Bandwidth improvement of rat‐race couplers having left‐handed transmission‐line sections |
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Authors: | Jakub Sorocki Ilona Piekarz Krzysztof Wincza Slawomir Gruszczynski |
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Affiliation: | AGH University of Science and Technology, , 30‐059 Cracow, Poland |
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Abstract: | A novel broadband rat‐race coupler has been investigated. The coupler utilizes an artificial left‐handed transmission line section for broadband phase response realization. Moreover, a narrowband model of left‐handed section has been shown to prove the couplers equivalent circuit at the center frequency. To broaden the operational bandwidth multisection quarter‐wave transformers have been proposed. The exemplary rat‐race coupler with two‐section impedance transformers has been designed and manufactured. © 2013 Wiley Periodicals, Inc. Int J RF and Microwave CAE 24:341–347, 2014. |
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Keywords: | broadband rat‐race couplers left‐handed transmission lines impedance transformers |
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