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A Tunable Filter with Constant Bandwidth

A technology with constant bandwidth and filters, applied in waveguide devices, circuits, electrical components, etc., can solve problems such as poor out-of-band rejection of adjustable filters

Active Publication Date: 2020-07-31
36TH RES INST OF CETC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the problem of poor out-of-band rejection of tunable filters in the prior art, a tunable filter with constant bandwidth of the present invention is proposed to overcome the above-mentioned technical problems by increasing the parallel branch of the resonator to improve the out-of-band rejection

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  • A Tunable Filter with Constant Bandwidth
  • A Tunable Filter with Constant Bandwidth
  • A Tunable Filter with Constant Bandwidth

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Embodiment Construction

[0025] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0026] In the description of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, use a specific orientation construction and operation, therefore should not be construed as limiting the application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be co...

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Abstract

The invention discloses a constant-bandwidth tunable filter. The constant-bandwidth tunable filter comprises a resonant ring, wherein the resonant ring comprises two or more resonators which are of the same structure and are symmetrically arranged side by side; each resonator comprises a transmission line body, wherein the transmission line body comprises a main transmission section distributed inthe longitudinal direction; the upper end and the lower end of the main transmission section are transversely split into two segments separately to form four parallel branches of the same lengths andsame widths; the tail ends of the two parallel branches located at the upper end are grounded through variable capacitors respectively, and the tail ends of the two parallel branches located at the lower end are grounded directly; and the adjacent resonators are coupled through an end plane defined by the parallel branches. The resonant ring of the tunable filter comprises a plurality of resonators which are transversely and symmetrically arranged side by side, wherein the resonators are of the same structure; in addition, by adoption of the branch parallel structure, the Q value (quality factor) of the resonators can be improved; and based on the high-Q-value resonators, a high-order reconstruction filter with high Q value and constant absolute bandwidth can be established through electric and magnetic coupling.

Description

technical field [0001] The invention relates to the technical field of adjustable and reconfigurable microwave devices, in particular to an adjustable filter with constant bandwidth. Background technique [0002] In the broadband receiving system, regardless of the superheterodyne system, zero-IF system or RF direct acquisition system, the form of sub-band filters is currently used as the pre-selection filter bank of the RF front-end, which is not only large in size and weight, but also requires Special customization will bring problems such as long development cycle and high cost. The use of tunable filters can change the resonant frequency, and then change the working frequency band of the filter to meet different task requirements. It is expected to replace the sub-band filter bank, thereby making the RF front-end more miniaturized. [0003] But at present, tunable filters are limited by problems such as poor out-of-band rejection (out-of-band rejection refers to the deg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/20H01P1/203
CPCH01P1/20H01P1/203H01P1/20381
Inventor 黄晓国张锦旗
Owner 36TH RES INST OF CETC
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