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Cheng, <i>et al<\/i>.: \u201cA broadband Doherty power amplifier design by optimizing its load modulation network,\u201d IEICE Electron. Express <b>16<\/b> (2019) 20181082 (DOI: 10.1587\/elex.16.20181082).","DOI":"10.1587\/elex.16.20181082"},{"key":"2","doi-asserted-by":"crossref","unstructured":"[2] W. Shi, <i>et al<\/i>.: \u201cBroadband continuous-mode Doherty power amplifiers with noninfinity peaking impedance,\u201d IEEE Trans. Microw. Theory Techn. <b>66<\/b> (2018) 1034 (DOI: 10.1109\/TMTT.2017.2749224).","DOI":"10.1109\/TMTT.2017.2749224"},{"key":"3","doi-asserted-by":"crossref","unstructured":"[3] R.J. Liu, <i>et al<\/i>.: \u201cA 24-28-GHz GaN MMIC synchronous Doherty power amplifier with enhanced load modulation for 5G mm-wave applications,\u201d IEEE Trans. Microw. Theory Techn. <b>70<\/b> (2022) 3910 (DOI: 10.1109\/TMTT.2022.3176818).","DOI":"10.1109\/TMTT.2022.3176818"},{"key":"4","doi-asserted-by":"crossref","unstructured":"[4] H. 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