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T type source load-coupled transmission zero adjustable band-pass filter

A technology of source-load coupling and transmission zero point, applied in waveguide-type devices, electrical components, circuits, etc., can solve problems such as changing the passband selectivity, and achieve the effect of high frequency selection performance, low cost, and adjustable characteristics.

Inactive Publication Date: 2018-06-05
NANJING UNIV OF INFORMATION SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such a weak coupling structure cannot be changed after the circuit is fixed, and the passband selectivity cannot be changed according to actual needs.

Method used

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  • T type source load-coupled transmission zero adjustable band-pass filter
  • T type source load-coupled transmission zero adjustable band-pass filter
  • T type source load-coupled transmission zero adjustable band-pass filter

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Embodiment Construction

[0015] The present invention will be further described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0016] Such as figure 1 As shown, the transmission zero-point electrically adjustable bandpass filter structure based on source-load coupling in the present invention includes a first input / output port 1, a second input / output port 2, an intermediate layer dielectric substrate, and the dielectric board and the lower two surfaces Metal surface circuit structure.

[0017] The circuit structure of the upper metal surface of the filter dielectric board is as follows: figure 2 As shown, it consists of a first input / output port, a second input / output port, an interlayer dielectric substrate, an upper layer microstrip structure arranged on the upper surface of the interlayer dielectric substrate, and a bottom metal floor arranged on the bottom surface of the interlayer dielectric substrate; The upper layer microstrip structure in...

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Abstract

The invention discloses a T type source load-coupled transmission zero adjustable band-pass filter which comprises a first input / output port, a second input / output port, a middle-layer media substrate, an upper-layer micro-band structure, and a bottom-layer metal floor, wherein the upper-layer micro-band structure is arranged on the upper surface of the middle-layer media substrate, and the bottom-layer metal floor is arranged on the bottom surface of the middle-layer media substrate; the upper-layer micro-band structure consists of a first parallel coupling line network, a middle short circuited stub-loaded resonator, a T type source load-coupled network and a second parallel coupling line network. Source load coupling can be realized by adopting T type network, the capacitance of a variable-capacitance diode in the T type network can be controlled by external voltage, the electronic speed controller characteristic of the source load coupling can be realized, so that the adjustabilityof out-of-band transmission zero can be realized, the filtering performance with different passing band selectivity and stopband suppression characteristics can be provided.

Description

technical field [0001] The invention belongs to the technical field of radio frequency filters in wireless communication, and more specifically relates to a transmission zero-point adjustable band-pass filter based on T-type source-load coupling. Background technique [0002] With the continuous maturity of 4G technology and the gestation and development of 5G technology, the requirements of modern communication technology for hardware are increasing day by day. Due to the rapid increase of communication frequency, the frequency of electromagnetic interference is also getting higher and higher, and the interference frequency usually reaches GHz, or even hundreds of GHz or more. Since the higher the frequency of the voltage or current, the easier it is to generate radiation. It is these very high frequency interference signals that cause the problem of radiation interference to become more and more serious. Therefore, in order to extract effective signals from complex signal...

Claims

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Application Information

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IPC IPC(8): H01P1/203
Inventor 吴小虎许文涛葛俊祥王勇丁佳录刘莉马贝宁顾希雅
Owner NANJING UNIV OF INFORMATION SCI & TECH
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