CN201877552U

CN201877552U - Capacitance coupling radio frequency filter

Info

Publication number: CN201877552U
Application number: CN2010206394470U
Authority: CN
Inventors: 杨国胜; 孙跃; 胡英彪; 陶荣华; 黄伟
Original assignee: Anhui Htmicrowave Co Ltd
Current assignee: Anhui Htmicrowave Co Ltd
Priority date: 2010-12-02
Filing date: 2010-12-02
Publication date: 2011-06-22
Anticipated expiration: 2020-12-02

Abstract

The utility model discloses a capacitance coupling radio frequency filter. The capacitance coupling radio frequency filter is provided with a public first-stage resonant cavity, a first-stage resonant rod is arranged in the first-stage resonant cavity and is connected with a tap jumper wire, and the tap jumper wire 2 is connected with a connector in an air coupling way. The capacitance coupling radio frequency filter solves the problem that a band elimination filter can not be directly coupled with a cavity filter and can be used for taps with ultrahigh frequency or ultralow frequency and excessively wide or excessively narrow band width, wherein the taps can not be subjected to direct coupling, and the capacitance coupling radio frequency filter is favorable for dividing frequency range and manufacturing combined multiplexers.

Description

The capacitive coupling radio-frequency filter

Technical field:

The utility model relates to a kind of capacitive coupling radio-frequency filter, is applied to the moving communicating field product and (and comprises mobile TV 640-800MHz, FM frequency modulation 80-108MHz, TETRA806-866MHz, public security fire-fighting 351-366MHz, war products, civil aviaton's product etc.).

Background technology:

Radio-frequency filter as important microwave device in the microwave regime extensive use, because increasing of different frequency section in recent years, divide, relate to combination of band stop filter and cavity body filter and ultra-high frequency, ULF, the situation that bandwidth is wide or narrow, requirement to mixer is more and more higher, closed the road by former simple two frequencies, be increased to three frequently, four frequently even six multi-frequencies frequently or more, take original tap connected mode (to see Fig. 2 like this, each filter first order resonance rod 1 is welded to connect by tap wire jumper 2 and connector 3), not only be difficult to technically realize, and also suitable big of debugging difficulty.

Summary of the invention:

For overcoming the defective of prior art, the purpose of this utility model is to provide a kind of capacitive coupling radio-frequency filter, can solve the difficult problem that the direct coupling of combination of band stop filter and cavity body filter can't be satisfied, so also can use frequency superelevation, ultralow, the situation that tap such as bandwidth is wide, narrow adopts direct coupling to satisfy; Be beneficial to the division of frequency band, the making of combination multiplexer.

The utility model technical solution problem adopts following technical scheme:

Capacitive coupling radio-frequency filter, described filter have public first order resonant cavity, are provided with first order resonance rod in described first order resonant cavity, and described first order resonance rod is connected with the tap wire jumper, and tap wire jumper 2 is connected with connector by the Air Coupling mode.

Compared with the prior art, the beneficial effects of the utility model are embodied in:

The utility model adopts the tap wire jumper to be connected with the mode that connector carries out Air Coupling, helps the increase and the division of microwave regime frequency range; Realize ultra-high frequency, ULF, the wide or narrow microwave product of bandwidth, the tap coupling realizes oversimplifying.

Description of drawings:

Fig. 1 is a structural representation of the present utility model; Fig. 2 is existing Filter Structures schematic diagram.

Number in the figure: 1 first order resonance rod, 2 tap wire jumpers, 3 connectors, 4 first order resonant cavitys.

Below pass through embodiment, and the utility model is described in further detail in conjunction with the accompanying drawings.

Embodiment:

Embodiment: in conjunction with Fig. 1, the capacitive coupling radio-frequency filter of present embodiment, described filter has public first order resonant cavity 4, in described first order resonant cavity, be provided with first order resonance rod 1, described first order resonance rod is connected with tap wire jumper 2, and tap wire jumper 2 is connected with connector 3 by the Air Coupling mode.

Referring to Fig. 2, existing filter adopts tap wire jumper and the direct-coupled mode of connector, and wire jumper and connector directly are connected tap and were coupled and can cause first order resonant cavity inoperative by force, the inhibition variation; The utility model adopts the Air Coupling mode can avoid this type of situation, and it is better to suppress index; Structure is simple relatively, is easy to control; Also can solve frequency superelevation, ultralow, tap such as bandwidth is wide, narrow adopts directly coupling to be difficult for the situation of realization; Cavity body filter adopts the Air Coupling mode to merge with stopband and forms multiplexer in addition; Solve the problem that band resistance and multi-channel filter close the road difficulty, very big reduction cost, improved debugging efficiency; And because to have added band resistance mechanical structure in the multiplefrequency mixer simple relatively, intermodulation ratio is higher.

Claims

1. capacitive coupling radio-frequency filter, it is characterized in that described filter has public first order resonant cavity (4), in described first order resonant cavity, be provided with first order resonance rod (1), described first order resonance rod is connected with tap wire jumper (2), and tap wire jumper (2) is connected with connector (3) by the Air Coupling mode.