JP2677276B2 - Dielectric TEM resonator - Google Patents

Description

DETAILED DESCRIPTION [Overview] Dielectrics used in filters and oscillator circuits of wireless devices
Regarding a TEM resonator, an object thereof is to provide a dielectric TEM resonator which can be easily adjusted and whose resonance frequency can be changed in any direction. An outer conductor and an inner conductor respectively provided on the surface, and a first conductor pattern joined to the outer conductor provided on the surface of a substrate on which a dielectric body provided with the outer conductor and the inner conductor is mounted, A dielectric having a ground conductor pattern provided on the back surface of the substrate
In the TEM resonator, a first exposed portion is provided in a part of a surface of the outer conductor joined to the first conductor pattern and in the vicinity of one end surface of the dielectric, and the first and second exposed portions are provided. At positions corresponding to the first exposed portion of the conductor pattern of
And a third exposed portion is provided, and the first conductor plate is joined to the second conductor pattern at a position that covers a part of the third exposed portion.

[Industrial applications]

The present invention relates to a dielectric TEM resonator used for a filter of a wireless device, a generating circuit, and the like.

Dielectric TEM resonator is a few hundred MHz as a small and inexpensive resonator
It is used for circuits in the band of several GHz, but its resonance frequency is determined by the effective length of the resonator, so it is necessary to perform some fine tuning of the frequency after mounting on the circuit. The present invention refers to a dielectric TEM resonator whose frequency can be easily adjusted.

[Conventional technology]

7 to 9 show examples in which a dielectric TEM resonator is mounted on a substrate. FIG. 7 is a perspective view, FIG. 8 is a cross-sectional view of a λg / 2 type TEM resonator, and FIG. 9 is a λg / 4 type TE.
FIG. 6 is a cross-sectional view of an M resonator.

The outer conductor 10 and inner conductor are formed on the dielectric 12 by conductor metallization.
11 is provided, and the inner conductor 11 is connected to the conductor pattern 16 on the dielectric substrate 18 by the lead-out portion 14. 30 is a conductor pattern provided for stabilization, on which the outer conductor is
10 are joined.

In the case of λg / 2 type, the outer conductor 10 and the inner conductor 11 are separated as shown in FIG.
In the case of λg / 4 type, as shown in FIG.
The outer conductor 10 and the inner conductor 11 are connected by the conductor metallization applied to the surface opposite to the surface provided with, and the portion indicated by B becomes an open end.

In either case, the resonance frequency of the resonator is determined by the length in the major axis direction. However, in general, the dimensional accuracy of the dielectric is not sufficient, and since the subtle difference in the shape of the lead portion 14 greatly affects the resonance frequency, the resonance frequency is adjusted for each device after mounting the resonator on the substrate. There is a need.

FIG. 10 and FIG. 11 are diagrams for explaining a conventional resonance frequency adjusting method. As shown in the figure, the co-frequency of the dielectric resonator is made low, that is, long, and after mounting, if it is a λg / 2 type, as shown by A'in FIG.
In the case of the / 4 type, as shown by B'in FIG. 11, the resonance frequency is adjusted by grinding the outer conductor at the open end of the resonator with a file or the like. By doing so, the electric line of force at the open end bends inward, the effective length of the resonator becomes short, and the resonance frequency rises.

[Problems to be solved by the invention]

Such work is not only complicated, but the resonance frequency can be changed only by a method of increasing the frequency, and if it is cut too much and the frequency becomes too high, it becomes impossible to adjust,
There is a problem that it becomes a defective product.

Therefore, an object of the present invention is to provide a dielectric TEM resonator which can be easily adjusted and whose resonance frequency can be changed in any direction.

[Means for solving the problem]

The dielectric TEM resonator of the present invention is a substrate on which a dielectric, an outer conductor and an inner conductor provided on the surface and an inner surface of the dielectric, and a dielectric provided with the outer conductor and the inner conductor are mounted. In a dielectric TEM resonator comprising a first conductor pattern provided on the front surface of and joined to the outer conductor, and a second conductor pattern provided on the back surface of the substrate,
A first exposed portion is provided in a part of a surface of the outer conductor joined to the first conductor pattern and near one end face of the dielectric, and the first exposed portion of the first and second conductor patterns is provided. Second and third exposed portions are provided at positions corresponding to the first exposed portions, and the first conductor plate is joined to the second conductor pattern at a position that covers a part of the third exposed portion. It is characterized by being provided.

Further, a fourth exposed portion is further provided in a part of a surface of the outer conductor joined to the first conductor pattern and in the vicinity of the other end surface of the dielectric, and the first and second conductors are provided. Fifth and sixth exposed portions are further provided at positions corresponding to the fourth exposed portion of the pattern, and a second conductor plate is provided at a position that covers a part of the sixth exposed portion. It is also preferable that the pattern is joined to the pattern and further provided.

(Operation)

After mounting the dielectric resonator on the substrate, the resonance frequency can be adjusted in either direction by changing the position of the first moving body plate and changing the area covering the third exposed portion. Is.

When the adjustment by the first conductor plate alone does not provide a sufficient variable range, a second conductor plate or the like may be further provided, and the adjustment by the second conductor plate may be used in combination to further expand the variable range.

〔Example〕

1 to 3 are views showing a first embodiment of a dielectric TEM resonator according to the present invention. FIG. 1 is an exploded perspective view seen from the back surface side of a substrate 18, and FIG. 3 is a cross-sectional view when viewed from the direction of FIG. 7. The same components as those in FIGS. 7 to 9 are designated by the same reference numerals and the description thereof will be omitted.

The dielectric substrate 18 having the conductor pattern 20 on the front surface is also provided with the conductor pattern 22 almost all over the back surface thereof, and the conductor patterns 20 and 22 are provided with a large number of through holes 24.
It is connected with and becomes a ground pattern. Surface conductor pattern
Although not shown, a circuit including this dielectric resonator is provided in a portion without 20. For example, a dielectric resonator
When used for stabilizing the oscillation frequency of a VCO (voltage controlled oscillator), other circuit elements and wiring patterns of the VCO are provided.

Part of the surface of the dielectric 12 joined to the conductor pattern 20 is provided with a portion 36 where the outer conductor 10 is absent and the dielectric 12 is exposed in the vicinity of the end surface opposite to the end surface having the lead-out portion 14. ing. The conductor patterns 20 and 22 are also provided with exposed portions 30 and 32 at positions corresponding to the exposed portions 36.

Further, a copper foil 34 is joined to the conductor pattern 22 so as to cover a part of the exposed portion 32. The resonance frequency is adjusted by moving the joining position of the copper foil 34. That is,
When the bonding position of the copper foil 34 is moved so as to reduce the exposed area of the exposed portion 32, the effective length of the resonator becomes longer and the co-frequency becomes lower. On the contrary, when the movement is performed so as to increase the exposed area, the resonance frequency becomes higher. The copper foil 34 and the conductor pattern 22 are preferably joined by soldering, and the solder is melted to move the joining position.

FIGS. 4 to 6 are views showing a second embodiment of the present invention. Similar to FIGS. 1 to 3, FIGS. 4 and 5 are exploded perspective views and FIG. 6 is a cross section. It is a figure.

In this embodiment, as shown in the figure, an exposed portion 46 is provided on the opposite side of the exposed portion 36, and the conductor patterns 20 and 22 are provided with exposed portions 40 and 42 at positions corresponding thereto. Further, a copper foil 44 for frequency adjustment is formed so as to cover a part of the exposed portion 42.
Are joined to the conductor pattern 22. This configuration is copper foil
This is effective when the variable range of the resonance frequency is not sufficient only by moving 34.

〔The invention's effect〕

As described above, according to the present invention, there is provided a dielectric TEM resonator in which the resonance frequency can be easily adjusted in both directions of increasing and decreasing.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of the first embodiment of the present invention seen from the direction of the back surface, FIG. 2 is an exploded perspective view of the first embodiment of the present invention seen from another direction, and FIG. FIG. 4 is a cross-sectional view of the first embodiment of the present invention, FIG. 4 is an exploded perspective view of the second embodiment of the present invention as seen from the direction of the back surface, and FIG. 5 is another of the second embodiment of the present invention. 6 is a sectional view of a second embodiment of the present invention, FIG. 7 is a perspective view showing a conventional dielectric TEM resonator, and FIG. 8 is a conventional λg / 2 type. FIG. 9 is a sectional view of a dielectric TEM resonator, FIG. 9 is a sectional view of a conventional λg / 4 type dielectric TEM resonator, and FIGS. 10 and 11 are diagrams showing a conventional non-oscillation frequency adjusting method. In the figure, 10 ... outer conductor, 11 ... inner conductor, 12 ... dielectric, 14 ... drawing part, 16,20,22 ... conductor pattern, 18 ... dielectric substrate, 30,32,36, 42 …… Exposed part, 34,44 …… Conductor plate.

Claims (2)

(57) [Claims] 1. A dielectric material, an outer conductor and an inner conductor provided on the surface and an inner surface of the dielectric material, and a surface of a substrate on which the dielectric material having the outer conductor and the inner conductor is mounted. In a dielectric TEM resonator comprising a first conductor pattern joined to the outer conductor and a second conductor pattern provided on the back surface of the substrate, the first conductor pattern of the outer conductor A first exposed portion is provided in the vicinity of one end surface of the dielectric, which is a part of the surfaces to be joined, and the first exposed portion is provided at a position corresponding to the first exposed portion of the first and second conductor patterns, respectively. A dielectric TEM characterized in that second and third exposed portions are provided, and a first conductor plate is joined to the second conductor pattern at a position that covers a part of the third exposed portion. Resonator. 2. A fourth exposed portion is further provided in a part of a surface of the outer conductor joined to the first conductor pattern and in the vicinity of the other end surface of the dielectric body. Fifth and sixth exposed portions are further provided at positions corresponding to the fourth exposed portion of the second conductor pattern, and a second conductor plate is provided at a position that covers a part of the sixth exposed portion. The dielectric TEM resonator according to claim 1, further provided by being joined to the second conductor pattern.