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Double-pass wide-stop-band filter based on defected ground structure

A defect structure and filter technology, which is applied in the field of filters, can solve the problems of large influence of parasitic passbands and large size of filters, and achieve the effects of improving filtering performance, increasing stopband width, and reducing costs

Pending Publication Date: 2022-07-29
HUADONG PHOTOELECTRIC TECHN INST OF ANHUI PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The structure of this method is relatively simple, the design idea is similar to the design of single passband filter and the filter parameters are easy to adjust, but the filter designed by this method often has a large size, and the generated parasitic passband has a great influence

Method used

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  • Double-pass wide-stop-band filter based on defected ground structure
  • Double-pass wide-stop-band filter based on defected ground structure
  • Double-pass wide-stop-band filter based on defected ground structure

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Embodiment

[0047] This embodiment takes the structure of a 3.3GHz-3.5GHz and 5.8GHz-6.1GHz double-pass filter as an example, wherein the dielectric constant of the dielectric layer 2 is 4.4 and the thickness is 1.6mm. like figure 2 and image 3 As shown, the size parameters of each structure on the filter layer 3 in the filter are as follows: W=17mm, W1=3mm, W2=1mm, W3=8mm, W4=3.8mm, W5=6mm, W6=1.2mm, W7 =1.28mm, W8=6.36mm, W9=2.4mm, W10=9.95mm, L=22.3mm, L1=9.1mm, L2=1mm, L3=5.5mm, L4=mm, L5=1mm, L6=0.55mm , L7=5.6mm, L8=1.65mm, L9=7.8mm, L10=5.5mm. The size of the low-pass filter is 22.3mm×17mm, and the filter has better miniaturization advantages.

[0048] Figure 4 The parameter simulation diagram of S11 and S12 obtained after the filter of the above structure and size is simulated and modeled in the electromagnetic software. It can be seen from the figure that the passband frequency of the filter is 3.23GHz-3.51GHz and 5.79GHz-6.28 GHz, in the passband, the in-band insertion l...

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Abstract

The invention discloses a defected ground structure-based dual-pass wide-stop-band filter, which comprises a grounding layer, a dielectric layer and a filtering layer which are sequentially arranged from bottom to top, and is characterized in that a signal input port and a signal output port are respectively positioned at two ends of the filtering layer; the two open rectangular resonant rings are symmetrically arranged in the middle of the filtering layer and are respectively connected with the signal input port and the signal output port, and the two open rectangular resonant rings are arranged at an interval and are coupled; an L-shaped coupling line pair is loaded and connected in each open rectangular resonant ring, a pair of symmetrical non-feed branch pairs is arranged on the outer side of each L-shaped coupling line pair, and the non-feed branch pairs are not connected with the feed structure; rectangular defect pairs and defect blocks are formed on the grounding layer, the symmetry axis of the rectangular defect blocks coincides with the longitudinal symmetry axis of the lower layer of the dielectric layer, the rectangular defect pairs are symmetrical about the longitudinal symmetry axis of the lower layer of the dielectric layer, and the defect blocks are located between the defect pairs to form a band stop structure. The filter is simple in overall structure, small in size, low in processing cost and wide in application.

Description

technical field [0001] The present invention relates to the technical field of filters, in particular, to a double-pass bandwidth stop-band filter based on a defective ground structure. Background technique [0002] A microstrip filter is a device used to separate microwave signals of different frequencies. Its main function is to suppress unwanted signals so that they cannot pass through the filter and only let the desired signals pass. In the microwave circuit system, the performance of the filter has a great influence on the performance index of the circuit, so how to design a filter with high performance is of great significance to the design of the microwave circuit system. Microstrip circuits have many advantages, such as small size, light weight and wide frequency band. They have been widely used in microwave circuit systems in recent years, and the use of microstrip as filters is one of its main applications. [0003] With the rapid development of wireless communic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/203
CPCH01P1/203
Inventor 张娟叶明旭赵亮查放吴昊卢梦明杭杰
Owner HUADONG PHOTOELECTRIC TECHN INST OF ANHUI PROVINCE
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