Polar Antenna Impedance Detection and Tuning for Efficiency Improvement in a 3G/4G CMOS Power Amplifier

Autor:	Shouhei Kousai, Kohei Onizuka, Junji Wadatsumi, Takashi Yamaguchi, Yasuhiko Kuriyama, Masami Nagaoka
Rok vydání:	2014
Předmět:	Engineering Loop antenna business.industry Antenna amplifier RF power amplifier Antenna measurement Electrical engineering Antenna factor Antenna tuner Antenna efficiency Hardware_GENERAL Electronic engineering Electrical and Electronic Engineering Antenna (radio) business
Zdroj:	ISSCC
ISSN:	1558-173X 0018-9200
Popis:	One of the ultimate goals in power amplifier design is to enhance the effective efficiency and achieve a long battery life. Therefore, both the peak efficiency and the efficiency loss due to antenna impedance mismatch or power back-off are highly critical design issues. In particular, the challenge of the antenna impedance mismatch is becoming more severe, due to the increased frequency band and smaller antenna size. Moreover, the antenna mismatch also changes with time due to the user proximity effect [1].
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b6a7fdd7e7e055c3d3fc485541e03ac8 https://doi.org/10.1109/jssc.2014.2361322 Zobrazit plný text záznamu