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Plane compact type three-passband filter

A compact and filter technology, applied in the field of filters, can solve the problems of difficult control of frequency and bandwidth, and achieve the effect of high space utilization, compact structure and easy integration

Inactive Publication Date: 2010-04-28
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is characterized by high integration and simple process. The disadvantage is that the three frequencies are interrelated, and the frequency and bandwidth are difficult to control.

Method used

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  • Plane compact type three-passband filter
  • Plane compact type three-passband filter
  • Plane compact type three-passband filter

Examples

Experimental program
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Embodiment 1

[0039] The center frequency of the three-pass band of the planar compact three-pass band filter is controlled at 1.95GHz, 2.45GHz and 3.5GHz. The dielectric constant of the substrate material of the filter is 2.94, and the thickness is 0.762mm. The structural size of the filter is: the width of the microstrip line of the center-loaded resonator is 1 mm, and the length of the first microstrip line 5 is L 3 =5.6mm (the length of the coupling microstrip line between the first center-loaded resonator and the second center-loaded resonator), the length of the third microstrip line 7 is d=5.9mm, and the length of the fourth microstrip line 9 is L 1 =12.45mm, the length of the fifth microstrip line 10 is L 2 =9.7mm (the width of the first center-loaded resonator), the coupling gap between the first center-loaded resonator and the second center-loaded resonator stage g=0.3mm, T-shaped structure (see image 3 ) upper arm length L 6 =5mm, height L 5 = 10.25mm, the coupling gap betwee...

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Abstract

The invention discloses a plane compact type three-passband filter, which is realized by a centrally loaded resonator and an embedded half-wavelength resonator. The centrally loaded resonator consists of a microstrip line and a centrally loaded T-shaped structure and is used to generate a first passband and a third passband; the half-wavelength resonator is embedded into the centrally loaded resonator and is used to generate a second passband; and an interdigital coupling structure is used to realize interstage electromagnetic coupling. For the second passband, the structure can realize source-load coupling, so as to generate a pair of transmission zero point near the second passband and increase the roll-off property. The whole filter adopts a planar structure, is centrosymmetric and can realize the screening of signals at three different frequency bands. Both sides of each passband of the filter are provided with at least one transmission zero point, so high skirt selectivity is achieved. Meanwhile, the filter has the characteristics of small size, high space utilization rate, easy processing and the like.

Description

technical field [0001] The invention relates to a filter for transmitting and receiving signals in technical fields such as mobile communication, satellite communication and microwave communication, and is a planar compact three-pass band filter whose pass band can be flexibly controlled. Background technique [0002] In recent years, multi-band, multi-standard wireless communication systems have attracted more and more attention, and multi-band bandpass filters have extremely wide applications. In a wireless communication system, a filter is an extremely important component, and its function is to pass necessary signals and filter out unnecessary signals. [0003] To realize the screening of three-band signals, the traditional method is to use three single-pass band filters, and use the three filters to process the signals separately, and each filter screens out the corresponding frequency band signals. This method is characterized by simplicity and feasibility , is easy t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/20H01P1/203H01P1/205
Inventor 章秀银张新平胡斌杰
Owner SOUTH CHINA UNIV OF TECH
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