Microstrip bimodule band-pass filter based on DGS (defected ground structure) square-ring resonator

A ring resonator and filter technology, applied in waveguide-type devices, electrical components, circuits, etc., can solve problems such as difficult external coupling and bandwidth limitation, and achieve the effects of expanding bandwidth, increasing stopband bandwidth, and strong external coupling.

Inactive Publication Date: 2012-03-28
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technique is only applicable to the case of symmetrical frequency response, and the microstrip square ring resonator using the microstrip feeder slot coupling is not easy to achieve strong external coupling, so the bandwidth is limited

Method used

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  • Microstrip bimodule band-pass filter based on DGS (defected ground structure) square-ring resonator
  • Microstrip bimodule band-pass filter based on DGS (defected ground structure) square-ring resonator
  • Microstrip bimodule band-pass filter based on DGS (defected ground structure) square-ring resonator

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Experimental program
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Effect test

Embodiment 1

[0038] refer to figure 1 and Figure 4 , the present invention is mainly composed of a pair of input and output "T" shaped feeders 11, a microstrip dielectric substrate 12 and a DGS square ring resonator 18. in:

[0039] The microstrip dielectric substrate 12 is a double-sided copper-clad dielectric substrate with a dielectric constant of 9.6 and a thickness of 0.8 mm.

[0040] The DGS square ring resonator 18 is etched on the metal ground plate 13 below the microstrip dielectric substrate 12 , and consists of a square ring 14 , four square stepped impedance branches 15 and four square patches 16 . Side length L of square ring 24 1 =10mm, equal to a quarter of the waveguide wavelength, corresponding to the resonant frequency ε e is the effective dielectric constant of the slotted microstrip line, and the width w of the square ring 24 2 = 0.5mm; four square ladder impedance branches 15 are etched in the middle of the four sides of the square ring 14, by the length L 2 =...

Embodiment 2

[0044] refer to figure 1 and Figure 4 , the present embodiment is the same as Embodiment 1 except the following features: the perturbation patch 17 side length p=0.1mm, the reference patch side length r=1.7mm, the port connection feeder 111 width w=0.8mm, the coupling feeder 112 lengthL 3 =7mm, width w 3 =1mm, the relative distance between the inner side of the coupling feeder and the outer side of the square ring d=0.5mm.

[0045] In the present invention, because the distance between the two input and output "T" shaped feeders 11 is relatively long, the coupling between the source and the load is very weak, and there is a transmission zero point on both sides of the passband, which realizes a symmetrical filter frequency response, such as Figure 8 as shown, Figure 8 Medium|S 21 | is the transmission characteristic curve of the filter, |S 11 | is the reflection characteristic curve of filter 1 port. Depend on Figure 8 It can be seen that the filter has a symmetric...

Embodiment 3

[0047] refer to figure 2 and Figure 5 , the present invention is mainly composed of a pair of input and output "T" shaped feeders 21, a microstrip dielectric substrate 22 and a DGS square ring resonator 28. in:

[0048] The microstrip dielectric substrate 22 is a double-sided copper-clad dielectric substrate with a dielectric constant of 9.6 and a thickness of 0.8 mm.

[0049] The DGS square ring resonator 28 is etched on the metal ground plate 23 below the microstrip dielectric substrate 22 and consists of a square ring 24 , four triangular stepped impedance branches 25 and four triangular patches 26 . Side length L of square ring 24 1 =10mm, equal to a quarter of the waveguide wavelength, corresponding to the resonant frequency ε e is the effective dielectric constant of the slotted microstrip line, and the width w of the square ring 24 1 =1mm; four triangular ladder impedance branches 25 are etched in the middle of the four sides of the square ring 24, and the leng...

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Abstract

The invention discloses a microstrip bimodule band-pass filter based on a DGS (defected ground structure) square-ring resonator, in order to mainly solve the problems that the traditional microstrip bimodule filter is narrower in band width, and the transmission zero is difficult to control. The filter comprises a pair of an input/output 'T'-shaped feeder lines (11), a microstrip medium substrate (12) and a square bimodule resonator (18), wherein a square ring (14) is etched on a metal grounding plate (13) below the microstrip medium substrate (12); each step impedance branch knot (15) is etched at the middle parts of the four edges of the square ring; each paster (16) is etched in the four corners of the square ring (16), thus a DGS square ring bimodule resonator (18) is formed. The pair of the input/output 'T'-shaped feeder lines (11) is vertically placed above the microstrip medium substrate with each other, and extends into the resonator in parallel for power feed. According to the invention, external coupling can be intensified, band width can be expanded, symmetrical and unsymmetrical high-inhibition band pass filter frequency response is realized, and the filter can be used for wireless communication systems.

Description

technical field [0001] The invention belongs to a microstrip device, relates to a microstrip double-mode band-pass filter, which can be used for a radio frequency front end of a wireless communication system. Background technique [0002] With the rapid development of mobile communication, satellite communication, radar, and remote sensing technology, the wireless spectrum is increasingly crowded, which puts forward very strict requirements on the radio frequency microwave filter in the communication system. Microstrip filters have the advantages of small size, light weight, low cost, and easy processing, and are widely used in microwave circuits. There are various types and realization forms of microstrip filters, and the research of miniaturized high-performance microstrip filters has always been a hot field. Traditional filter forms such as Butterworth and Chebyshev filters can only meet high selectivity requirements by increasing the number of filter stages, and the pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/212
Inventor 吴边苏涛张永亮付森梁昌洪
Owner XIDIAN UNIV
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