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Filtering balun

A feeder and port technology, applied in the field of wireless communication, can solve the problems of poor filter balun passband performance, insufficient passband bandwidth, complex structure, etc.

Active Publication Date: 2021-07-06
CHENGDU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The defects and deficiencies of the prior art include: the achievable passband bandwidth is not wide enough; the performance of the filter balun in the passband is not good, and the insertion loss is large; the stopband characteristics of the filter balun are not good; the size of the filter balun is not compact enough , complex structure, high processing cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] In this example, if figure 1 , Figure 8 As shown, the present invention provides a filtering balun, which includes a dielectric substrate 6, a metal floor 7 is arranged under the dielectric substrate 6, and a ring resonator 1 and a port feeder are etched on the dielectric substrate 6, The port feeder is arranged on the outside of the ring resonator 1, and at least one etching structure 11 is provided on the inside of the ring resonator 1; there is a gap between the outside of the ring resonator 1 and the port feeder;

[0043] The port feeder includes a first port feeder 2, a second port feeder 3 and a third port feeder 4, and the first port feeder 2, the second port feeder 3 and the third port feeder 4 are all provided with a first loading structure 5;

[0044] A perturbation 12 is provided inside the ring resonator 1 .

[0045] The boundary of the resonator is a microstrip transmission line. When the width of the microstrip transmission line is consistent throughout,...

Embodiment 2

[0053] A filter balun is provided, the ring resonator 1 is a regular polygonal resonant ring, specifically, as figure 2 As shown, taking a regular hexagonal resonant ring as an example, and the structure of the ring resonator 1 is symmetrical based on at least one diagonal line; the first port feeder 2, the second port feeder 3 and the third port feeder 4 are all straight line, the first port feeder 2 is an input port feeder, the second port feeder 3 and the third port feeder 4 are both output port feeders, and the first port feeder 2, the second port feeder 3 and the third port feeder 4 are set respectively On the outer side corresponding to the three sides of the regular polygonal resonant ring, the second port feeder 3 and the third port feeder 4 are respectively located on two sides of the first port feeder 2 .

[0054] The perturbation 12 is arranged at an inner corner of a regular polygonal resonant ring corresponding between the first port feeder 2 and the second port ...

Embodiment 3

[0057] On the basis of Embodiment 2, a filtering balun is provided, such as image 3 As shown, the second port feeder 3 and the third port feeder 4 are respectively arranged on both sides adjacent to the first port feeder 2, the first port feeder 2 is an input port feeder, and the second port feeder 3 and the third port feeder 4 are output port feeders.

[0058] Let the two output port feeders be arranged on both sides adjacent to the input port feeder, so that the ports are closer to each other, which facilitates the design and improves the performance of the balun.

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Abstract

The invention belongs to the technical field of wireless communication, and particularly discloses a filtering balun which comprises a dielectric substrate, a port feeder line and an annular resonator are etched on the dielectric substrate, the port feeder line is arranged on the outer side of the annular resonator, an etching structure is arranged on the inner side of the annular resonator, and the annular resonator with non-uniform impedance is formed; the port feeder passes through the gap and is loaded with the rectangular stub to realize strong coupling with the non-uniform ring resonator, and the physical size of the feeder is adjusted to control the coupling strength between the feeder and the non-uniform ring resonator, so that a good passband characteristic is realized, namely a good filtering characteristic is realized. The adjustment flexibility can be further improved by loading the branch on the feeder line, the perturbation is arranged at one corner of the annular resonator, the size of the perturbation is adjusted, the positions of two modes in a passband are controlled, the rectangular branch is arranged on the perturbation, the flexibility of adjusting the positions of the two modes by the perturbation is improved, the bandwidth can be controlled, and the out-of-band characteristic of the filtering balun can be improved.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a filtering balun. Background technique [0002] With the rapid development of wireless communication technology, higher requirements are put forward for wireless communication equipment, and high reliability, miniaturization, and good electromagnetic compatibility have become the future development trend. The integrated design of the filter and the balun can not only effectively reduce the overall size of the RF front-end system, but also reduce the loss and improve the overall performance of the system. [0003] The defects and deficiencies of the prior art include: the achievable passband bandwidth is not wide enough; the performance of the filter balun in the passband is not good, and the insertion loss is large; the stopband characteristics of the filter balun are not good; the size of the filter balun is not compact enough , complex structure and high proces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P5/10H01P1/20
CPCH01P5/10H01P1/20
Inventor 高山山刘玉双孙胜史洋一赵永鑫李跃鹏
Owner CHENGDU UNIV
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