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Differential Bi-Level Microstrip Directional Coupler with Equalized Coupling Coefficients for Directivity Improvement

Department of Electronics, AGH University of Science and Technology, 30-059 Krakow, Poland
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Electronics 2020, 9(4), 547; https://doi.org/10.3390/electronics9040547
Received: 10 March 2020 / Revised: 20 March 2020 / Accepted: 23 March 2020 / Published: 25 March 2020
(This article belongs to the Special Issue RF/Mm-Wave Circuits Design and Applications)
In this paper, a bi-level microstrip differential directional coupler has been investigated. It has been shown that the equalization of coupling coefficients can be successfully made with the use of appropriate dielectric stack-up and conductor geometry. The application of additional top dielectric layer can ensure proper equalization of coupling coefficients by lowering the value of capacitive coupling coefficient to the value of the inductive one. The theoretically investigated coupled-line section has been used for the design of a 3-dB differential directional coupler. The measurement results are compared with the theoretical ones. View Full-Text
Keywords: directional couplers; differential mode circuits; balanced directional couplers; coupled lines directional couplers; differential mode circuits; balanced directional couplers; coupled lines
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Gruszczynski, S.; Smolarz, R.; Wincza, K. Differential Bi-Level Microstrip Directional Coupler with Equalized Coupling Coefficients for Directivity Improvement. Electronics 2020, 9, 547.

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