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Adjustable microstrip band-pass filter with adjustable center frequency and invariable absolute bandwidth

A band-pass filter, center frequency technology, applied in waveguide-type devices, circuits, electrical components, etc., can solve the problems of difficult welding of adjustable devices, small perturbation size, etc., and achieve the effect of small size and simple structure design.

Inactive Publication Date: 2015-11-11
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

This method can achieve independent adjustment of frequency and bandwidth, but due to the relatively small size of the perturbation, it is difficult to weld the adjustable device

Method used

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  • Adjustable microstrip band-pass filter with adjustable center frequency and invariable absolute bandwidth
  • Adjustable microstrip band-pass filter with adjustable center frequency and invariable absolute bandwidth
  • Adjustable microstrip band-pass filter with adjustable center frequency and invariable absolute bandwidth

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Embodiment 1

[0021] to combine figure 2 , image 3 , taking the tunable bandpass filter whose central frequency is adjustable and the absolute bandwidth is constant at 1.7-2.3GHz as an example, the relative dielectric constant of the circuit substrate used is 10.2, and the thickness is 0.635m.

[0022]The specific parameters are: in the first rectangular microstrip line 3: l1 is 9mm, w2 is 1mm, l2 is 5.75mm; in the second rectangular microstrip line 4, l5 is 14mm, the width is 1mm, and the distance between the metal through hole 15 and the second rectangular The distance between the microstrip line 4 and the connection point of the first rectangular microstrip line 3 is 4mm; the length of the 50 ohm horizontal rectangular microstrip lines 1 and 6 is not limited, we take 3mm, and the width w1 is 0.6mm, the first vertical microstrip line 2. The length l5 of the second vertical microstrip line 5 is 14 mm, and the width is 0.2 mm. The distance between the vertical microstrip line and the sec...

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Abstract

The invention discloses an adjustable microstrip band-pass filter with an adjustable center frequency and an invariable absolute bandwidth. The adjustable microstrip band-pass filter comprises a microstrip structure, a dielectric substrate, and grounding metal. The microstrip structure comprises an input port, an input feed circuit, an input coupling matching circuit, an E-type dual-mode adjustable resonator, an output coupling matching circuit, an output feed circuit, and an output port. Microstrip line branches on both sides of the E-type dual-mode adjustable resonator are connected with variodes respectively. A middle microstrip line branch is connected with a variode through a capacitor. The input feed circuit comprises a horizontal microstrip line and a vertical microstrip line. The horizontal microstrip line extends to a position right between the two adjacent microstrip line branches of the E-type dual-mode adjustable resonator. The input coupling matching circuit comprises two coupled capacitors connecting the vertical microstrip lines with the microstrip line branches at both sides. The whole adjustable microstrip band-pass filter has structure of mirror symmetry, an adjustable center frequency, and an invariable absolute bandwidth, and can be used in a reconfigurable radiofrequency front-end system.

Description

technical field [0001] The invention relates to the technical field of radio frequency electric adjustable band-pass filters, in particular to an adjustable microstrip band-pass filter with adjustable center frequency and constant absolute bandwidth. Background technique [0002] With the rapid development of modern wireless communication systems, the contradiction of spectrum congestion has become increasingly prominent. In order to improve the availability of spectrum resources, spectrum technologies such as multi-passband, spread frequency hopping and dynamic frequency allocation are widely used, which greatly promotes the development of fast electronically adjustable or electrically reconfigurable filters. The rapid development of modern wireless communication technology puts forward higher and higher design requirements for the multi-function and miniaturization of wireless electronic equipment. It is mainly reflected in two aspects: In civilian use, the rapid developm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/203
Inventor 蔡传涛林善明顾辉黄烽王建朋
Owner NANJING UNIV OF SCI & TECH
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