

(2) A transformer inductor and a trimmer capacitor can be integrally configured by a very simple configuration using two electrodes functioning as a variable reactance element and a transmission line and one dielectric, and a simple manufacturing method. As a result, it is possible to realize a variable tuning transformer device that can be handled as a simple component.

(3) In addition, it is possible to realize a variable tuning transformer device that can be integrated as a transformer inductor and trimmer capacitor and can be handled as one component, and its form can be made thin and compact, and mechanically movable. The excellent effect that the variable tuning transformer device can be realized with the jule structure having no parts is obtained. Due to the effect, a tunable transformer device that is extremely stable against mechanical vibration can be realized, and it is extremely stable even in the ultra-high frequency range without the presence of unstable elements such as lead inductance and stray capacitor due to unnecessary connection lead wires. It is possible to realize such a variable tuning transformer device, and further, it is possible to obtain an excellent effect that the number of parts of the variable tuning transformer device can be reduced and the space factor can be improved.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a conventional variable tuning transformer device, FIG. 2 is a perspective view showing a component structure of the conventional variable tuning transformer device, and FIGS. 3 (a) to (d) are variable tuning transformer devices of the present invention. 4 (a) to (c) to FIGS. 13 (a) to (c) are front view, side view and back view of the tuning transformer section in the variable tuning transformer device in each embodiment of the present invention. FIGS. 14 (a) and 14 (b) are a side view and a top view of a tuning transformer section in a variable tuning transformer device according to another embodiment of the present invention, FIGS. 15 (a) to (e), and FIG. 16 ( 17A and 17B are explanatory views showing the operating principle of the tuning transformer section in the variable tuning transformer device according to the present invention. (15) (22) (29) (36) (39) (42) (45) (48) (51) (54) (57) …… Dielectric, (16) (17) (23) (24) (30) (31) (37) (38) (40) (41) (43)
(44) (46) (47) (49) (50) (52) (53) (55) (56) (58) (59) (70) (7
1) …… Transmission line electrode, (90) (101) (110) (120) …… Primary inductor, (91) (102) (111) (121) …… Secondary inductor, (9
2) (103) …… Variable capacitance element, (112) (122) ……
Voltage variable capacitance element, (95) (106) (115) (125) ...
… Input signal source, (97) (108) (117) (127) …… output load, (9
8) (109) (118) (128) …… Open terminal, (119) (129) ……
Control voltage supply terminal, (130) (131) (132) (134) (135) (136) (1
37) (138) (139) (140) …… Intermediate tap set for the input terminal or output terminal.

Continuation of front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location H03J 1/00 Z 8523-5K

Claims (9)

[Claims] 1. A different facing positional relationship in which the positions of the ground terminals or the common terminals in the respective electrodes facing each other via a dielectric are not facing each other, so-called the position of the ground terminal or the common terminal is the center between the respective electrodes. The input signal source is connected to the required portion of one of the electrodes and the output load is connected to the required portion of the other electrode. A variable tuning transformer device in which a variable reactance element is connected and installed between a required portion of any one of the electrodes and the ground terminal or the common terminal. 2. The variable tuning frequency range according to claim 1, wherein the variable tuning frequency range is arbitrarily set by cutting an arbitrary required portion of the electrode portion serving as an open terminal in each electrode. Tuning transformer device. 3. The variable tuning transformer device according to claim 1, wherein the respective electrodes are provided on the front and back of the dielectric. 4. The variable tuning transformer device according to claim 1, wherein the respective electrodes are provided on the same surface of the dielectric. 5. The variable tuning transformer device according to claim 1, wherein each electrode has at least one bent portion. 6. A tunable transformer device according to claim 1, wherein each electrode has a spiral shape. 7. The variable tuning transformer device according to claim 1, wherein the dielectric is cylindrical. 8. The variable tuning transformer according to claim 1, wherein each electrode is installed such that a part or all of at least one of the electrodes is located inside the dielectric. apparatus. 9. The variable tuning transformer device according to claim 1, wherein a voltage variable capacitance diode is used as the variable reactance element.