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Electronically adjustable low-pass filter with generalized Chebyshev response

A low-pass filter, Chebyshev technology, applied in electrical components, impedance networks, multi-terminal-pair networks, etc., can solve the problem of low selectivity, and achieve the effect of mature technology, light weight, and mass production.

Active Publication Date: 2018-04-24
DFINE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004]The receiver usually requires the filter to have good selectivity, the existing filter with Chebyshev response has a fixed cutoff frequency, and the selectivity is not high

Method used

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  • Electronically adjustable low-pass filter with generalized Chebyshev response
  • Electronically adjustable low-pass filter with generalized Chebyshev response
  • Electronically adjustable low-pass filter with generalized Chebyshev response

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Embodiment Construction

[0021] An electrically adjustable low-pass filter with generalized Chebyshev response, the substrate includes upper metal 1 from top to bottom, dielectric 2, metal ground 3, metallized through holes 111 and metallized through holes 112 that penetrate the substrate up and down, Metallized through hole 113, and varactor diode 121, varactor diode 122, varactor diode 123, chip capacitor 131, chip capacitor 132, chip capacitor 133, bias resistor 141, bias resistor soldered above the substrate 142, a bias resistor 143; the upper layer metal 1 includes an input and output feeder 151, an input and output feeder 152, an inductance line 161, an inductance line 162, an inductance line 163, a bias line 171, a bias line 172, and a bias line 173.

[0022] The input and output feeder 151 is a microstrip line of 50 ohms, and its right end is connected to the left end of the inductance line 161. The inductance line 161 is a microstrip line, and the width of the input and output feeder 151 gradu...

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Abstract

The invention is an electrically adjustable low-pass filter with generalized Chebyshev response, which solves the problems of fixed cut-off frequency and low selectivity of the existing low-pass filter. The substrate includes upper layer metal (1), medium (2), and metal ground (3) from top to bottom, and the substrate has a first metallization through hole (111) penetrating the substrate up and down, a second metallization through hole (112 ), the third metallized through hole (113), the first varactor diode (121), the second varactor diode (122), the third varactor diode (123), the first patch capacitor ( 131), the second chip capacitor (132), the third chip capacitor (133), the first bias resistor (141), the second bias resistor (142), the third bias resistor (143), the upper metal There are first input and output feeder (151), second input and output feeder (152), first inductance line (161), second inductance line (162), third inductance line (163), first bias line (171 ), the second bias line (172), the third bias line (173), the first input and output feed line (151) is a 50 ohm microstrip line, and its right end is connected to the left end of the first inductance line (161).

Description

Technical field: [0001] The invention belongs to the technical field of microwave and millimeter wave devices, in particular to an electrically adjustable low-pass filter in microwave and millimeter wave devices. Background technique: [0002] Highly integrated broadband universal receivers can be widely used in mobile communications, civil aviation, aerospace, maritime communications, scientific research and exploration, etc. The filter is a key device in the front end of the receiver, and there are usually a large number of filters and switches in the receiver to form a frequency preselection unit. This method increases the complexity of the system and increases the loss and volume of the system. Tunable filters can be used to replace these filter banks, thereby simplifying the receiver structure. [0003] Tunable filters are generally divided into two types, one is mechanically tuned, and the other is electrically tuned. Mechanical tuning needs to use motors to control...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H7/01
Inventor 程飞
Owner DFINE TECH
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