Multi-band-pass zero reflection filter

A filter and zero-reflection technology, which is applied to waveguide devices, circuits, electrical components, etc., can solve the problems of large circuit size, circuit structure or device performance limitations, and small absorption frequency range of reflected signals, so as to reduce the circuit size , Improve the absorption frequency range and reduce the number by half
CN110148816AActive Publication Date: 2019-08-20HUAZHONG UNIV OF SCI & TECH +1
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Patent Information

Authority / Receiving Office
CN ยท China
Current Assignee / Owner
HUAZHONG UNIV OF SCI & TECH
Publication Date
2019-08-20

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Abstract

The invention discloses a multi-band-pass zero reflection filter which comprises a multi-mode resonator and lossy absorption networks. The multi-mode resonator is coupled to input and output feeders at ports of the filter to form a band-pass branch. A band stop branch of the filter is formed by the lossy absorption networks and an even mode equivalent circuit of the multi-mode resonator. Transmission poles of the band-pass branch are from even mode resonance points and odd mode resonance points of the multi-mode resonator. A half of transmission zero points of the band stop branch is from theeven mode resonance points of the multi-mode resonator. Resonance points of the lossy absorption networks are corresponding to the odd mode resonance points of the multi-mode resonator and are used asanother half of transmission zero points of the band stop branch. The transmission poles of the band-pass branch are corresponding to the transmission zero points of the band stop branch. According to the invention, the frequency absorption range of a reflected signal is improved by multiplexing the even mode resonance points of the multi-mode resonator, and the same time, the circuit size is reduced.
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Description

technical field

[0001] The invention belongs to the technical field of band-pass filters, and more specifically relates to a multi-pass band zero-reflection filter. Background technique

[0002] The filter is an indispensable component in the RF front-end, which is used to realize the selection of the signal in the frequency domain. The working principle of traditional filters is to transmit passband signals and reflect stopband signals, which can be referred to as "stopband reflective filters". In the RF front-end chain, there are back and forth reflection signals between traditional filters and adjacent active modules, which will introduce additional intermodulation products to many active modules including amplifiers, frequency multipliers, mixers, etc. , Increase the gain fluctuation range, reduce the effective linear working range, reduce efficiency and other effects, so that the working performance of the active module in the link is significantly reduced. Therefore,...

Claims

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