{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,17]],"date-time":"2026-03-17T19:04:16Z","timestamp":1773774256430,"version":"3.50.1"},"reference-count":24,"publisher":"Wiley","issue":"10","license":[{"start":{"date-parts":[[2025,3,6]],"date-time":"2025-03-06T00:00:00Z","timestamp":1741219200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Circuit Theory &amp;amp; Apps"],"published-print":{"date-parts":[[2025,10]]},"abstract":"<jats:title>ABSTRACT<\/jats:title><jats:p>This paper proposes two novel modes based on input\u2013output waveform engineering and a compact dual\u2010band output matching network (DB OMN) with two adjustable transmission zeros (TZs), for the design of dual\u2010band power amplifiers (DBPAs) with large frequency ratio. For the first time, the two modes considering input nonlinearity of the transistor are leveraged to construct two new expanded optimum drain load impedance spaces (DLISs), thereby reducing the complexity of designing DB OMNs. Based on this, the maximum frequency ratio of the proposed DB OMN can theoretically reach 7.6. Additionally, two adjustable TZs can be produced, and its frequency ratio is confirmed in the range from 1.6 to 7.6. For demonstration, a prototype operating at 0.7 and 2.64\u2009GHz is implemented with frequency ratio of 3.8, and two TZs at 0.9 and 2.08\u2009GHz are purposefully introduced. Measured results show that the DBPA exhibits the power added efficiencies (PAEs) of 83.2% and 70.9% with output powers of 41.9 and 40.9\u2009dBm at 0.7 and 2.64\u2009GHz, respectively. Meanwhile, the output powers of only 1.9 and \u22128.1\u2009dBm are obtained at 0.9 and 2.08\u2009GHz, respectively.<\/jats:p>","DOI":"10.1002\/cta.4513","type":"journal-article","created":{"date-parts":[[2025,3,11]],"date-time":"2025-03-11T11:40:55Z","timestamp":1741693255000},"page":"5626-5637","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Dual\u2010Band Input\u2013Output Waveform Engineered High\u2010Efficiency Power Amplifier With Large Frequency Ratio and Adjustable Transmission Zeros"],"prefix":"10.1002","volume":"53","author":[{"given":"Zhenghua","family":"Wei","sequence":"first","affiliation":[{"name":"The College of Electrical and Information Engineering Hunan University  Changsha China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6046-8161","authenticated-orcid":false,"given":"Qiang","family":"Liu","sequence":"additional","affiliation":[{"name":"The 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