Small-sized passband controllable low-loss four-band bandpass filter

A four-band, filter technology, applied in the field of passband controllable low-loss small four-band bandpass filter, to achieve the effect of good overall performance and high selectivity

Inactive Publication Date: 2018-04-13
SHANGHAI MARITIME UNIVERSITY
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, there are many open problems in optimizing the size reduction of circuits containing resonators, such as RF filters and oscillators

Method used

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  • Small-sized passband controllable low-loss four-band bandpass filter
  • Small-sized passband controllable low-loss four-band bandpass filter
  • Small-sized passband controllable low-loss four-band bandpass filter

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Embodiment Construction

[0033]In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further elaborated below in conjunction with the accompanying drawings.

[0034] figure 1 It is a schematic diagram of the geometric structure of a small four-band bandpass filter with controllable passband and low loss of the present invention. The filter includes: two-order multi-twig loaded four-mode resonator ①, the resonators are cascaded and coupled through the gap to realize the four-pass band, 1 is the short-circuit stub of this type of resonator, 2 and 3 are the short-circuit of this type of resonator Two open-circuit stubs; a two-port single-finger coupling structure network is adopted, and there are two feeder lines 5 and two coupling lines 4, and the signal input and signal output ports are respectively located on the left and right sides of the structure.

[0035] figure 2 Topology diagram of a mult...

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Abstract

The invention discloses a novel surface-mounted topological structure, in particular, a multi-stub loading multi-mode resonator-based small-sized passband controllable low-loss four-band micro-strip bandpass filter and belongs to the microwave communication field. The filter is formed by means of the coupling of a second-order multi-stub loading four-mode resonator, so that the filter can be of asymmetrical structure, and therefore, the compactness of the structure of the filter can be ensured. The resonator of the filter has four individually controllable resonance modes, which results in the independent controllability of the center frequency of the filter, and therefore, the bandwidth of the filter can be controlled through adjusting the coupling coefficient of the two resonators, andthe passband controllability of the filter can be ensured. A two-port single-finger end-coupling structure network is adopted to design the filter; the two-port single-finger end-coupling structure network is provided with two feeder lines; a signal input port and a signal output port are respectively arranged at the left and right side of the topological structure; and therefore, low loss can beensured. A cascaded coupling structure is adopted to realize four-pass bands, so that the practicality of the filter can be ensured.

Description

technical field [0001] The invention relates to the field of microwave communication, in particular to a small four-frequency bandpass filter with controllable passband and low loss. Background technique [0002] With the rapid development of communication technology, filters have always played an important role in microwave circuits. Filters are the core of many design issues in radio technology, and have gradually become an important challenge for new developments in many fields. Filters play an irreplaceable role in the entire communication system. However, the spectrum of electromagnetic waves is limited (the wavelength range of microwaves is 1m to 1mm, and its frequency range is 300MHz to 300GHz), and must be allocated according to the application. At this time, the filter As a frequency selection device, its fundamental function is to suppress signals in unwanted frequency bands and allow signals in required frequency bands to pass through smoothly. The ideal filter s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/203
CPCH01P1/2039
Inventor 张颖张友俊
Owner SHANGHAI MARITIME UNIVERSITY
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