Cavity filter, radio-frequency zooming-out equipment, signal receiving-transmitting device and tower top amplifier

Abstract

The invention discloses a cavity filter, and radio-frequency zooming-out equipment, a signal receiving-transmitting device and a tower top amplifier comprising the cavity filter. The cavity filter provided by the invention comprises a cavity and a resonant rod in the cavity, wherein the outer surface of the resonant rod is provided with a coupling body; an insulating medium layer is formed between the coupling body and the resonant rod; and the coupling body is provided with a connecting piece for transmitting signals. The cavity filter provided by the invention has the dual functions of coupling signals and resisting lightning, is simple in structure, has a larger coupling amount, and contributes to comparatively improving the cavity space arrangement.

Description

technical field [0001] The invention relates to the field of communication radio frequency, and mainly relates to a cavity filter, radio remote equipment including the cavity filter, a signal transceiver and a tower top amplifier. Background technique [0002] As a frequency selection device, filters are widely used in the field of communication, especially in the field of radio frequency communication. In the base station, the filter is used to select the communication signal and filter out the clutter or interference signal outside the frequency of the communication signal. [0003] In cavity filters with lightning protection requirements, structural capacitors are usually added to the connectors of the filter. The so-called structural capacitors replace capacitive components with a specific form of mechanical structure to play the same role as capacitive components. role, such as figure 1 As shown, the existing structural capacitor 100 includes two rods and an insulatin...

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Problems solved by technology

[0005] The inventors of the present invention have found that the structure of the structural capacitor in the prior art needs to add a section of space to accommodate the structural capacitor in the filter, and the greater the coupling amount is, the longer the structural capacitor needs to be, and the occupied filter area is larger. Big

[0006] In the way of coupling signals by the coupling plate, due to the limited coupling area of ​​the coupling plate, the coupling amount is limited; and one end of the coupling plate needs to be fixed on the inner conductor of the connector through a connector, and the other end needs to face the resonant rod, which is directional. Requirements, position changes are small, and the cavity space is small, the cavity discharge has great limitations; in addition, the distance between the coupling plate and the resonant rod will change with temperature, which will affect the coupling amount and lead to changes in radio frequency parameters. poor consistency

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