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Open AccessArticle

Monolithic Miniaturized Differentially-Fed Branch-Line Directional Coupler in GaAs Monolithic Technology

1
Department of Electronics, AGH University of Science and Technology, 30-059 Krakow, Poland
2
School of Electronics and Information, Northwestern Polytechnical University, Xi’an 710072, China
*
Author to whom correspondence should be addressed.
Electronics 2020, 9(3), 446; https://doi.org/10.3390/electronics9030446
Received: 5 February 2020 / Revised: 27 February 2020 / Accepted: 4 March 2020 / Published: 6 March 2020
(This article belongs to the Special Issue RF, Microwave and Millimeter Wave Devices and Integrated Systems)
In this paper, a design of a miniaturized branch-line directional coupler is presented. The coupler is designed with balanced coupled-line sections, which are electrically shortened by the application of lumped capacitors. To measure the parameters of the coupler, appropriate baluns have been designed. The coupler has been designed in a GaAs PH25 UMS (united monolithic semiconductor) technology with the center frequency of 24 GHz. The measured power split equals 3 dB with the transmission/coupling imbalance not exceeding 0.6 dB. The measured return losses equal 17 dB at the center frequency, whereas the isolation reaches 17 dB. The fabricated coupler‘s size equals 630 um × 487 um, which is 0.19 of the full size of the directional coupler in the chosen technology (1191 um × 1170 um). View Full-Text
Keywords: directional couplers; differential couplers; hybrid couplers; branch-line couplers; MMIC couplers directional couplers; differential couplers; hybrid couplers; branch-line couplers; MMIC couplers
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MDPI and ACS Style

Gruszczynski, S.; Smolarz, R.; Wu, C.; Wincza, K. Monolithic Miniaturized Differentially-Fed Branch-Line Directional Coupler in GaAs Monolithic Technology. Electronics 2020, 9, 446. https://doi.org/10.3390/electronics9030446

AMA Style

Gruszczynski S, Smolarz R, Wu C, Wincza K. Monolithic Miniaturized Differentially-Fed Branch-Line Directional Coupler in GaAs Monolithic Technology. Electronics. 2020; 9(3):446. https://doi.org/10.3390/electronics9030446

Chicago/Turabian Style

Gruszczynski, Slawomir; Smolarz, Robert; Wu, Changying; Wincza, Krzysztof. 2020. "Monolithic Miniaturized Differentially-Fed Branch-Line Directional Coupler in GaAs Monolithic Technology" Electronics 9, no. 3: 446. https://doi.org/10.3390/electronics9030446

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