Four Port Low Reflection Duplex Filter

Abstract

The invention discloses a four-port low-reflection duplex filter, comprising: a first port, a second port, a third port, a fourth port, four low-pass branch inductors, two high-pass branch inductors, four a high-pass branch capacitor, two low-pass branch capacitors; the two low-pass branch inductors of each group are connected in series to form two inductor series branches; the common points of the two inductor series branches are connected in parallel A low-pass branch capacitance, the independent terminals of the low-pass branch capacitance are grounded to form two low-pass branches; the two high-pass branch capacitances of each group are connected in series to form two capacitance series branches; the two A high-pass branch inductance is connected in parallel at the common points of the capacitor series branches, and the independent endpoints of the high-pass branch inductance are grounded to form two high-pass branches; the present invention can obtain a four-port low-reflection duplex filter, after frequency conversion , can have low-pass and high-pass, band-pass and band-stop two filtering modes, which can effectively reduce the influence of stop-band reflection signals.

Description

Four-port low reflection duplex filter technical field [0001] The present invention relates to a four-port low-reflection duplex filter, which belongs to the technical field of filter electronic components. Background technique [0002] At present, a filter is a kind of electronic device, which is widely used in various electronic systems. The device generally has two terminals port, allowing the electrical signal in the pass band to pass through without loss or low loss, while prohibiting the electrical signal in the stop band from passing between the two ports transfer between. [0003] Existing filters are generally reflective. If the reflected signal power is large, after being reflected to the input end, it will affect the The subsequent circuit causes uncertain effects. In order to reduce or eliminate the influence caused by the reflected signal, a series of Research on reflection-free filter circuits. However, most of the proposed non-reflection filter struc...

AI Technical Summary

Problems solved by technology

[0004] Purpose: In order to overcome the deficiencies in the prior art of complex non-reflection filter structure, single function, and only one-way filter, the present invention provides a four-port low-reflection duplex filter, which is simple in structure and easy to manufacture. The port low-reflection duplex filter can perform bidirectional filtering of low-pass and high-pass, band-pass and band-stop characteristics while reducing the influence of stop-band reflection signals

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