{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,9]],"date-time":"2026-03-09T00:16:49Z","timestamp":1773015409010,"version":"3.50.1"},"reference-count":19,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2025,5,19]],"date-time":"2025-05-19T00:00:00Z","timestamp":1747612800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"},{"start":{"date-parts":[[2025,5,19]],"date-time":"2025-05-19T00:00:00Z","timestamp":1747612800000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Circuit Theory &amp; Apps"],"published-print":{"date-parts":[[2026,2]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>This paper presents a novel design method of quasi\u2010optimal rat\u2010race coupler with arbitrary port impedance. The arbitrariness of the port impedance is fully considered in the design of the rat\u2010race coupler, which can avoid the additional configuration of matching network when connecting with other components. An integrated design equation for the rat\u2010race coupler is derived using the even\u2013odd mode method. Combined with the quasi\u2010optimal theory, the dual\u2010band, broadband, and compact design methods of arbitrary port impedance rat\u2010race coupler are proposed, and the different characteristics can be achieved by only adjusting the parameters without any structure change. Three rat\u2010race couplers are fabricated using double\u2010sided parallel\u2010strip line (DSPSL) for experimental verification, and the results are in great agreement with the theory.<\/jats:p>","DOI":"10.1002\/cta.4574","type":"journal-article","created":{"date-parts":[[2025,5,19]],"date-time":"2025-05-19T03:20:29Z","timestamp":1747624829000},"page":"808-816","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Quasi\u2010optimal Rat\u2010Race Coupler Design With Arbitrary Port Impedance"],"prefix":"10.1002","volume":"54","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-0660-3677","authenticated-orcid":false,"given":"Haoyang","family":"Shi","sequence":"first","affiliation":[{"name":"Air Force Engineering University  Xi'an China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xuchun","family":"Zhang","sequence":"additional","affiliation":[{"name":"Air Force Engineering University  Xi'an 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