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Frequency and?bandwidth-adjustable radio frequency filter

A radio frequency filter and bandwidth technology, applied in the field of adjustable radio frequency filters, can solve problems such as the inability to change the coupling coefficient, the difficulty of continuous tuning of the filter, and the deterioration of the filter input voltage standing wave ratio.

Inactive Publication Date: 2014-05-28
ZHEJIANG TEXTILE & FASHION COLLEGE
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AI Technical Summary

Problems solved by technology

Current filters loaded with devices such as varactor diodes and (micromechanical) MEMS can only change the center resonant frequency, and there is no way to change the coupling coefficient, so the bandwidth of the filter cannot be tuned, and the input voltage standing wave ratio of the filter will deteriorate, so Difficult to achieve continuous tuning of filter center frequency and bandwidth

Method used

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  • Frequency and?bandwidth-adjustable radio frequency filter
  • Frequency and?bandwidth-adjustable radio frequency filter
  • Frequency and?bandwidth-adjustable radio frequency filter

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Embodiment Construction

[0012] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0013] A radio frequency filter with adjustable frequency and bandwidth, including a metal cavity 1, a connector assembly and a filter device, the connector assembly is arranged outside the metal cavity to realize signal input and output, and the filter device includes a feed The end assembly and a plurality of resonant units 2 parallel to each other, the feed end assembly is connected to the connector assembly, the feed end assembly is composed of a feed transmission line, the resonant unit 2 is composed of a resonant transmission line, the structure of the feed transmission line is the same as the structure of the resonant transmission line Similarly, the resonant transmission line includes a metal gate layer 7, a silicon dioxide layer 8, and an original highly doped layer 9 distributed sequentially from top to bottom; after a bias voltage is...

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Abstract

The invention discloses a frequency and?bandwidth-adjustable radio frequency filter. Each resonant element is formed by a resonant transmission line. A feeding transmission line has the same structure as the resonant transmission line. The resonant transmission line comprises a metal gate layer, a silicon dioxide layer and an original high-doping layer sequentially distributed from the top bottom; after bias voltage is applied to the metal gate layer, a channel inversion layer, a PN junction layer and a rear high-doping layer distributed from the top bottom are formed inside the original high-doping layer; the silicon dioxide layer and the PN junction layer serve as an insulation layer; the metal gate layer and the rear high-doping layer serve as ground; and the middle channel inversion layer serves as a transmission wire. Through changing the size of the channel, that is, changing characteristic impedance of the transmission line, tuning of the filter is realized. The center frequency and the bandwidth can be continuously adjustable due to distributed parameters.

Description

technical field [0001] The invention relates to an adjustable radio frequency filter applied to software radio and cognitive radio, in particular to a radio frequency filter capable of rapidly tuning center frequency and bandwidth. Background technique [0002] Software radio and cognitive radio technology is the current and future development direction of wireless communication technology. Software radio can switch between different communication systems on the same hardware platform through software settings according to system needs. Its advantages are to save the operator's network construction cost and new network construction time, and save the investment in hardware equipment. Cognitive radio is a communication technology proposed to cope with the increasingly severe shortage of spectrum resources and make full use of idle spectrum. Its working mode is to find idle spectrum resources through spectrum detection and use them for communication. When the system specifie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/207
Inventor 张海力
Owner ZHEJIANG TEXTILE & FASHION COLLEGE
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