Switchable Bandpass-Bandstop Filter Based on Parallel Coupled Lines

Abstract

The invention discloses a switchable band pass-band stop filter based on a parallel coupling line. The switchable band pass-band stop filter is manufactured on a two-side copper-covering micro-strip plate in a circuit board printing manner. An input end feeder head port 1, an output end feeder head port 2, a first port feeder, a second port feeder, four resonators and three radio frequency switches are formed on the same side of the two-side copper-covering micro-strip plate. The input end feeder head port 1 is used for inputting electromagnetic wave signals. The output end feeder head port 2 is used for outputting the electromagnetic wave signals. The resonators are composed of stripped micro-strips. Coupling clearances are formed in places between the resonators and the port feeders. According to the arrangement, the switch state is under control by controlling supply voltage of the radio frequency switches, and accordingly status switch of the band pass-band stop filter is controlled, with center frequencies of the band pass-band stop filter are in consistence. The switchable band pass-band stop filter has the advantages that switching between the band pass filter and the band stop filter is achieved, the center frequencies are in consistence, structure is simple, and size is small.

Description

technical field [0001] The invention relates to the technical field of planar microstrip filters, in particular to a switchable bandpass-bandstop filter based on parallel coupled lines. 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. [000...

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Problems solved by technology

[0006] At the same time, the information also shows that in March 2014, the article "0.7-1.0-GHz Reconfigurable Bandpass-to-Bandstop Filter With Selectable 2-and 4-Pole Responses" by Young-Ho Cho and Gabriel M.Rebeiz has been accepted by the technical field The top journal "IEEETRANSACTIONS ON MICROWAVE THEORYAND TECHNIQUES" is accepted and ready to be published. This article discloses a filter design, which can also switch between a band-pass filter and a band-stop filter through a radio frequency switch, but the filter exists Disadvantages of complex structure

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