JPH0481365B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a resonator used in an oscillator or a filter.

Prior Art A conventional resonator will be described below with reference to the drawings. FIG. 11 is a side sectional view of a conventional resonator, in which 1101 is a conductor case, 1102 is a resonant coil made of a spirally wound conducting wire, 1103 is an open terminal, 1104 is a ground terminal, 1105 is an input/output coil, and 1106 is a resonant coil made of a spirally wound conductor. Input/output terminal 1107 is a hole for input/output terminal.

The operation of the resonator configured as above will be explained below. A resonant coil 1102 in which a conducting wire is spirally wound is installed inside the cavity of a cylindrical or rectangular conductor case 1101, a ground terminal 1104 is electrically connected to the conductor case 1101, and an open terminal 1103 is left open. There is. The resonant coil 1102 resonates with its own inductance and stray capacitance. Furthermore, the resonant coil 1102 is
It is magnetically coupled to the input/output coil 1105 and coupled to an external circuit at the input/output terminal 1106 via the input/output terminal hole 1107. (For example, AIZverev,
etal：Realization of a filter with helicol
components，IRE Trans.on Components pant
8.No.3.P99 1961) Problems to be Solved by the Invention However, in the conventional structure, since the inside of the conductor case is hollow, the stray capacitance is small and the conductor length of the resonant coil becomes long. Losses increase and Q deteriorates. Furthermore, the structure was complicated because input and output coils were required.

The present invention provides a resonator that has a simple structure, is less susceptible to external influences, and has a high Q.

Means for Solving the Problems In order to solve the above problems, the resonator of the present invention has one end of the resonant coil placed inside the conductor case as an input/output terminal, and the conductor case is filled with a dielectric material. That's true.

Effects The present invention has the above-described configuration, which makes it less susceptible to external influences by arranging the resonant coil inside the conductor case, and simplifies the structure by using one end of the resonant coil as the input/output terminal of the resonator. At the same time, by filling the conductor case with dielectric material, stray capacitance increases, so when obtaining the same resonant frequency compared to the conventional structure, the conductor length of the resonant coil can be shortened, reducing conductor loss and achieving a high Q. This will result in the realization of a resonator.

Embodiment A resonator according to an embodiment of the present invention will be described below with reference to the drawings.

1 and 2 are a side sectional view and a top view of a resonator in an embodiment of the present invention. In FIGS. 1 and 2, 1 is a conductor case, 2 is a resonant coil, 3 is a filled dielectric, 4 is an input/output terminal, 5 is a ground terminal, 6 is a bottom surface, and 7 is an open surface. Furthermore, Figure 1,
In FIG. 2, the resonant coil 2 is shown in a side view and a top view with everything other than the resonant coil 2 removed. The conductor case 1 has a cylindrical shape and has an open surface 7 with one side open perpendicular to the central axis and a bottom surface 6 with the other side closed. A resonant coil 2 having a structure in which a conducting wire is spirally wound has a grounding terminal 5 at one end of the conducting wire and an input/output terminal 4 at the other end,
A ground terminal 5 disposed inside the conductor case 1 is electrically connected to the bottom surface 6, and an input/output terminal 4 is taken out from the open surface 7 side and connected to an external circuit. Further, the inside of the conductor case 1 is filled with a dielectric material 3. The resonant coil 2 resonates with its own inductance and stray capacitance, but the stray capacitance increases due to the influence of the dielectric constant of the dielectric 3, so the resonant frequency decreases. That is, for the same resonant frequency, the length of the conducting wire is shortened to reduce the self-inductance of the resonant coil 2, thereby reducing conductor loss and increasing the Q of the resonator. Furthermore, since one end of the resonant coil 2 is used as the input/output terminal 4, the structure can be simplified. Furthermore, resonant coil 2
is arranged inside the conductor case 2 and the ground terminal 5
is directly electrically connected to the conductor case 2, so that the electromagnetic field distribution related to resonance is confined within the conductor case 2 and is less susceptible to external influences.

Next, a second embodiment of the present invention will be described with reference to the drawings.

FIG. 3 is a side sectional view of a resonator in a second embodiment of the invention. In Figure 3, 1, 2,
3, 4, 5, 6, and 7 are the same as those in FIGS. 1 and 2, and 8 is the side surface of the conductor case 1. In addition, in FIG. 3, the resonant coil 2 is a side view with components other than the resonant coil 2 removed. Resonant coil 2
The grounding terminal 5 is the same as in FIGS. 1 and 2 except that it is electrically connected to the boundary point between the side surface 8 and the bottom surface 6 of the conductor case 1 or in the vicinity thereof.

Connect the ground terminal 5 to the side surface 8 of the conductor case 1 as described above.
Since the resonant coil 2 is not mechanically bonded to the bottom surface 6, the bottom surface 6 is molded separately from the side surface 8, and the resonant coil 2 It becomes possible to attach the bottom surface 6 to the side surface 8 after attaching the side surface 8.

Next, a third embodiment of the present invention will be described with reference to the drawings.

FIG. 4 is a side sectional view of a resonator in a third embodiment of the invention. In Figure 4, 1, 2,
3, 4, 5, 6, 7, 8 are Fig. 1, Fig. 2, Fig. 3
It is the same as the figure, and 9 is a screw hole and 10 is a screw. A screw hole 9 along the central axis is formed in the center of a dielectric 3 filled inside a resonant coil 2, and a metal screw 10 is fitted into the screw hole 9. By moving the screw 10 up and down along the central axis, the electromagnetic field distribution inside the resonator can be changed, so the resonant frequency can be varied. Note that the screw 10 is not limited to metal, and may be any material that can change the electromagnetic field distribution, such as a dielectric material or a magnetic material.

Next, the embodiment of the present invention shown in FIG. 4 will be described with reference to the drawings.

5 and 6 are a side view and a perspective view of a resonator according to a fourth embodiment of the present invention, and FIG. 7 is a side view of a resonator of the present invention mounted on a circuit board having an external circuit. It is a diagram. Figure 5, Figure 6, Figure 7
In the figure, 11 is a ground terminal, 12 is a circuit board, 13 is a ground pattern on the circuit board, 14 is a circuit pattern on the circuit board, and 15 is solder. , similar to FIG. By providing the ground terminal 11 integrated with the conductor case 1 on the open surface side of the conductor case 1, the conductor case 1 of the resonator is electrically and mechanically connected to the ground of the external circuit via the ground terminal 11. Ru. For example, as shown in FIG. 7, the resonator is inserted from the back side of the circuit board 12 having an external circuit, and the ground terminal 11 is connected to the ground pattern 13 of the circuit board 12.
By electrically connecting with the solder 15, the conductor case 1 is electrically connected to the ground pattern 13 of the circuit board 12 via the ground terminal 11 with a simple mounting method, and the resonator is connected to the circuit board 12 and mechanically. Fixed. Further, the input/output terminal 4 is electrically connected to the circuit pattern 14 by solder 15 and coupled to an external circuit. Next, a fifth embodiment of the present invention will be described with reference to the drawings.

8 and 9 are a side view and a perspective view of a resonator according to a fifth embodiment of the present invention, and FIG. 10 is a side view when the resonator of the present invention is mounted on a circuit board having an external circuit. It is a diagram. In Figures 8, 9, and 10, 4' is an input/output terminal, 11' is a ground terminal, and the others are as shown in Figures 1, 2, 3, and 4.
It is similar to FIG. 5, FIG. 6, and FIG. 7. A ground terminal 11' integrated with the conductor case is provided on the open surface side of the conductor case 1 so as to be taken out in a direction perpendicular to the central axis. As shown in FIG. 10, the resonator is attached to the circuit board 12 having an external circuit so that its center axis is parallel to the circuit board 12, and the ground terminal 11' is electrically connected to the ground pattern 13 of the circuit board 12 with solder 15. By connecting the conductor case 1 to the circuit board 12, the conductor case 1 is electrically connected via the ground terminal 11' of the ground pattern 13 of the circuit board 12 with simple mounting, and the resonator is mechanically fixed to the circuit board 12. In addition, the input/output terminal 4' is connected to the circuit pattern 14 and the solder 1
It is electrically connected at 5 and coupled to an external circuit.

Since the resonator is mounted so that its central axis is located parallel to the circuit board 12, if the length of the resonator in the axial direction is longer than the length in the direction perpendicular to the axial direction, the circuit board 12 The component mounting height is lower. In addition, when the resonator has a frequency variable mechanism as shown in Embodiment 3, there is no need to drill a hole in the circuit board for an adjustment screwdriver inserted into the screw hole 9 to move the screw 10, and the adjustment screwdriver It is possible to eliminate the adverse effects caused by the proximity of the circuit pattern 14 to the circuit pattern 14.

Note that in the first, second, third, fourth, and fifth embodiments, the conductor case is cylindrical, but it may be cylindrical.

Effects of the Invention As described above, by arranging the resonant coil inside the conductor case, the electromagnetic field distribution related to resonance is located inside the conductor case, making it less susceptible to external influences. By using input/output terminals, the structure becomes simple, and by filling the conductor case with a dielectric material, the length of the conductor wire of the resonant coil can be shortened, so that a small size and a high Q can be realized.

Furthermore, by electrically connecting the grounding terminal of the conductor of the resonant coil to the boundary point between the side surface of the conductor case and the bottom surface, or in the vicinity thereof, the bottom surface and side surface of the conductor case were molded separately, and the resonant coil and the side surface were attached. It is possible to install the bottom surface later.

Furthermore, the resonant frequency can be varied by providing a screw hole in the dielectric inside the resonant coil, fitting a metal, dielectric, or magnetic screw into the screw hole and moving the screw.

Furthermore, by providing one or more ground terminals that are electrically connected to the conductor case on the open side of the conductor case, the conductor case can be grounded to the external circuit ground through the ground terminal with simple installation. be able to.

Furthermore, by taking out the ground terminal at right angles to the axial direction of the resonator, when the resonator is mounted on a circuit board and the length of the resonator in the axial direction is longer than the length in the direction perpendicular to the axial direction, The mounting height on the circuit board can be lowered. Further, when the resonator has a frequency variable mechanism, there is no need to make a hole in the circuit board for the frequency adjustment driver, and the adverse effects caused by the adjustment driver coming close to the circuit pattern can be eliminated.

[Brief explanation of the drawing]

1 and 2 are a side sectional view and a top view of a resonator according to a first embodiment of the present invention, respectively, and FIG.
The figure is a side sectional view of a resonator in a second embodiment of the present invention, FIG. 4 is a side sectional view of a resonator in a third embodiment of the present invention, and FIGS. 5, 6, and 7 are The side view and perspective view of the resonator according to the fourth embodiment of the present invention, and the side view of the resonator mounted on an external circuit board, respectively, and FIGS. 8, 9, and 10 are those of the fifth embodiment of the present invention. Side view, perspective view of the resonator in the example,
and side view when mounted on external circuit, 1st
FIG. 1 is a side sectional view of a conventional embodiment. 1... Conductor case, 2... Resonance coil, 3...
Dielectric, 4, 4'... Input/output terminal, 5... Ground terminal, 9... Screw hole, 10... Screw, 11, 11'
...Earth terminal.

Claims (1)

[Claims] 1. A conductor case in which a conducting wire is spirally wound inside a cylindrical or prismatic cylindrical conductor case that has an open surface on one side perpendicular to the central axis and a closed bottom surface on the other side. A resonant coil is arranged, one end of the conductor is used as a ground terminal and the other end is used as an input/output terminal, the ground terminal is electrically connected to a part of the conductor case, and the input/output terminal is taken out from the open surface side. , a resonator characterized in that the conductor case is filled with a dielectric material. 2. Claim 1, characterized in that the grounding terminal of the conductor is electrically connected to the bottom surface of the conductor case.
Resonator described in section. 3. The resonator according to claim 1, wherein the ground terminal of the conducting wire is electrically connected to a boundary point between the side surface and the bottom surface of the conductor case or in the vicinity thereof. 4. A screw hole is made in the center of the dielectric filled inside the resonant coil along the central axis, and a screw made of dielectric, metal, or magnetic material is inserted into the screw hole so that the screw is aligned with the central axis. The resonator according to claim 1, 2, or 3, characterized in that the resonator has a structure that allows the resonator to be moved up and down mechanically. 5. Claims 1, 2, and 5, characterized in that the conductor case has a structure in which one or more ground terminals are electrically connected to the conductor case on the open surface side thereof. The resonator according to item 3 or 4. 6 Claim 5, characterized in that the direction in which the ground terminal is taken out is perpendicular to the central axis.
Resonator described in section.