JPS60230703A - Composite type coaxial resonator - Google Patents

Abstract

PURPOSE:To reduce number of parts and to save space by forming a dielectric coaxial resonator and cooperating passive element in a body utilizing an inductor of the dielectric resonator. CONSTITUTION:A hole 20 of rectangular sectional form extending in axial direction is formed in the inductor 12. Metallic plates 22, 24 are attached to each of opposite inner walls of the hole 20. Capacitance is formed between an inner conductor 16 and the inductor 12 between the metallic plate 22. The capacitance acts as a coupling capacitor C. On the other hand, separate capacitance is formed between an outer conductor 18 and the inductor 12 between the metallic plate 24. This capacitance acts as a parallel capacitance C1. The capacitance can be adjusted by area and position of insertion of metallic plates 22, 24. Accordingly, number of parts can be reduced and the space can be saved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to complex axial resonators, and more particularly to complex axial resonators comprising passive elements that cooperate with a TEM dielectric coaxial resonator to constitute, for example, an asymmetric trap. It is an axial resonator.

(Description of Prior Art) Signals in a specific frequency range are attenuated by connecting a resonant line between the hot side and the cold side of the signal transmission line to generate series resonance at a specific frequency, as shown in Figure 1. There are known trap circuits that allow As shown in FIG. 1, a trap in which the attenuation mode on both sides of the trap frequency is the same is called a symmetrical trap. On the other hand, the second
As shown in the figure, for example, a trap in which there is an anti-resonance point at a frequency higher than the trap frequency so that the attenuation modes on both sides of the trap frequency are different is called an asymmetric trap. Such an asymmetric trap is used when there is a frequency region in the vicinity of the trap frequency that is not desired to be attenuated or trapped.

However, for example, a third device using a dielectric coaxial resonator
In an asymmetric trap consisting only of a coupling capacitor C and a dielectric resonator R as shown in the figure, its anti-resonance frequency cannot be set freely. That is, in the asymmetric trap shown in FIG. 3, when the resonance frequency and coupling of the trap are designed or determined, the anti-resonance frequency is also uniquely determined accordingly. Therefore, if the automatically determined frequency signal is passed to the subsequent circuit (if not, then such an anti-resonant frequency must be shifted, for example, the hotline HL as shown in Figure 4) An inductance L may be connected between the hot line HL and the cold line CL, or another capacitor or capacitance C1 may be connected between the hot line HL and the cold line CL as shown in FIG. When parallel admittance elements such as inductance and capacitance are constructed from discrete components, not only the number of components increases, but also space is required.

(Objective of the Invention) Therefore, an object of the present invention is to provide a composite coaxial resonator that can reduce the number of parts and save space by integrally incorporating a passive element that cooperates with a dielectric resonator. It is to provide.

SUMMARY OF THE INVENTION Briefly, the present invention cooperates with a dielectric coaxial resonator by utilizing the solid dielectric of the dielectric coaxial resonator, e.g., as a dielectric or simply as a mounting part. This is a composite coaxial resonator that integrates passive elements.

The above objectives and other objective features of the invention will become more apparent from the following detailed description with reference to the drawings.

(Explanation of Embodiment) FIGS. 6 and 7 are diagrams showing an embodiment of the present invention. FIG. 6 shows a plan view thereof, and FIG.
A cross-sectional view at −■ is shown. The composite coaxial resonator 10 is
It includes a hollow cylindrical solid dielectric 12. Note that the dielectric 12
The shape is not limited to a cylinder, but may be a hollow rectangular tube. An inner conductor 16 is formed on the inner wall of the hollow portion of the hollow cylindrical dielectric 12, and an outer conductor 18 is formed on the side surface of the dielectric 12. The coaxial resonator in which the dielectric I2 is filled between the inner conductor 16 and the outer conductor 18 in this manner is already well known as a TEM dielectric coaxial resonator.

A hole 20 having a rectangular cross section and extending in the axial direction is formed in the dielectric 12 from one axial end thereof. This dielectric resonator 1
0 is constructed as, for example, of λ/4, such a hole 2o would be provided from the open end side. However, the dielectric resonator 10 may also be of λ/2. Dielectric material 12 in hole 2o formed as described above
Metal plates 22 and 24 are inserted and attached to each of two inner walls facing each other in the radial direction. The metal plates 22 and 24 are attached, for example, by pasting. Then, these two metal plates 22 and 24 are commonly connected to the hot line HL, and the outer conductor 18 is connected to the hot line HL.
Connect to cold line CL.

In this embodiment, the dielectric 12 between the inner conductor 16 and the metal plate 22 forms a capacitance therebetween. The capacitance between the inner conductor 16 and the metal plate 22 acts as a coupling capacitor C in FIG. 5, for example. On the other hand, another capacitance is formed between the outer conductor 18 and the metal plate 24 due to the effect of the dielectric 12 existing between them. This outer conductor 18 and metal plate 2
A further capacitance formed by 4 and 4 serves, for example, as parallel capacitance c1 in FIG.

These capacitances can be arbitrarily adjusted depending on the shape, area, insertion position, etc. of the metal plates 22 and 24.

Since both of the two capacitances are formed within the dielectric 12, that is, within the outer conductor 18, radiation loss of electromagnetic waves is small. That is, the integrated capacitance is shielded by the outer conductor 18 of the coaxial resonator and the dielectric 1 having a dielectric constant greater than that of air.
2, the radiation or leakage of electromagnetic waves from there is suppressed.

8 and 9 show a modification of the previous embodiment, and FIG.
The figure is a plan view thereof, and Figure 9 is the line IX-IX in Figure 8.
A cross-sectional view is shown. In this embodiment, one conductor 23 is inserted into the dielectric 12 and extends in the axial direction from the open end side. This conductor 23 is then connected to the real line HL. In this embodiment, the conductor 23 and the inner conductor 16
A capacitance corresponding to the coupling capacitor C in FIG. 5 is formed between the conductor 23 and the outer conductor 18, and a capacitance corresponding to the parallel capacitance C1 in FIG. 5 is formed between the conductor 23 and the outer conductor 18.

10 and 11 show other embodiments of the present invention, FIG. 10 is a plan view, and FIG. 11 is a line X in FIG. 10.
It is a sectional view taken along I-XI.

This embodiment constitutes an asymmetric trap having a circuit configuration as shown in FIG. A slit or groove 26 is formed on the outer surface of the dielectric 12, and a metal plate 28 is attached thereto. One end of this metal plate 28 is connected to the outer conductor 18, and the other end is connected to the hot line HL. At the same time, a hole is formed in the dielectric 12 extending from the open end in the axial direction thereof,
A metal plate 30 is inserted into the hole. This metal plate 30 is connected at one end to the hotline HL.

In this embodiment, a metal plate 28 formed within the groove 26
acts mainly as an inductance (FIG. 4) between it and the outer conductor 18, that is, the cold line CL.

The capacitance formed by the inner conductor 16 and the metal plate 3o acts as a coupling capacitor C in FIG.

The inductance can be adjusted arbitrarily by changing the shape and length of the metal plate 28, and the capacitance can be adjusted by changing the shape, area, or position of the metal plate 30.

As shown in Figures 10 and 11, the inductance L
In order to incorporate this, the other end (the one closer to the ground side) of the metal plate 24 shown in FIGS. 6 and 7 may be connected to the outer conductor 18.

For this purpose, the metal plate 24 (FIGS. 6 and 7) may be extended to the short-circuit end and connected to the cold line.

As shown in FIGS. 10 and 11, if a notch or groove 26 is formed and an electrode or metal plate 28 is formed therein, a distributed capacitance is formed between the outer conductor 18 and the metal plate 28. Not done. This is because there is no ground electrode facing the main surface of the metal plate 28. Therefore, the design and adjustment are easier than in the case where the inductance is formed by connecting the metal plate 24 to the outer conductor 18 as shown in FIGS. 6 and 7.

12, 13 and 14 show other embodiments of the present invention, of which FIG. 12 is a plan view and FIG.
The figure is its bottom view, and Figure 14 is the line XII in Figure 12.
It is a sectional view at -XIV.

In this embodiment, a hole 32 is formed in dielectric 12 that extends from an open end to a shorted end. Then, an electrode 34 is formed on the inner wall of the hole 32, extending in the axial direction from the shorted end side. One end of this electrode 34 is connected to the outer conductor 18, and the other end is connected to the hot line HL. The inner conductor 16 is also connected to the hotline HL via a coupling capacitor C. In this embodiment as well, the electrode 34 mainly functions as an inductance L (Fig. 84). By appropriately selecting the shape, size, length, etc. of this electrode 34, the inductance can be adjusted as desired.

In addition, in the above-mentioned embodiment, the metal plates 22, 24 (Fig. 6,
Figure 7) and 28.30 (Figures 10 and 11)
For the conductors 23 (FIGS. 8 and 9), separate metal plates may be used, but when forming the inner conductor and outer conductor, the same material may be used, for example, by plating, printing, baking, or vapor deposition. Of course, it may be formed as a film that is

Furthermore, it is also possible to easily combine the several embodiments described above as appropriate.

(Effects of the Invention) As described above, according to the present invention, the passive element that cooperates with the dielectric coaxial resonator is integrally formed using the dielectric of the dielectric resonator. There is no need to use a , the number of parts can be reduced, and space can be saved.

[Brief explanation of the drawing]

FIG. 1 is a graph showing an example of a frequency-attenuation curve of a symmetrical trap. FIG. 2 is a graph showing an example of a frequency-attenuation curve of an asymmetric trap. FIG. 3 is a circuit diagram showing an asymmetric trap in which the anti-resonance frequency cannot be adjusted. FIGS. 4 and 5 are circuit diagrams illustrating examples of asymmetric traps with adjustable anti-resonance frequencies, respectively. FIG. 6 and FIG. 7 show an embodiment of the present invention, and FIG.
The figure is a plan view thereof, and FIG. 7 is a sectional view taken along the line ■--■ in FIG. 6. 8 and 9 show a modification of the previous embodiment, and FIG.
The figure is a plan view thereof, and Figure 9 is the line IX-IX in Figure 8.
FIG. 10 and 11 show another embodiment of the invention, FIG. 10 being a plan view thereof, and FIG. 11 being a sectional view taken along line XI--XI in FIG. 10. 12, 13 and 14 show other embodiments of the present invention, of which FIG. 12 is a plan view and FIG.
The figure is its bottom view, and Figure 14 is taken along line XIV in Figure 12.
It is a sectional view at -XIV. In the figure, C is a coupling capacitor, L is a parallel inductance, C1 is a parallel capacitance, 10 is a composite axial resonator, 12 is a dielectric, 22, 24, 28, 30 are metal plates, 23 is a conductor, and 34 is an electrode. shows. Patent applicant Murata Manufacturing Co., Ltd. Representative Patent attorney Oka 1) Zen Kei (1 idiot) Figure 8 1m Figure 9 10 Figure 4 218 11

Claims (1)

[Scope of Claims] 1. A dielectric coaxial resonator having a solid dielectric between an inner conductor and an outer conductor, the passive conductor to be connected between two wires to which the inner conductor and outer conductor are connected. A composite quantum-axis resonator in which an element is formed using the solid dielectric material. 2. Claim 1, further comprising a conductor formed within the solid dielectric, wherein the passive element includes a capacitor, and the capacitor is formed between the conductor and at least one of the inner conductor and the outer conductor. Composite mass-axis resonator as described in Section 1. 3. A conductive part formed on the solid dielectric and one end of which is connected to the external conductor, wherein the passive element includes an inductance, and the inductance is formed by the conductive part. Alternatively, the composite quantitative axis resonator according to item 2.