JPH011312A - ring resonator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a ring-shaped resonator used in filters or oscillators of various wireless communication devices, measuring instruments, etc.

Background of the Invention In recent years, high frequency resonators have been developed in a variety of ways as filters, oscillators, and other equipment are required to be smaller and lower in cost. A split ring resonator is known as a resonator having high Q characteristics, and is disclosed, for example, in Japanese Patent Publication No. 54-42574.

Hereinafter, a conventional ring-shaped resonator will be explained with reference to FIG.

Figures 2 (A) and (B) show ring-shaped resonance when both end faces of a cylindrical ring-shaped dielectric are metallized, one end face is used as a ground conductor, and the other end face is used as a resonant line conductor with both ends open. This is the basic structure of the vessel. In FIGS. 2(A) and (B), 101 is a cylindrical ring-shaped dielectric, 102 is a ground conductor metallized on one end surface of the dielectric 101, and 103
is a resonant line conductor metallized on the other end face, 104 is a resonant frequency tuning capacitor connected in series to both open ends of the notch of the resonant line conductor 103, and 105 is near one open end of the resonant line conductor 103 (: connected It is the input/output coupling capacitance.

Each capacity 104 is based on the basic structure of Fig. 2 (A) and (B).
, 105 are composed of parallel plate capacitors 106 made of ceramic or the like. An example of a conventional cylindrical ring resonator is shown in FIG.
Shown in D). 107 is an electrode forming a capacitor, and 110 is a substrate fixed in contact with the ground conductor 102. information ffi
104 is a parallel plate capacitor in which electrodes are metallized on the entire upper surface of a substrate such as a ceramic substrate and on both end surfaces of the lower surface, and the capacity 1 is 2.
They are connected in series to a resonant line. Similarly, the capacitor 105 is a parallel plate capacitor in which the upper and lower surfaces (two electrodes) of the ceramic substrate are metallized.

Reference numeral 109 denotes an electrode trimming section, which makes it possible to adjust the resonance frequency and input/output coupling degree of the cylindrical ring-shaped resonator by trimming each capacitor 104 and 105 with a laser or the like.

Problems to be Solved by the Invention The ring-shaped resonator described above is small and has a high Q, and it is easy to adjust the resonant frequency and the degree of coupling with external circuits by laser trimming the capacitance while mounted in the housing. It has the feature that it can be done. However, the capacitors 104 and 105 mounted on the resonant line need to be fixed with high positional accuracy, but conventionally two capacitors t'a 104 and 105 for resonance frequency tuning and input/output coupling have been separately installed. Although they are fixed with solder welding or conductive adhesive, etc., the positioning accuracy of the two capacitors 104 and 105 is poor, and due to hanging or the amount of adhesive, the input/output coupling capacitor with a small adhesive area may come off. , there were problems such as deterioration of no-load Q.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide a ring-shaped resonator having a capacitance with a structure that does not impair the above-mentioned features.

Means for Solving the Problems The present invention replaces two capacitors mounted in a cylindrical ring resonator with a parallel plate capacitor of integrated structure.

By using the above-mentioned configuration, the present invention reduces the number of parts of the capacitor attached to the ring resonator, allows the capacitor to be easily fixed with C adhesive, and improves the positioning accuracy of the two capacitors. be.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

Figures 1 (A), (B), and (C) are top and side views showing a capacitor that integrates a resonant frequency tuning capacitor and an input/output coupling capacitor, which are the main parts of a ring resonator in an embodiment of the present invention. ,
and a bottom view. 106 is a parallel plate capacitor made of ceramic or the like, 107 is a capacitor forming electrode, 104 is a resonance frequency tuning capacitor part, 105 is an input/output coupling capacitor part,
Reference numeral 108 indicates a non-electrode portion on the upper surface of the parallel plate capacitor.

As shown in the figure, a non-electrode portion 108 is provided, and a capacitance forming electrode 1 is provided.
By separating 07, each capacity 104.105 becomes 1
coexist within parallel plate capacities, i.e., each capacity 104.1
This makes it possible to integrate the 05.

FIGS. 1(D) and 1(E) are a plan view and a sectional view of a ring-shaped resonator according to an embodiment of the present invention.

That is, the parallel plate capacitance 1 shown in FIGS. 1(A) to (C)
06 is shown mounted on both open ends, which are cutouts, of a resonant line conductor 103 of a cylindrical ring-shaped resonator.

According to the above configuration, in the cylindrical ring resonator,
A structure in which the resonance frequency adjustment 1104 and the input/output coupling capacitance 1OS are integrated can be realized. Furthermore, Figure 1 (
As shown in D) and (E), the resonant frequency and the degree of input/output coupling can be adjusted by trimming the electrodes using a laser or the like in the electrode trimming section 109.

Although the ring-shaped resonator is shown as having a cylindrical shape, it goes without saying that the shape is not limited to this, such as a rectangle or a triangle.

DETAILED DESCRIPTION OF THE INVENTION As described in detail, the present invention provides a ring-shaped resonator with two capacitors, that is, a resonant frequency tuning capacitor and an input/output coupling capacitor, by using a parallel plate capacitor having an integrated structure. This increases the mounting area, allows stable attachment, and improves the positioning accuracy between the two capacitors.

In addition, the number of parts has been reduced, resulting in smaller size and lower costs.
It becomes possible to simplify the work, and when using an oscillator or filter (when used in combination, productivity is improved), and its industrial value is extremely large.

[Brief explanation of drawings]

FIGS. 1A, 1B, and 1C are side sectional views of a resonance layer and a main part of a ring-shaped resonator according to an embodiment of the present invention. 101... Cylindrical ring dielectric, 102... Ground conductor, 103... Resonant line conductor, 104... Resonant frequency tuning capacitor, 105... Input/output coupling capacitor, 106...
・Parallel plate capacitance, 107...Capacitance forming electrode, 108・
. . . Non-electrode portion, 109 . . . Electrode trimming portion. Name of agent: Patent attorney Toshio Nakao (1st person)
figure

Claims (1)

[Claims] It has a transmission line such as a strip line or a microstrip line with both ends open, a resonant frequency tuning capacitor that connects both open ends of the transmission line, and an input/output coupling capacitor that connects to the transmission line. A ring-shaped resonator characterized in that the connected input and output coupling capacitors have an integrated structure using parallel plate capacitors.