KR101750764B1

KR101750764B1 - Frequency Tunable Resonator

Info

Publication number: KR101750764B1
Application number: KR1020150176740A
Authority: KR
Inventors: 박종철; 양승재; 정완수
Original assignee: (주)웨이브텍
Priority date: 2015-12-11
Filing date: 2015-12-11
Publication date: 2017-06-27
Also published as: WO2017099296A1; KR20170069488A

Abstract

A housing having one side open and a receiving space therein; A cover covering the open side of the housing; A resonance element accommodated in the housing space of the housing; A tuning screw passing through the cover and disposed on the resonance element; An insulator interposed between the cover and the tuning screw to prevent conductive contact between the tuning screw and the cover; And a capacitive element having a capacitance in conductive connection with the tuning screw at one terminal and a capacitance in conductive connection with the cover at the other terminal. The frequency tunable resonator according to the present invention further increases the amount of frequency tuning to be tuned by connecting an additional capacitive element in addition to the tuning screw for frequency tuning and further tunes the frequency by an external control signal, It can be done. In addition, the frequency tunable resonator of the present invention can further miniaturize the capacitance by forming an equivalent capacitor formed by the tuning screw and an additional capacitor for frequency tuning in series, thereby alleviating the tuning sensitivity of the high frequency filter I can do it. Further, the resonator of the present invention can realize weight reduction and miniaturization of the high-frequency filter.

Description

[0001] The present invention relates to a frequency tunable resonator,

The present invention relates to a frequency tunable resonator and a high-frequency filter including the tunable resonator. More particularly, the present invention relates to a frequency tunable resonator and a high-frequency filter including the capacitive element. And more particularly to a frequency tunable resonator capable of realizing more efficient frequency tuning and a high-frequency filter including the tunable resonator.

High-frequency filters (DR filter, cavity filter, waveguide filter, etc.) have a structure of a kind of circuit box for resonating high frequency, especially very high frequency. Generally, a resonant circuit by a coil and a capacitor is not suitable for forming a very high frequency because of a large radiation loss. The RF filter is composed of a plurality of resonators. Each resonator forms a cavity such as a metallic cylinder or a rectangular parallelepiped surrounded by a conductor and includes a resonance element formed of a dielectric resonance element (DR) or a metal resonance element in the cavity, So that resonance of a very high frequency can be realized.

Fig. 1 is a diagram showing a conventional resonator structure applied to a high-frequency filter, and Fig. 2 is an equivalent circuit for the resonator structure of Fig.

A conventional resonator 10 'includes a housing 100 having one side opened and a housing space formed therein. The open side of the housing 100 is covered by the cover 200. [ The resonance element 300 is accommodated in the housing space of the housing 100 and the tuning screw 400 is disposed on the resonance element 300 through the cover 200. The length of the tuning screw 400 entering the housing 100 and the cover 200 is adjusted, and the resonance frequency is tuned by adjusting the length.

However, the tuning structure of the resonance frequency by the tuning screw 400 in the conventional resonator 10 'has a physical limitation in the frequency tuning range due to the physical limitation of the tuning screw.

Patent Registration No. 10-0865727 (registered on October 22, 2008) discloses a resonator having multiple parallel capacitors, a cavity filter using the resonator, and a bandpass filter. According to the present invention, a plurality of receiving holes are provided in a resonating part of a resonator, and a plurality of tuning screws are inserted into the receiving hole, thereby enabling a plurality of capacitors to be connected in parallel in an equivalent circuit, . &Lt; / RTI >

Patent Registration No. 10-0918791 (registered on September 17, 2009) discloses a frequency tunable filter. According to the present invention, a sliding member having a metal tuning element coupled thereto is provided separately from a tuning screw so that frequency tuning is performed in accordance with the sliding of the sliding member.

The above-mentioned conventional technique is advantageous in that the resonance frequency tuning range is extended as compared with a conventional resonator having only one tuning screw, but it can be further improved. Accordingly, the present inventors have made efforts to develop a resonator that can perform frequency tuning more efficiently while further extending the frequency tuning range of the resonator, and as a result, the present invention has been achieved.

Therefore, it is an object of the present invention to provide a frequency tunable resonator that allows a frequency tuning range to be further extended and frequency tuning can be performed more efficiently than a conventional resonator that performs frequency tuning by one tuning screw, And to provide a high-frequency filter.

It is an object of the present invention to further miniaturize the capacitance by mounting an equivalent capacitor formed by a tuning screw and an additional capacitor for frequency tuning in series to enable finer tuning of the frequency, Frequency tunable resonator capable of mitigating the sensitivity and a high-frequency filter including the tunable resonator.

It is another object of the present invention to provide a frequency tunable resonator capable of realizing weight reduction and miniaturization of a high frequency filter, and a high frequency filter having a reduced weight and miniaturization.

According to an aspect of the present invention, there is provided a frequency tunable resonator comprising: a housing having one side open and a receiving space therein; A cover covering the open side of the housing; A resonance element accommodated in the housing space of the housing; A tuning screw passing through the cover and disposed on the resonance element; An insulator interposed between the cover and the tuning screw to prevent conductive contact between the tuning screw and the cover; And a capacitive element having a capacitance in a conductive connection with the tuning screw at one terminal and a conductive connection with the cover at the other terminal.

The capacitive element is preferably mounted on a PCB substrate disposed on the cover.

The conductive connection between the capacitive element and the cover is preferably formed by filling a via hole formed in the PCB substrate with a conductive material.

The capacitive element may be a plurality of varactor diodes or capacitors connected in parallel.

The plurality of capacitive elements connected in parallel may be selectively turned on to adjust the capacitance.

The capacitive element may be a variable capacitor.

The capacitance of the capacitive element is preferably controlled by a control signal transmitted from the outside of the PCB substrate.

The present invention also provides a high-frequency filter including the above-described frequency tunable resonator.

The frequency tunable resonator according to the present invention further increases the amount of frequency tuning to be tuned by connecting an additional capacitive element in addition to the tuning screw for frequency tuning and further tunes the frequency by an external control signal, It can be done. In addition, the frequency tunable resonator of the present invention can further miniaturize the capacitance by forming an equivalent capacitor formed by the tuning screw and an additional capacitor for frequency tuning in series, thereby alleviating the tuning sensitivity of the high frequency filter I can do it. Further, the resonator of the present invention can realize weight reduction and miniaturization of the high-frequency filter.

1 is a diagram showing a structure of a conventional resonator.
Fig. 2 is a diagram showing an equivalent circuit for the resonator of Fig.
3 is a diagram illustrating a structure of a frequency tunable resonator according to an embodiment of the present invention.
4 and 5 are diagrams showing an equivalent circuit for the resonator of Fig.

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail with reference to the drawings.

3 to 5, the frequency tunable resonator 10 of the present invention includes a housing 100, a cover 200, and a resonant element 300.

The housing 100 has one side opened and a housing space inside. In the form of the housing 100, it is preferable that the inside is hollow and has a rectangular parallelepiped shape with one open side, but it may have a different shape such as a cylindrical shape. FIG. 3 is a partial view showing a structure in which a rectangular parallelepiped-shaped housing is divided by barrier ribs, and each of the divided spaces forms one resonator. The cover 200 covers the opening face of the housing 100 and has the same shape as the opening face of the housing 100. Fig. 3 shows a part of the cover covering the entire housing divided by the partition wall. In the present invention, the housing 100 may be divided into partitions or may have a single shape. The cover 200 may cover the entire divided housing space of the housing 100 corresponding to the housing 100 or may cover the single housing space when the housing 100 has a single housing space good. Housing 100 and cover 200 may typically be formed of an electrically conductive material, particularly a metallic material, especially aluminum.

The resonance element 300 is accommodated in an inner space formed by the housing 100 and the cover 200 and is not particularly limited as long as it is applied to a cavity filter or a dielectric resonator filter. It can be sealed. The resonant element 300 typically forms a conductive connection directly or indirectly with the bottom surface of the housing 100 and may or may not form a conductive connection with the cover 200 depending on the type of the resonator. The resonant element 300 may have various shapes, for example, a cylindrical rod shape having a through hole in the center thereof, a polygonal tube shape, or the like.

The frequency tunable resonator 10 of the present invention also includes a tuning screw 400. The tuning screw 400 is typically provided for tuning the resonance frequency and is a structure for realizing a fundamental capacitance with low loss for high Q value and high power. 300). The cover 200 is formed with a through-hole through which the tuning screw 400 passes. As shown in FIG. 3, when the resonant element 300 has a hollow center, the tuning screw 400 is typically inserted in the hollow of the resonant element. The tuning screw 400 is fixed to the cover 200 by a fixing nut 410 after the frequency tuning is performed.

The frequency tunable resonator 10 of the present invention is not different from a conventional resonator in that it includes a housing 100, a cover 200, a resonant element 300 and a tuning screw 400. In a typical resonator, The tuning screw 400 in the frequency tunable resonator 10 of the present invention differs from a conventional resonator in that it does not make conductive contact with the cover 200. In contrast,

In order to prevent the tuning screw 400 from making conductive contact with the cover 200 in the frequency tunable resonator 10 of the present invention, an insulator 500 is introduced. The insulator 500 is made of an insulating material and is interposed between the cover 200 and the tuning screw 400 to prevent conductive contact between the cover 200 and the tuning screw 400. The insulator 500 may be formed in a structure such as a gasket.

The frequency tunable resonator 10 of the present invention further includes an additional capacitive element 600. The capacitive element 600 is preferably mounted on the PCB substrate 610. The PCB substrate 610 is disposed on the cover 200. The capacitive element 600 forms a conductive connection with the tuning screw 400 at one terminal and a conductive connection with the cover 200 at the other terminal. A via hole 612 is formed in the PCB substrate 610 so that the capacitive element 600 forms a conductive connection with the cover 200. The via hole 612 is filled with a conductive material.

4 and 5, the capacitive element 600 additionally installed in the frequency tunable resonator 10 of the present invention includes a tuning screw 400 and an equivalent capacitor 300 formed by the resonant element 300. [ Respectively.

The capacitive element 600 may be a variable capacitor, as shown in FIG. The capacitive element 600 may also be a plurality of varactor diodes or capacitors connected in parallel, as shown in FIG. The plurality of capacitive elements 600 connected in parallel may be selectively conducted so that the capacitance is adjusted. Selective conduction of a plurality of capacitively coupled devices in parallel may be performed by a switching device such as a pin diode and a transistor, especially a graphene-based transistor.

In the frequency tunable resonator 10 of the present invention, the capacitance of the capacitive element 600 may be configured to be controlled by a control signal transmitted from the outside of the PCB substrate 610. Since the technique of adjusting the capacitance by the external control signal belongs to the conventional technology, a detailed description will be omitted here.

The frequency tunable resonator 10 described above is applied to a high frequency filter and is formed by serially forming an equivalent capacitor and an additional capacitive element 600 formed by the tuning screw 400 and the resonant element 300, The tuning range can be greatly expanded. That is, one resonator can cover various operating frequency bands. In addition, in the case of a conventional resonator, in order to change the resonance frequency, the resonance frequency has to be changed by a physical method. However, the resonator of the present invention can change the capacitance by an external control signal or select a preset capacitance Frequency tuning can be performed quickly. Further, the capacitance realized by the resonator 10 can be further finely adjusted, thereby further improving the usability. The resonator (10) of the present invention also enables the weight reduction and miniaturization of the high frequency filter.

10: Resonator 100: Housing
200: cover 300: resonant element
400: tuning screw 410: fixing nut
500: Insulator 600: Capacitive element
610: PCB substrate 612: via hole

Claims

A housing having one side open and a receiving space therein; A cover covering the open side of the housing; A resonance element accommodated in the housing space of the housing; A tuning screw passing through the cover and disposed on the resonance element; An insulator interposed between the cover and the tuning screw to prevent conductive contact between the tuning screw and the cover; And a capacitive element having a capacitance in a conductive connection with the tuning screw at one terminal and a conductive connection with the cover at the other terminal,
Wherein the capacitive element is mounted on a PCB substrate disposed on the cover,
Wherein the conductive connection between the capacitive element and the cover is formed by filling a via hole formed in the PCB substrate with a conductive material.

delete

The method according to claim 1,
Wherein the capacitive element is a plurality of varactor diodes or capacitors connected in parallel.

5. The method of claim 4,
Wherein the plurality of capacitive elements connected in parallel are selectively turned on to adjust the capacitance.

The method according to claim 1,
Wherein the capacitive element is a variable capacitor.

The method according to claim 1,
Wherein capacitance of the capacitive element is controlled by a control signal transmitted from the outside of the PCB substrate.

A high-frequency filter comprising the frequency tunable resonator according to any one of claims 1 to 7.