Full-band absorption dual-frequency band-pass filter with complementary duplex structure

Abstract

The invention discloses a full-band absorption dual-frequency band-pass filter with a complementary duplex structure, and belongs to the electrical field. The overall structure is composed of a dual-frequency band-pass filtering structure and complementary dual-frequency band-stop absorption branches in bilateral symmetry. The dual-frequency band-pass filtering structure comprises a coupling line c and a microstrip line s1 connected with the coupling line c; the microstrip line s1 is respectively connected with the left and right complementary dual-frequency band-stop absorption branches, and is also connected with the input port and the output port; the complementary dual-frequency band-stop absorption branch comprises an absorption branch knot and a stepped impedance open-circuit branch knot; the stepped impedance open-circuit branch knot comprises microstrip lines s3 and s4 which are connected in series; the absorption branch knot comprises a microstrip line s5 and a grounding resistor R1 which are connected in series; and when a signal is input from the first port, an in-band signal is transmitted to the output port through the dual-frequency band-pass filtering structure, an out-of-band signal is absorbed through the complementary dual-frequency band-stop absorption branch, and current is converted into energy to be dissipated through the energy dissipation element resistor. According to the invention, useless signals are prevented from being reflected to equipment connected with the useless signals to cause interference on the performance of a communication system.

Description

technical field [0001] The invention belongs to the electrical field, and relates to a passive radio frequency device, in particular to a complementary duplex structure full-band absorption dual-band bandpass filter. Background technique [0002] At present, with the rapid development of communication technology and the increasing diversification of people's requirements for communication functions, the demand for multi-band and high-performance microwave devices that can be applied to various communication standards is increasing. With the development of 5G mobile communication systems, the entire mobile communication industry has begun to explore new frequency bands. [0003] At present, many countries around the world have begun to use sub-6GHz spectrum resources for 5G communications. Filters are key components in RF front-end systems and are widely used in antenna feed networks for wireless communications and satellite navigation systems. Such as antenna arrays, power ...

AI Technical Summary

Problems solved by technology

Non-linear components such as amplifiers have relatively high sensitivity to noise and reflected signals, which will have a relatively large impact on the performance of the nonlinear system, resulting in reduced sensitivity of the communication system, low signal-to-noise ratio, and serious Affects the performance of the communication system

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