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A full-band absorbing dual-band bandpass filter with complementary duplex structure

A dual-frequency bandpass and filter technology, applied in the electrical field, can solve the problems of communication system sensitivity reduction, nonlinear system performance impact, and communication system performance, etc., and achieve a small circuit structure size, easy processing and integration, and good filtering performance. Effect

Active Publication Date: 2021-08-03
BEIJING UNIV OF POSTS & TELECOMM
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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

Method used

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  • A full-band absorbing dual-band bandpass filter with complementary duplex structure
  • A full-band absorbing dual-band bandpass filter with complementary duplex structure
  • A full-band absorbing dual-band bandpass filter with complementary duplex structure

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Embodiment Construction

[0039] In order to facilitate those of ordinary skill in the art to understand and implement the present invention, the present invention will be further described in detail and in-depth below in conjunction with the accompanying drawings.

[0040]The present invention is a full-band absorption dual-band band-pass filter with a complementary duplex structure, which is composed of a dual-band band-pass filter structure based on an open coupling line stub and a complementary dual-band stop absorption branch with an absorbing stub. By adding complementary dual-band stop absorption branches at the two ports, the dual-port reflected noise full-frequency absorption function can be realized. In addition, the overall dual-frequency filter has a small size and a wide bandwidth, which meets the trend of miniaturization and bandwidth requirements of communication systems. Moreover, the overall dual-frequency filter is a simple planar structure, which is easy to implement, and can absorb ...

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Abstract

The invention discloses a full-band absorption dual-band bandpass filter with a complementary duplex structure, which belongs to the electrical field; the overall structure is composed of a dual-band bandpass filter structure and a left-right symmetrical complementary dual-band stop absorption branch; the dual-frequency bandpass filter structure includes The coupling line c and the microstrip line s1 connected to it; the microstrip line s1 is respectively connected to the left and right complementary dual-band stop absorbing branches, and is also connected to the input port and output port; the complementary dual-band stop absorbing branch includes absorbing branches and ladder impedance Open-circuit stub; ladder impedance open-circuit stub includes series-connected microstrip lines s3 and s4; absorbing stub includes series-connected microstrip line s5 and grounding resistor R1; when the signal is input from the first port, the in-band signal is transmitted through the dual-band bandpass filter structure To the output port, the out-of-band signal is absorbed by the complementary dual-band band-stop absorption branch, and the current is converted into energy for dissipation through the resistance of the energy-dissipating element. The invention prevents unnecessary signals from being reflected into connected equipment and causing interference to the performance of the 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/203
CPCH01P1/203
Inventor 吴永乐张一凡于会婷王卫民
Owner BEIJING UNIV OF POSTS & TELECOMM
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