A High Directivity Microstrip Coupler Based on Reflective Resistors
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Date
2024-04
Authors
Guo, L.
Wei, Y. J.
Shi, Y. P.
Zou, X. J.
Wang, G. M.
ORCID
Advisor
Referee
Mark
Journal Title
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Volume Title
Publisher
Společnost pro radioelektronické inženýrství
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Abstract
In this paper, a novel high-directivity microstrip coupler based on reflective resistors is presented. The proposed coupler consists of three pairs of coupled-line sections and one pair of resistors. Generally, the coupling degree can be controlled by the coupled-lines, while the resistors are employed to adjust the amplitude of the reflected signal to cancel out the leakage signal. The mechanism of high directivity is derived and the S-parameters are presented. To verify the design concept, a 20 dB microstrip coupler operating at 2 GHz is processed and measured. The measured results indicate that the return loss of input and output ports is more than 28.5 dB with a typical insert loss of 0.3 dB, while that of coupled and isolated ports is more than 15 dB. And the directivity is more than 20 dB with a maximum 53.1 dB at 2.01 GHz in a fractional bandwidth of 22.5%.
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Citation
Radioengineering. 2024 vol. 33, iss. 1, s. 121-126. ISSN 1210-2512
https://www.radioeng.cz/fulltexts/2024/24_01_0121_0126.pdf
https://www.radioeng.cz/fulltexts/2024/24_01_0121_0126.pdf
Document type
Peer-reviewed
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Published version
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Language of document
en