A High-Order Tunable Bandpass Filter Based on Cross-Coupling Structure

A technology of cross-coupling and coupling structure, which is applied in the direction of waveguide devices, circuits, electrical components, etc., can solve the problem that the passband and transmission zero point of the adjustable filter are not consistent, the electric and magnetic resonators are difficult to control, and the bandwidth is not constant, etc. problem, to achieve the effect of simple structure, lower insertion loss, and convenient Q value

Active Publication Date: 2019-02-26
SOUTHWEST JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

K.T.Park et al. in "Lowvoltage tunable narrow bandpass filter using cross-coupled stepped-impedance resonator with active capacitance circuit" ("Low voltage tunable narrow bandpass filter with cross-coupled step resonator with active capacitance circuit") A fourth-order tunable filter is proposed by using cross-coupled step resonators; however, the electric and magnetic properties of the resonators in the tunable filter are difficult to control, so the passband and transmission zero of the tunable filter have inconsistencies. too consistent, and its bandwidth is not constant

Method used

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  • A High-Order Tunable Bandpass Filter Based on Cross-Coupling Structure
  • A High-Order Tunable Bandpass Filter Based on Cross-Coupling Structure

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Embodiment

[0021] Combined with the manual figure 1 , the present invention provides a specific embodiment of a fourth-order electrically tunable bandpass filter based on a cross-coupling structure, including: a dielectric substrate with a metal microstrip structure on the top surface and a metal ground plate on the bottom surface, the metal microstrip The strip structure includes: two sections of feeders symmetrically arranged left and right and four tunable resonators arranged between the two sections of feeders;

[0022] Wherein: the two first tunable resonators are symmetrically arranged about the symmetrical center line of the input port feeder line and the output port feeder line, the first tunable resonator includes the first adjustable capacitor 1 and is respectively loaded on the first adjustable capacitor The first bent microstrip line 2 and the first grounded microstrip line 31 at both ends of 1, the first bent microstrip line 2 includes the first microstrip line 201, the seco...

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Abstract

The invention discloses an adjustable band-pass filter based on a cross-coupling structure, which relates to the field of radio frequency devices. The present invention includes a dielectric substrate with a metal microstrip structure on the top surface and a metal grounding plate on the bottom surface. The metal microstrip structure includes two symmetrically arranged feed lines and four adjustable A tuned resonator, the present invention realizes that the fourth-order adjustable bandpass filter has a constant absolute bandwidth through a rational design structure, and the filter realizes a symmetrical transmission zero point based on a cross-coupling structure, which can effectively improve the frequency selectivity, and the present invention also It can effectively reduce the insertion loss in the adjustment range and improve the higher attenuation characteristics in the stop band. The filter provided by the invention has practical significance in being applied to high-order design and synthesis.

Description

technical field [0001] The invention relates to the field of radio frequency devices, in particular to a high-order electrically tunable bandpass filter with a cross-coupling structure. Background technique [0002] At present, many tunable microstrip filters used to increase the flexibility of radio frequency filters, as a basic device for radio frequency signal processing, are widely used in multi-band and software radio systems. In order to increase passband selectivity, high order filters are a common solution. [0003] For the design of high-order filters, corresponding methods are also provided in some literatures. K.T.Park et al. in "Lowvoltage tunable narrow bandpass filter using cross-coupled stepped-impedance resonator with active capacitance circuit" ("Low voltage tunable narrow bandpass filter with cross-coupled step resonator with active capacitance circuit") A fourth-order tunable filter is proposed by using cross-coupled step resonators; however, the electri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/203
CPCH01P1/20381
Inventor 田登尧向乾尹冯全源
Owner SOUTHWEST JIAOTONG UNIV
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