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High-selectivity double band-pass filter with independent adjustable passband

A dual-bandpass filter, high selectivity technology, applied in the direction of waveguide devices, electrical components, circuits, etc., can solve the problem of limited frequency coverage and achieve the effect of increasing frequency coverage

Active Publication Date: 2014-02-12
广州锦峰信息技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the single pass band tunable filter can only be tunable in a single frequency range, so its frequency coverage is very limited

Method used

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  • High-selectivity double band-pass filter with independent adjustable passband
  • High-selectivity double band-pass filter with independent adjustable passband
  • High-selectivity double band-pass filter with independent adjustable passband

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Embodiment

[0033] The structure of a highly selective dual bandpass filter with independently adjustable passbands is as figure 1 As shown, the relevant dimensions are as follows Figure 4 shown. The thickness of the dielectric substrate is 0.81mm, the relative permittivity is 3.38, and the loss tangent is 0.0027. The serpentine structure of the resonator can effectively reduce the size of the filter. The first varactor diode 17, the second varactor diode 19, the third varactor diode 18, and the fourth varactor diode 20 adopt Toshiba's 1sv277, and the negative pole of the first varactor diode 17 is connected to one end of the microstrip line, and the other end passes through a The metallized via hole passing through the intermediate dielectric substrate is connected to the ground metal of the lower layer. Such as Figure 4 As shown, the size parameters of each microstrip line of the filter are as follows: the length of the first microstrip line 1 is L 5 =2.6±0.2mm, the length of the...

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Abstract

The invention discloses a high-selectivity double band-pass filter with an independent adjustable passband, which comprises an upper micro-strip structure, a middle medium substrate and a lower ground metal plate. The filter is composed of four resonators; each resonator comprises a micro-strip line and a variable capacitance diode; the resonators are one fourth wavelength resonators, and are symmetrically arranged with respect to a central longitudinal shaft of the micro-strip structure. The first and second resonators take the micro-strip line, which is directly connected to the resonator and is parallelly coupled with the resonator, as a feed structure, while the third and fourth resonators take the micro-strip line, which is parallelly coupled with the resonator, as the feed structure. Besides, a pseudo cross finger structure is used to generate a transmission zero point, so that the filter is endowed with higher selectivity. The high-selectivity double band-pass filter with the independent adjustable passband has the characteristics of adjustable double passband central frequency and independent tuning.

Description

technical field [0001] The present invention relates to a double-bandpass filter with adjustable center frequency, in particular to an adjustable double-bandpass filter which can be applied to radio frequency front-end circuits without affecting each other when the center frequency is tuned. . Background technique [0002] In today's society, with the development of wireless communication, the design of low-cost, high-performance reconfigurable RF subsystem has become a hot issue. Reconfigurable communication systems have an extremely urgent need for tunable filters that can cover a large frequency range. [0003] At present, many researchers have used many different adjustment devices for the design of adjustable band-pass filters, among which there are several typical methods. The first method is to change the length of the resonator through a varactor diode to change the resonant frequency, such as J.Long and C.Z.Li, "A tunable microstrip bandpass filter with two indepe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/203
Inventor 章秀银曹云飞代鑫张耀文
Owner 广州锦峰信息技术有限公司
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