JPH03217105A - Fixing structure for dielectic resonator - Google Patents

Abstract

PURPOSE:To reduce the cost and to simplify the production process by arranging a dielectric resonator so that its plane parts do not face the surface of a microwave circuit board and the axial line passing these plane parts facing each other intersects a micro strip line and directly attaching the dielectric resonator to the micro wave circuit board. CONSTITUTION:A magnetic field is generated in the direction of the axial line passing plane parts 1a and 1b of a dielectric resonator 1. A magnetic flux F forming this magnetic field crosses a micro strip line 3. Since planes 1a and 1b do not face the surface of a micro wave circuit board 2 in this case, the Q value of a resonance circuit is not very much reduced though the dielectric resonator 1 approaches the microwave circuit substrate 2. Since the dielectric resonator 1 is semicylindrical and its flat part 1d where an electrode film 1e is formed is directed upward, the magnetic flux is scarcely formed above the flat part 1d, and the Q value is not very much reduced though a metallic case covering the microwave circuit substrate is close to the dielectric resonator 1.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a TEO. The present invention relates to a dielectric resonator fixing structure in which a dielectric resonator that resonates in the δ mode is attached to a microwave circuit board so as to be magnetically coupled to a microstrip line.

(Prior Art) Conventionally, this type of TEO. A dielectric resonator that resonates in the δ mode is attached to a microwave circuit board with a configuration as shown in FIG.

In this figure, the dielectric resonator l1 is made of a dielectric material and is formed in a cylindrical shape with opposing planar parts 1 1a and 11b and an outer peripheral part 11c connecting the planar parts 1 1a and 1 1b. has been done. The direction of the axis passing through the opposing plane portions 1 1a and 1 1b is the direction of propagation of the microwave. The support stand 12 is made of an insulating material, and is fixed to one plane part 11b of the dielectric resonator l1 with an adhesive or the like, and is attached with an adhesive or the like to the upper surface of the microwave circuit board l3. It is fixed in place. The dielectric resonator 11 is attached so that its flat portions 1 1a and I 1b face the surface of the microwave circuit board 13.

The microwave circuit board l3 is made of a dielectric material, and has a microstrip line 14 formed on its upper surface and a ground conductor l5 formed on its lower surface. Dielectric resonator l1 is microstrip line 14
is installed near the

In the fixing structure of the dielectric resonator as described above, a magnetic field is formed in the axial direction passing through the opposing plane parts 11a and 11b of the dielectric resonator 11, and the magnetic field is formed as shown in FIG. The magnetic flux F interlinks with the microstrip line l4.

In this way, the dielectric resonator 11 is magnetically coupled to the microstrip line l4 to form a resonant circuit. Therefore, by adjusting the distance a between the dielectric resonator 11 and the microstrip line 14, the degree of coupling between the two is adjusted, and as a result, the characteristics of the resonant circuit are adjusted.

(Problems to be Solved by the Invention) As described above, in the conventional dielectric resonator fixing structure, the dielectric resonator 11 is floated to a predetermined height using the support base 12. Planar part 1 of body resonator 11
1a, 1 1b get too close to the ground conductor 15 of the microwave circuit board 13, the proportion of magnetic flux in contact with the ground conductor 15 increases and the loss due to eddy current increases, which reduces the Q value of the resonant circuit. This is because

Therefore, since the support stand 12 is essential,
There are problems in that the number of structural members increases, which increases manufacturing costs, and it also requires work to secure the support base 12 to the dielectric resonator 1l, complicating the manufacturing process.

Further, a metal case is placed to cover the microwave circuit board 13, and this metal case is used to cover the dielectric resonator 11.
If it comes too close to the flat parts 1 1a and 1 1b, the Q value of the resonant circuit will decrease as in the case of the ground conductor 15 described above. Therefore, there is a problem in that it becomes difficult to reduce the height of the resonant circuit in combination with the necessity of using the support stand l2.

Therefore, in the present invention, when attaching a dielectric resonator to a microwave circuit board, manufacturing costs can be reduced by eliminating the need for a conventional support stand, and the manufacturing process can also be simplified. Moreover, the aim is to make it possible to reduce the height of the metal case that covers the microwave circuit board.

(Means for Solving the Problems) In order to achieve such an object, the dielectric resonator fixing structure of the present invention includes a dielectric resonator, a microwave circuit board, and a microstrip line, The dielectric resonator is a TE. It resonates in lδ mode,
and a flat portion that faces each other, and an outer circumferential portion that connects the flat portions, and a flat portion is formed on at least a portion of the outer circumferential portion along an axial direction that passes through the opposing flat portions. An electrode film is formed on the flat part, and the microwave circuit board is made of a dielectric material, and a microstrip line is formed on one side and a ground conductor on the other side. The dielectric resonator is magnetically coupled to a body resonator, and the opposing plane parts of the dielectric resonator do not face the one surface of the microwave circuit board, and the axis passing through both plane parts is a microstrip line. and the dielectric resonator is also directly attached to the one surface of the microwave circuit board with the flat part on which the electrode film is formed facing upward. It is characterized by

(Function) In the dielectric resonator, the opposing plane parts do not face one side of the microwave circuit board, and the axis passing through the opposing plane parts is in a direction that intersects the microstrip line. Even if the dielectric resonator is brought close to the microwave circuit board, the magnetic flux in contact with the ground conductor does not increase as in the conventional case. Therefore, a resonant circuit can be formed without significantly lowering the Q value, and the dielectric resonator can be directly attached to the microwave circuit board without using a conventional support.

In addition, the dielectric resonator has a flat part formed on at least a part of its outer periphery, an electrode film is formed on this flat part, and the flat part on which the electrode film is formed is directed upward to generate microwave radiation. Since it is attached to the circuit board, almost no magnetic flux is formed in the upper part of the flat part.

Therefore, even if the metal case is brought close to the dielectric resonator, the Q value does not decrease much, and as a result, a supporting stand is not required, and the height of the metal case can be reduced.

In addition, since an electrode film is formed on the flat part of the outer periphery of the dielectric resonator, the dielectric resonator has a dielectric material that is symmetrical in shape to the lower part even in the upper part of the electrode film. Therefore, the characteristics of the dielectric resonator do not pose any practical problems.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to FIGS. 1 and 2.

In these figures, the dielectric resonator 1 resonates in the TE01δ mode, and has opposing planar parts 1a.
1b and an outer peripheral part 1c connecting the flat parts 1a and 1b, and a flat part 1d is formed in a part of the outer peripheral part 1c. That is, this dielectric resonator 1 has a flat cylinder 1 1a in which the conventional example has a perfect cylindrical shape facing each other.
, f Ib, and has the shape of a semi-cylindrical column 7 cut exactly in half along the axial direction, and an electrode film 1e is formed on a flat portion 1d corresponding to the cut surface.

In this dielectric resonator 1, one flat part 1a faces toward the microstrip line 3 on the microwave circuit board 2, and the outer peripheral part 1c faces upward with the flat part 1d on which the electrode film 1e is formed. It is fixed to the vicinity of the microstrip line 3 on the microwave circuit board 2 with a suitable adhesive.

The microwave circuit board 2 has the same configuration as the conventional one, and has a ground conductor 4 formed on its lower surface.

In the dielectric resonator fixing structure of the present invention having such a configuration, a magnetic field is formed in the axial direction through the planar portions 1a and 1b of the dielectric resonator l. The magnetic flux F forming this magnetic field interlinks with the microstrip line 3 as shown in FIG.

In this case, the planes 1a and 1b are the microwave circuit boards 2
Since the dielectric resonator 1 does not face the surface, even if the dielectric resonator 1 is close to the microwave circuit board 2, the Q value of the resonant circuit does not decrease much.

81 Furthermore, since the dielectric resonator 1 has a semi-cylindrical shape and the flat part 1d on which the electrode film 1e is formed faces upward, most of the magnetic flux is formed in the upper part of the flat part 1d. Therefore, even if the metal case that covers the microwave circuit board is brought closer to the dielectric resonator I, the Q value does not decrease much. This eliminates the need for a conventional support stand and allows the metal case to have a lower profile.

Although the dielectric resonator 1 has a semi-cylindrical shape and is only half the size of the conventional one, due to the existence of the electrode film 1e, it appears as if there is a dielectric material in the upper part of the electrode film 1e and the lower part. Therefore, these characteristics do not pose a practical problem.

In this way, the dielectric resonator 1 is magnetically coupled to the microstrip line 3 to form a resonant circuit. Therefore, by adjusting the distance Q between the dielectric resonator 1 and the microstrip line 3 in the same manner as in the prior art, the degree of coupling between the two is adjusted, and as a result, the characteristics of the resonant circuit are adjusted.

Note that the dielectric resonator l may be arranged obliquely at an angle θ with respect to the microstrip line 3, as shown in FIG. In short, the plane parts 1a and 1b of the dielectric resonator 1 do not face the surface of the microwave circuit board 2, and the direction in which the axis passing through the opposing plane parts 1a and 1b intersects the microstrip line 3. By arranging the dielectric resonator l between the two, magnetic coupling between the two can be maintained. When the dielectric resonator l is arranged obliquely in this way, the characteristics of the resonant circuit can also be adjusted by adjusting the angle θ.

Further, the dielectric resonator 1 does not necessarily have to have a semi-cylindrical outer shape as in the above embodiment, but may have other shapes such as a prismatic shape as long as a flat part is formed on at least a part of the outer periphery. It may be. In short, a dielectric resonator of the required shape is cut into a shape that is essentially half in size along the axial direction passing through the opposing plane parts, and the cut surface is It is sufficient to form an electrode film on the corresponding part of the outer periphery, ie, the flat surface l1. Furthermore, the dielectric resonator 1 may be arranged so as to overlap the microstrip line 3.

(Effects of the Invention) As is clear from the above explanation, according to the present invention,
Since the dielectric resonator's flat part does not face the surface of the microwave circuit board and the dielectric resonator is arranged in a direction in which the axis passing through the opposing flat parts intersects the microstrip line, the dielectric resonator It is now possible to directly attach the resonator to the microwave circuit board, eliminating the need for a conventional support stand, reducing manufacturing costs and simplifying the work process.

In addition, the dielectric resonator has a flat part formed on at least a part of its outer periphery, an electrode film is formed on this flat part, and the flat part on which the electrode film is formed is directed upward to generate microwave radiation. Since it is attached to the circuit board, the metal case that covers the microwave circuit board can be brought closer to the dielectric resonator, making it possible to reduce the height of the metal case.

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[Brief explanation of drawings]

1 to 3 relate to an embodiment of the present invention, in which FIG. 1 is a perspective view of a main part of a microwave circuit board showing a fixing structure of a dielectric resonator of the same embodiment, and FIG. 2 is a side view thereof. , FIG. 3 is a plan view of a main part of a microwave circuit board showing a fixing structure for a dielectric resonator according to another embodiment of the present invention. 4 and 5 relate to a conventional example. FIG. 4 is a perspective view of a main part of a microwave circuit board showing a fixing structure of a dielectric resonator, and FIG. 5 is a side view thereof. 1... Dielectric resonator, 2... Microwave circuit board,
3... Microstrip line, 4... Earth conductor.

Claims (1)

[Claims] (1) Dielectric resonator (1), microwave circuit board (2)
, and a microstrip line (3), the dielectric resonator (1) resonates in the TE_0_1δ mode, and has opposing plane parts (1a, 1b),
And the outer peripheral part (1a, 1b) connecting those plane parts (1a, 1b)
1c), and a flat part (1d) is formed in at least a part of the outer peripheral part (1c) along the axial direction passing through the opposing flat parts (1a, 1b). An electrode film (1e) is formed on the part (1d), and the microwave circuit board (2) is made of a dielectric material, and has a microstrip line (3) on one side and a ground conductor (4) on the other side. ) are formed respectively, and the microstrip line (3) is a dielectric resonator (1).
The dielectric resonator (1) has opposing planar parts (1a, 1b
) does not face the one surface of the microwave circuit board (2),
In addition, the axis passing through both plane parts (1a, 1b) is arranged in a direction that intersects the microstrip line (3), and the dielectric resonator (1) is arranged in such a way that the electrode film (1)
A fixing structure for a dielectric resonator, characterized in that it is directly attached to the one surface of the microwave circuit board (2) with the flat portion (1d) formed in e) facing upward.