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Miniature dual-band band-pass filter with adjustable low band

A filter and passband technology, applied in the field of double passband bandpass filters, can solve problems such as large volume, and achieve the effect of large adjustable range

Active Publication Date: 2012-06-27
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current research, there are also adjustable low and medium passbands, but most of them are realized with two sets of resonators, which inevitably results in too large a volume.

Method used

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  • Miniature dual-band band-pass filter with adjustable low band
  • Miniature dual-band band-pass filter with adjustable low band
  • Miniature dual-band band-pass filter with adjustable low band

Examples

Experimental program
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Embodiment

[0036] The structure of the highly selective dual bandpass filter with independent adjustable passband is as figure 1 As shown, the relevant dimensions are as follows image 3 Shown. The thickness of the dielectric substrate is 0.81mm, the relative dielectric constant is 3.38, and the loss tangent is 0.0027. The U-shaped structure of the resonator can effectively reduce the size of the filter. Both varactor diodes use Toshiba's 1sv277, the cathode of the varactor diode is connected to the capacitor, and the other end is connected to the underlying ground metal through a metalized via through the intermediate dielectric substrate. Such as image 3 As shown, the size parameters of each microstrip line of the filter are as follows: L 1 =21.3±0.2mm, W 2 =1±0.2mm, L 6 =3.3±0.2mm, W 2 =0.7±0.1mm, L 8 = 21.5±0.2mm, W 4 =0.6±0.1mm, L 5 =6.7±0.2mm, W 1 =1.86mm, L 3 =19.3±0.4mm, W 3 =1±0.1mm, L 2 =16.6±0.3mm, W 5 =2.3±0.1mm, L 7 =0.8±0.1mm, W 8 =2±0.1mm, L 4 =17.5±0.2...

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Abstract

The invention discloses a miniature dual-band band-pass filter with an adjustable low band, the miniature dual-band band-pass filter comprises an upper layer micro-band structure, a middle layer medium substrate and a lower layer grounded metal sheet. The filter comprises two resonators and two feeder lines; the centers of the two resonators are symmetric; and each resonator comprises a main transmission micro-band line with both ends being short-circuited, an open-circuit branch line which is loaded at the middle point of the main transmission line, a varactor and a capacitor. When the resonators work under the low band, the resonators being one fourth wavelength are corresponded to; and when the resonators work under a high band, the resonators being one second wavelength are corresponded to. One sides of the feeder lines are coupled with the resonators to feed power, and the other sides of the feeder lines are directly lapped on the resonators to feed power. The miniature dual-band band-pass filter with the adjustable low band has the characteristics that: the central frequency of the low band is adjustable while the high band remains unchanged.

Description

Technical field [0001] The present invention relates to a dual-pass band band-pass filter, in particular to a dual-pass band band-pass filter with adjustable low-pass band, small volume, and applicable to radio frequency front-end circuits. Background technique [0002] In today's society, with the development of wireless communications, the design of low-cost, high-performance reconfigurable radio frequency subsystems has become a hot issue. Reconfigurable communication systems have an extremely urgent need for tunable filters that can cover a larger frequency range. [0003] At present, many researchers have used many different adjustment devices in the design of tunable bandpass 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 CZ Li, "A tunable microstrip bandpass filter with two independently adjustable transmission zeros," IEEE Microw...

Claims

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Application Information

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IPC IPC(8): H01P1/203
Inventor 章秀银高立
Owner SOUTH CHINA UNIV OF TECH
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