A microstrip filter based on transversal section of parallel-coupled line with U-shaped slot for wideband and notch response

Background: A compact complex impedance-transforming balun for UHF frequencies, which is based on a coupled-line structure that matched all ports and provided high output port isolation, was designed in this paper. Methods: A lumped component transformation was used to minimize circuit size. The implemented circuit operated at 433 MHz with the reflection coefficients less than -16 dB at all ports, 0.22 dB amplitude balance and 180° phase balance at the output ports. The signal coupling between the output ports was -16.8 dB. The circuit size is small at 0.032λ. Results: Complex impedance-transforming baluns were designed to operate at 433 MHz. The source impedance at port 1 was set at Zs = 12 - j12Ω and the load impedances at port 2 and 3 were set at ZL = 80 + j30Ω. Conclusion: A compact complex impedance-transforming balun at UHF frequency, with all ports matched and high isolations, was designed and illustrated in this paper.

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Novel Dual-Band Bandpass Filters Using Short-Circuited Coupled-Line Resonator

2020 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP) ◽

10.1109/imws-amp49156.2020.9199672 ◽

2020 ◽

Author(s):

Wei Nie ◽

Zhi Chao Han ◽

Ying Hao Wang ◽

Liang Bo Xie ◽

Mu Zhou

Keyword(s):

Bandpass Filters ◽

Dual Band ◽

Coupled Line

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A Flat-Passband Microstrip Filter With Nonuniform- Dual-Mode Resonators

IEEE Microwave and Wireless Components Letters ◽

10.1109/lmwc.2016.2525017 ◽

2016 ◽

Vol 26 (3) ◽

pp. 183-185 ◽

Cited By ~ 8

Author(s):

Liang-Feng Qiu ◽

Lin-Sheng Wu ◽

Wen-Yan Yin ◽

Jun-Fa Mao

Keyword(s):

Dual Mode ◽

Microstrip Filter

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Couplinator: A simple computational tool for synthesis of multi-section coupled-line filter based on MPCM-TLM technique

International Journal of Microwave and Wireless Technologies ◽

10.1017/s1759078721000167 ◽

2021 ◽

pp. 1-10

Author(s):

E. Faghand ◽

S. Karimian ◽

E. Mehrshahi ◽

N. Karimian

Keyword(s):

Comparative Analysis ◽

Transmission Line ◽

High Frequency ◽

Computational Tool ◽

Cad Tools ◽

Coupled Line ◽

High Frequency Structure Simulator ◽

Transmission Line Method ◽

Set Up ◽

Planar Circuit

Abstract A new simple computational tool is proposed for the synthesis of multi-section coupled-line filters based on combined modified planar circuit method (MPCM) and transmission line method (TLM) analysis, referred to as MPCM-TLM. Due to its fundamentally simple architecture, the presented tool offers significantly faster optimization of coupled-line filters – for exactly the same initial simulation set-up – than other costly commercially-available tools, giving equally reliable results. Validity and accuracy of the proposed tool have been verified through the design of 3rd, 5th, and 7th order coupled-line filters and comparative analysis between results obtained from the proposed approach and the high-frequency structure simulator. A remarkable 99% time reduction in the analysis is recorded in the case of 7th order filter using the proposed tool, for almost identical results to HFSS. Therefore, it can be confidently claimed that the proposed technique can be used as a reliable alternative to existing complex, costly, processor-intensive CAD tools.

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