{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,6]],"date-time":"2026-01-06T13:43:22Z","timestamp":1767707002793,"version":"build-2065373602"},"reference-count":37,"publisher":"Institution of Engineering and Technology (IET)","issue":"4","license":[{"start":{"date-parts":[[2023,7,26]],"date-time":"2023-07-26T00:00:00Z","timestamp":1690329600000},"content-version":"vor","delay-in-days":25,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100002186","name":"Lockheed Martin","doi-asserted-by":"publisher","award":["MRA17\u2010003\u2010RPP025"],"award-info":[{"award-number":["MRA17\u2010003\u2010RPP025"]}],"id":[{"id":"10.13039\/100002186","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["ietresearch.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["IET Circuits, Devices &amp;amp; Syst"],"published-print":{"date-parts":[[2023,7]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>This paper presents simulation and measurement results of a 2\u20134\u00a0GHz octave bandwidth interference suppression circuit. The circuit accomplishes the function of a tunable frequency notch through an interferometer architecture. The relative delay in the interferometer paths is varied with GaN monolithic microwave integrated circuit tunable delay lines. The delay is adjusted by varying the drain voltage of cold\u2010FET connected high electron mobility transistors acting as varactors. Two types of periodically\u2010loaded delay lines are compared: a uniform and a tapered design. A simple theoretical study, relating the delays and amplitudes in the interferometer circuit branches, is developed to inform the design. Two interference suppression hybrid circuits are implemented, and measurements demonstrate a 25\u201340\u00a0dB notch across the 2.24\u20134\u00a0GHz range for the uniform delay line, and 2.32\u20134.13\u00a0GHz for the tapered design. The return loss for both designs remains below 10\u00a0dB. Measurements with two tones spaced 0.5 and 1\u00a0GHz for varying tone power are performed to quantify suppression. The circuit can handle an input power of 37\u00a0dBm and maintains performance with two simultaneous 25\u00a0dBm tones spaced 0.5\u00a0GHz apart. Linearity is characterised with 10\u00a0MHz two\u2010tone measurements, and the circuit demonstrates a 3rd\u2010order intercept input power larger than 30\u00a0dBm for control biases above \u221212\u00a0V.<\/jats:p>","DOI":"10.1049\/cds2.12159","type":"journal-article","created":{"date-parts":[[2023,7,27]],"date-time":"2023-07-27T02:51:30Z","timestamp":1690426290000},"page":"213-224","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Linear broadband interference suppression circuit based on GaN monolithic microwave integrated circuits"],"prefix":"10.1049","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3150-7053","authenticated-orcid":false,"given":"Megan C.","family":"Robinson","sequence":"first","affiliation":[{"name":"Department of Electrical, Computer, and Energy Engineering University of Colorado Boulder  Boulder Colorado USA"}]},{"given":"Zoya","family":"Popovi\u0107","sequence":"additional","affiliation":[{"name":"Department of Electrical, Computer, and Energy Engineering University of Colorado Boulder  Boulder Colorado USA"}]},{"given":"Gregor","family":"Lasser","sequence":"additional","affiliation":[{"name":"Chalmers University of Technology  Gothenburg Sweden"}]}],"member":"265","published-online":{"date-parts":[[2023,7,26]]},"reference":[{"volume-title":"In\u2010Band Full\u2010Duplex Wireless Systems Handbook","year":"2021","author":"Kolodziej K.E.","key":"e_1_2_10_2_1"},{"key":"e_1_2_10_3_1","doi-asserted-by":"publisher","DOI":"10.1109\/IEEECONF51394.2020.9457545"},{"key":"e_1_2_10_4_1","first-page":"681","volume-title":"1989 19th European Microwave Conference","author":"Kunes M.A.","year":"1989"},{"key":"e_1_2_10_5_1","first-page":"1","volume-title":"2016 IEEE MTT\u2010S International Microwave Symposium (IMS)","author":"Psychogiou D.","year":"2016"},{"key":"e_1_2_10_6_1","doi-asserted-by":"publisher","DOI":"10.1109\/TMTT.2017.2679182"},{"key":"e_1_2_10_7_1","doi-asserted-by":"publisher","DOI":"10.1109\/TCSI.2011.2162460"},{"key":"e_1_2_10_8_1","doi-asserted-by":"publisher","DOI":"10.1109\/ISSCC.2005.1494003"},{"key":"e_1_2_10_9_1","doi-asserted-by":"publisher","DOI":"10.1109\/JSSC.2009.2039268"},{"key":"e_1_2_10_10_1","doi-asserted-by":"publisher","DOI":"10.1109\/68.823515"},{"key":"e_1_2_10_11_1","doi-asserted-by":"publisher","DOI":"10.1109\/JSSC.2021.3063658"},{"key":"e_1_2_10_12_1","doi-asserted-by":"publisher","DOI":"10.1109\/JSSC.2012.2225542"},{"key":"e_1_2_10_13_1","doi-asserted-by":"publisher","DOI":"10.1109\/ISSCC.2009.4977388"},{"key":"e_1_2_10_14_1","doi-asserted-by":"publisher","DOI":"10.1109\/MWSYM.2012.6259548"},{"key":"e_1_2_10_15_1","doi-asserted-by":"publisher","DOI":"10.1109\/JSSC.2010.2077151"},{"key":"e_1_2_10_16_1","doi-asserted-by":"publisher","DOI":"10.1109\/TMTT.2016.2532867"},{"key":"e_1_2_10_17_1","doi-asserted-by":"publisher","DOI":"10.1109\/RFIC.2017.7969072"},{"key":"e_1_2_10_18_1","doi-asserted-by":"publisher","DOI":"10.1109\/JSSC.2007.908745"},{"key":"e_1_2_10_19_1","doi-asserted-by":"publisher","DOI":"10.1109\/JSSC.2010.2041405"},{"key":"e_1_2_10_20_1","doi-asserted-by":"publisher","DOI":"10.1109\/TCSII.2007.902218"},{"key":"e_1_2_10_21_1","doi-asserted-by":"publisher","DOI":"10.1145\/2534169.2486033"},{"key":"e_1_2_10_22_1","doi-asserted-by":"publisher","DOI":"10.1109\/TMTT.2019.2933212"},{"key":"e_1_2_10_23_1","doi-asserted-by":"publisher","DOI":"10.1109\/WAMICON.2018.8363502"},{"key":"e_1_2_10_24_1","doi-asserted-by":"publisher","DOI":"10.1109\/MWSYM.2017.8059092"},{"key":"e_1_2_10_25_1","doi-asserted-by":"publisher","DOI":"10.1109\/MWSYM.2018.8439290"},{"key":"e_1_2_10_26_1","doi-asserted-by":"publisher","DOI":"10.1109\/MWSYM.2017.8058678"},{"key":"e_1_2_10_27_1","first-page":"2257","volume-title":"Proceedings. 7th International Conference on Solid\u2010State and Integrated Circuits Technology, 2004","author":"Chu C.S.","year":"2004"},{"key":"e_1_2_10_28_1","doi-asserted-by":"publisher","DOI":"10.1109\/tmtt.2018.2890472"},{"key":"e_1_2_10_29_1","doi-asserted-by":"publisher","DOI":"10.1109\/EDSSC.2019.8754408"},{"key":"e_1_2_10_30_1","doi-asserted-by":"publisher","DOI":"10.1109\/MWSYM.2019.8700797"},{"key":"e_1_2_10_31_1","doi-asserted-by":"publisher","DOI":"10.1049\/ip-cds:19982121"},{"key":"e_1_2_10_32_1","doi-asserted-by":"publisher","DOI":"10.1109\/TMTT.2011.2178428"},{"key":"e_1_2_10_33_1","doi-asserted-by":"publisher","DOI":"10.1109\/TMTT.2012.2198231"},{"key":"e_1_2_10_34_1","doi-asserted-by":"publisher","DOI":"10.1049\/iet-map:20060014"},{"key":"e_1_2_10_35_1","doi-asserted-by":"publisher","DOI":"10.1109\/MWSYM.2009.5165780"},{"key":"e_1_2_10_36_1","doi-asserted-by":"publisher","DOI":"10.1049\/iet-map.2009.0547"},{"key":"e_1_2_10_37_1","doi-asserted-by":"publisher","DOI":"10.1587\/elex.16.20190599"},{"key":"e_1_2_10_38_1","doi-asserted-by":"publisher","DOI":"10.23919\/EuMIC54520.2022.9923535"}],"container-title":["IET Circuits, Devices &amp; 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