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A Miniaturized Wide Rejection Band Low-Pass Microstrip Filter

A technology of microstrip filter and suppression band, which is applied in the field of filters, can solve the problems of insufficient compactness of the overall structure, increase in the size of the filter, and unreasonable layout of the printed circuit board. The effect of small size and low processing cost

Active Publication Date: 2022-07-22
HUADONG PHOTOELECTRIC TECHN INST OF ANHUI PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing low-pass filters pay more attention to the loss reduction of the passband, but in engineering applications, the low-pass filter with a wide stopband can achieve better results and filter out wider clutter, but the existing In order to improve the out-of-band rejection of the low-pass filter, the overall size of the entire filter is often increased due to the unreasonable layout of the printed circuit board after selecting the corresponding filter, making the overall structure not compact enough

Method used

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  • A Miniaturized Wide Rejection Band Low-Pass Microstrip Filter
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  • A Miniaturized Wide Rejection Band Low-Pass Microstrip Filter

Examples

Experimental program
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Embodiment 1

[0038] This embodiment takes the structure of a 0-8G low-pass filter as an example, in which the dielectric constant of the dielectric substrate is 3.55 and the thickness is 0.8128 mm. like figure 2 As shown, the size parameters of the structures on the etched circuit layer 3 in the filter are as follows: W1=2mm, L1=5.6mm, W2=0.3mm, L2=4.7mm, W3=0.4mm, L3=0.4mm, W4=3.4mm, L4=2.3mm, W5=0.6mm, L5=2.1mm, W6=0.05mm, L6=1.85mm, R1=1.4mm, R2=3mm, θ 1 =0.18π, θ 2 =0.18π. The size of the low-pass filter is 15.8mm×8mm, and the filter has the advantage of better miniaturization.

[0039] like image 3 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 cut-off frequency of the filter is 8.21GHz, and in the passband, from DC to In the range of 7.59GHz, the in-band insertion loss is less than 1dB, thus achieving better in-band transm...

Embodiment 2

[0041] The difference between this embodiment and Embodiment 1 lies in the dimension parameters of the partial structures on the etched circuit layer 3 in the filter. like figure 2 As shown, the size parameters of each structure on the etched circuit layer 3 in the filter are as follows: W1=1.6mm, L1=5.6mm, W2=0.3mm, L2=4.7mm, W3=0.4mm, L3=0.4mm , W4=3.4mm, L4=2.3mm, W5=0.6mm, L5=1.85mm, W6=0.05mm, L6=5.42mm, R1=1.2mm, R2=3mm, θ 1 =0.16π, θ 2 =0.16π. The size of the low-pass filter is 15.8mm×8mm, and the filter has the advantage of better miniaturization.

[0042] like 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 cut-off frequency of the filter is 8.15GHz, in the passband, from DC to In the range of 7.82GHz, the in-band insertion loss is less than 1dB, and the S12 in the passband is basically less than 20...

Embodiment 3

[0044] The difference between this embodiment and Embodiment 1 lies in the dimension parameters of the partial structures on the etched circuit layer 3 in the filter. like figure 2 As shown, the size parameters of the structures on the etched circuit layer 3 in the filter are as follows: W1=1.6mm, L1=5.6mm, W2=0.5mm, L2=4.7mm, W3=0.9mm, L3=0.4mm , W4=3.4mm, L4=2.3mm, W5=0.6mm, L5=1.85mm, W6=0.05mm, L6=5.42mm, R1=1.4mm, R2=3mm, θ 1 =0.18π, θ 2 =0.18π. The size of this low-pass filter is 15.8mm x 8mm ， The filter has better miniaturization advantages

[0045] like Figure 5 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 cut-off frequency of the filter is 8.11GHz, and in the passband, from DC to In the range of 7.65GHz, the in-band insertion loss is less than 1dB, thus achieving better in-band transmission performance....

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Abstract

A miniaturized wide-suppression-band low-pass microstrip filter belongs to the technical field of filters. The filter includes a ground layer, a dielectric substrate and an etched circuit layer sequentially arranged from bottom to top, and the etched circuit layer includes a signal input port , signal output port, multi-bend resonator and open-circuit branch module, signal input port and signal output port are respectively connected with multi-bend resonator, two multi-bend resonators are connected by signal transmission line, and the two multi-bend resonators are connected by signal transmission line. The open-circuit branch modules are respectively arranged on the sides, and the beneficial effects of the present invention are that the overall structure of the filter involved in the present invention is simple, the size is small, the processing cost is low, and the filter has the characteristics of low passband loss and suppressed bandwidth, and can be applied to a wider range of filtering requirements. clutter in microwave circuits.

Description

technical field [0001] The invention relates to the technical field of filters, in particular to a miniaturized wide-suppression-band low-pass microstrip filter. Background technique [0002] A filter is a device that filters waves. It is essentially a frequency selection circuit that allows signals of useful frequencies to pass smoothly, and blocks signals of useless frequencies from passing through, so as to filter frequencies. Function. The process of filtering is the process of extracting the information carried by the original signal from the signal distorted and polluted by noise. The result of filtering is to get a specific frequency or to eliminate a specific frequency. [0003] Filters can be classified into low-pass filters, high-pass filters, band-pass filters, and band-stop filters according to the frequency of the filtered signal. Low-pass filtering is one of the filtering methods. The low-pass filter uses the principle that capacitors pass high frequencies a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/212H01P1/203
CPCH01P1/212H01P1/203
Inventor 张娟席洪柱曹振玲郑君俞畅
Owner HUADONG PHOTOELECTRIC TECHN INST OF ANHUI PROVINCE