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Electrically tunable filter of varactor

A technology of filters and varactors, which is applied to waveguide devices, circuits, electrical components, etc., can solve problems such as poor sideband filtering effect, poor square coefficient, and failure to meet requirements, etc., achieve good square coefficient, improve Effect of filtering performance, fast tuning speed

Active Publication Date: 2012-07-11
SOI MICRO CO LTD
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Problems solved by technology

[0004] In the process of realizing the present invention, the applicant realizes that the following technical defects exist in the prior art: the existing varactor electric tuning filter usually adopts Butterworth synthesis or Chebyshev synthesis, and the rectangular coefficient of the design scheme of these filters is not good, specifically Generally speaking, there is no steep edge, so the filtering effect on the sideband is not good, so it cannot meet the demand in occasions with high requirements for sideband suppression

Method used

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  • Electrically tunable filter of varactor
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  • Electrically tunable filter of varactor

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Embodiment Construction

[0017] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings. While illustrations of parameters containing particular values ​​may be provided herein, it should be understood that the parameters need not be exactly equal to the corresponding values, but rather may approximate the corresponding values ​​within acceptable error margins or design constraints.

[0018] In the theory of electromagnetic field, electromagnetic waves are transmitted in the form of sine waves on the transmission line, and there will be voltage peak points and wave nodes at specific positions. At the voltage peak point, the voltage reaches the maximum value, and the current is 0 at this time, which is expressed in the form of an electric field. ; At the voltage wave node, the voltage reaches the minimum value, a...

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Abstract

The invention discloses an electrically tunable filter of a varactor, comprising an input micro-strip line, a first micro-strip resonator, a second micro-strip resonator and an output micro-strip line, wherein the first micro-strip resonator and the second micro-strip resonator open outwards and are arranged side by side in a mirror image manner, the adjacent parts of the first micro-strip resonator and the second micro-strip resonator form direct coupling; the input micro-strip line and the output micro-strip line are respectively arranged below the first micro-strip resonator and the second micro-strip resonator and are arranged side by side in a mirror image manner, the tail ends of the input micro-strip line and the output micro-strip line both deflect for 90 degrees along the direction away from the first micro-strip resonator and the second micro-strip resonator and two deflected parts are mutually parallel to form cross coupling and the symbol of the cross coupling is opposite to the symbol of the direct coupling. The transfer function of the electrically tunable filter of the varactor generates a transmission zero point and has the like elliptic function feature, and therefore the filter has good rectangle coefficient, and the filtering performance is improved.

Description

technical field [0001] The invention relates to the technical field of signal processing in the electronics industry, and in particular to a variable capacitance tube electrically adjustable filter. Background technique [0002] Electrically tunable filters are used in occasions where frequency changes, especially in the field of radar detection, to filter signals, so as to obtain a relatively pure spectrum and improve the anti-interference ability of the system. Electrically tunable filters are generally classified into two types: Yttrium Iron Garnet (YIG for short) electrically tunable filters and varactor electrically tunable filters. YIG electric tunable filter has a high quality factor, but due to the influence of hysteresis effect, its tuning speed is slow, so it cannot be applied to frequency agility occasions. The tuning speed of the varactor electronically tuned filter is fast, which can meet the needs of agile frequency conversion, and a high quality factor can be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/203
Inventor 向永波阎跃鹏彭军刘谋
Owner SOI MICRO CO LTD
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