Broad tuning coaxial electrically tunable filter and debugging method thereof

Abstract

The invention discloses a broad tuning coaxial electrically tunable filter and a debugging method thereof, and relates to the technical field of microwave communication. The electrically tunable filter comprises a driving circuit, a stepping motor, a transmission mechanism and a filter part, wherein the filter part is provided with two coupling seats, a plurality of resonant cavities and a plurality of intercavity coupling structures; the coupling seats are fixedly equipped with trapezoidal coupling loops; adjustable frequency compensation devices are arranged on outer conductors of the resonant cavities; the intercavity coupling structures are metal plates with two or more circular holes or polygonal holes. The debugging method can allow the electrically tunable filter to reach a tuning range above an octave and have constant band width, stable amplitude frequency and echoing characteristics, improves product debugging efficiency and lowers manufacture and debugging costs.

Description

technical field [0001] The invention relates to a coaxial electric tuning filter and a debugging method thereof, in particular to a wide-tuning coaxial electric tuning filter and a debugging method thereof, belonging to the technical field of microwave filters in the communication field. Background technique [0002] In the prior art, the Chinese Utility Model Patent No. CN201220549062.4 discloses "a UHF band miniaturized electronic duplexer", and the Chinese Utility Model Patent No. CN200920103975.1 discloses "a low-noise "Electrically tuned filter", the coupling structure adopted is a right-angled trapezoidal or rectangular single coupling hole form, which can cover a wide frequency range, but in the case of broadband signals, it is difficult to achieve a wider octave tuning range Within, maintain a constant bandwidth, good amplitude-frequency and echo characteristics. [0003] In the prior art, "Journal of Sichuan Institute of Light Chemical Industry" 1997 No. 3 article ...

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Problems solved by technology

[0002] In the prior art, the Chinese Utility Model Patent No. CN201220549062.4 discloses "a UHF band miniaturized electronic duplexer", and the Chinese Utility Model Patent No. CN200920103975.1 discloses "a low-noise "Electrically tuned filter", the coupling structure adopted is a right-angled trapezoidal or rectangular single coupling hole form, which can cover a wide frequency range, but in the case of broadband signals, it is difficult to achieve a wider octave tuning range Within, keep constant bandwidth, good amplitude frequency and echo characteristics

[0003] In the prior art, "Journal of Sichuan Institute of Light Chemical Industry" 1997 No. 3 article "Development of Four-Cavity Coaxial Tuned Microwave Filter", in the form described in the article, the inter-cavity coupling adopts a single rectangular hole, and the input and output excitation adopts a triangular The coupling loop is suitable for medium tuning range or narrow working bandwidth, but it is difficult to achieve constant bandwidth and constant amplitude-frequency response when broadband signals and wider tuning range are used. Secondly, the article described only in the 1. A fixed trapezoidal metal sheet is added to each of the fourth two resonators as a reactance compensation structure. Although the amplitude-frequency characteristics can be improved to a certain extent, there is no flexibility in design, processing and debugging, and it is not easy to have a good performance in a wide frequency range. response curve

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