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Wideband bandpass filter based on interdigital coupling resonator

A technology of band-pass filter and interdigital coupling, which is applied in the millimeter wave field to achieve the effects of suppressing out-of-band loss, widening the passband bandwidth, and improving the coupling degree

Inactive Publication Date: 2017-06-20
NANJING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a broadband bandpass filter based on interdigitated coupling resonators, which solves the requirements of the broadband bandpass filter with simple structure, easy processing, good electrical performance, large working bandwidth, and The problem with good out-of-band characteristics

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  • Wideband bandpass filter based on interdigital coupling resonator
  • Wideband bandpass filter based on interdigital coupling resonator
  • Wideband bandpass filter based on interdigital coupling resonator

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Embodiment Construction

[0021] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0022] The present invention designs a novel interdigitated multi-mode resonator (MMR), figure 1 That is, it shows the open multimode resonator structure composed of a low-impedance transmission line and two high-impedance transmission lines on both sides in the present invention, where (a) is the corresponding characteristic impedance and electrical dimension geometric diagram of the equivalent transmission line model, ( b) is a schematic diagram of the corresponding characteristic impedance and electrical dimensions of the equivalent transmission line model. Based on transmission line theory, figure 1 The characteristic parameters of the multimode resonator shown can be obtained analytically.

[0023] Through the analysis of the resonant frequency, the resonant frequency of the MMR can be adjusted reasonably to realize a broadband filter with g...

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Abstract

The invention discloses a broadband bandpass filter based on an interdigitated coupling multi-mode resonator (MMR), which comprises two mixed interdigitated coupling high impedance structures, one cross low impedance structure and two microstrip lines. The filter consists of a low-impedance resonator formed by the cross structure in the center, two four-wire interdigitated coupling structures located on both sides of the cross structure, a dielectric substrate and the underlying metal layer, and two microstrip lines connected as a whole to form a complete the resonant structure. This filter has a simple structure, is easy to process, has good electrical performance, has a large working bandwidth, and has good out-of-band characteristics. Compared with other types of broadband bandpass filters, it has the advantages of being more compact and easy to implement.

Description

technical field [0001] The invention relates to a broadband bandpass filter based on an interdigitated coupling resonator, which belongs to the technical field of millimeter waves. Background technique [0002] With the rapid development of the wireless communication business, the business of the microwave frequency band communication system is becoming more and more numerous, and the frequency resources are becoming more and more tense. The communication technology is developing towards a higher frequency band—millimeter wave. showed great potential. As a part used to separate signals, a filter is one of the key parts in a wireless communication system. Based on this, specialized research in the microwave field has led to the development of wideband bandpass filters. The traditional filter theory is systematically established under the assumption of a narrow frequency band, but it plays a very important role in the design process of each passband filter. [0003] Technic...

Claims

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Application Information

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IPC IPC(8): H01P1/203H01P1/20
CPCH01P1/2039H01P1/20
Inventor 许锋胡笑君
Owner NANJING UNIV OF POSTS & TELECOMM
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