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Multi-zero-point compact microstrip filter

A microstrip filter, compact technology, applied in the direction of waveguide devices, electrical components, circuits, etc., can solve the problems of large volume, low out-of-band suppression, uncontrollable zero point, etc., to achieve small size, compact structure, and easy integration Effect

Inactive Publication Date: 2016-04-20
PANDA ELECTRONICS GROUP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the defects of low out-of-band rejection, large volume, and uncontrollable zero point of the existing microstrip filter, the present invention proposes a microstrip line filter with multiple out-of-band transmission zeros, miniaturization and high out-of-band rejection

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Embodiment Construction

[0024] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0025] like figure 1 As shown, the filter is implemented on RogersR4350 with a thickness of 0.508mm, a dielectric constant of 3.66, and a tangent loss of 0.002 as the substrate material. The front side is the filter circuit, and the back side is a copper-clad ground plane. The circuit network microstrip structure of the filter includes an input transmission line 1, an output transmission line 2, and four quarter-wavelength sector-shaped stepped impedance resonators (λ / 4 sector-shaped SIR). The input and output of the filter adopt the way of direct feeding, and the characteristic impedance of the input and output microstrip lines is 50Ω. In order to make the resonator more compact, the low impedance line in the resonator is also folded into an arc shape with a central angle of π / 4, that is, the first arc impedance line 7, the second arc imped...

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Abstract

The present invention discloses a multi-zero-point compact microstrip filter which comprises an upper microstrip structure, an intermediate dielectric substrate, and a bottom layer metal plate. The upper microstrip structure comprises an input end transmission wire, an output end transmission wire, a first impedance resonator, a second impedance resonator, a third impedance resonator and a fourth impedance resonator. The first impedance resonator comprises a first arc impedance wire and a first fan-shaped impedance wire. The second impedance resonator comprises a second arc impedance wire and a second fan-shaped impedance wire. The third impedance resonator comprises a third arc impedance wire and a third fan-shaped impedance wire. The fourth impedance resonator comprises a fourth arc impedance wire and a fourth fan-shaped impedance wire. According to the needs of actual conditions, a filter parameter is adjusted to change the position of the transmission zero point, the effect of effectively filtering system out-band noise in a targeted way is achieved, and the multi-zero-point compact microstrip filter has the advantages of high out-band inhibition characteristic, compact structure, small size, easy processing, and easy integration.

Description

technical field [0001] The invention relates to a multi-zero compact microstrip filter, which belongs to the technical field of microwave communication. Background technique [0002] Filters are the key to many design problems in many radio systems. Filters can split and recombine frequencies; they can reduce crosstalk between different functional circuits; There are also networks like filters in circuits designed for output power. [0003] As the wireless communication system develops towards the direction of miniaturization and multi-function, the filter is also required to develop towards the direction of miniaturization and high performance. The high performance of the filter is mainly manifested in its out-of-band suppression characteristics. The traditional filter achieves the excellent out-of-band suppression characteristics of the filter by increasing the number of resonators, which will increase the volume of the system and increase the system loss. Nowadays, peop...

Claims

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Application Information

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IPC IPC(8): H01P1/203
CPCH01P1/203
Inventor 张鸣霞姚兴强
Owner PANDA ELECTRONICS GROUP
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