Microstrip filter based on electromagnetic mixed coupling

Abstract

The invention discloses a microstrip filter based on electromagnetic mixed coupling. The microstrip filter comprises a microstrip board and further comprises a metallized through hole, a first resonator, a second resonator, a third resonator, an input port feeder line and an output port feeder line which are arranged on the microstrip board. One ends of the first resonator, the second resonator and the third resonator are connected with the metallized through hole, and the first resonator, the third resonator and the second resonator are arranged to be in central line symmetry. The input port feeder line and the output port feeder line are symmetrically arranged on the outer side of the first resonator and the outer side of the third resonator respectively. The microstrip filter can adjust the intensity of magnetic coupling and electric coupling, so that the bandwidth of the filter is controlled flexibly, and the size is small.

Description

technical field [0001] The invention relates to a microwave filter, in particular to a microstrip filter based on electromagnetic hybrid coupling. Background technique [0002] In recent years, the rapid development of wireless communication, the popularity of 3G technology, and the arrival of 4G all indicate that wireless technology will usher in a peak period of vigorous development. At the same time, with the popularity of wireless electronic products in people's lives, miniaturization and low cost have become the trend of electronic products. On the other hand, with the rapid development of electronic information, the increasingly scarce spectrum resources are becoming more and more scarce. In order to improve the communication capacity and reduce the signal crosstalk between adjacent channels, higher requirements are put forward for the selectivity and integration of filters. The microstrip filter meets these requirements. [0003] As an important device in the microw...

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Problems solved by technology

[0004] In the prior art, in July 2009, Chu Qingxin and Wang Huan applied for the patent of "Controllable Electromagnetic Coupling Microstrip Split Ring Resonator Filter", which uses a microstrip split ring resonator, but the electrical coupling and magnetic coupling are intertwined, not independent

[0005] In May 2012, Ouyang Xiao from South China University of Technology published a master's degree thesis entitled "Research on Hybrid Electromagnetic Coupling Filters", using a hybrid electromagnetic coupling split-ring filter, in which the electrical coupling and magnetic coupling cannot be adjusted independently

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