Thu, 07 Aug 2008 21:55:19 BST CiteULike: dcastro's library [2029 articles] http://www.citeulike.org/user/dcastro/article/2774610 CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dcastro/article/2774610 <i>Microwave Symposium Digest, 1999 IEEE MTT-S International, Vol. 2 (1999), pp. 663-666 vol.2.</i><br /><br />This work discusses the use of a microstrip-fed slot antenna to directly provide the necessary output match and harmonic tuning for a 10 GHz class-E power amplifier. There is no matching circuit at the output of the amplifier since the slot is designed to provide the correct impedance at the fundamental frequency and to present an open circuit at the second harmonic. This eliminates losses in the matching circuit and decreases circuit area. Since the class-E amplifier requires a complex output load, the designed slot antenna is not a resonant structure. The device used is an Alpha AFM04P2 MESFET, which has a maximum output power of about 21 dBm. The measured performance of the active antenna shows 74% drain efficiency, 62% power-added-efficiency (PAE), and 20 dBm output power at 10 GHz, at 5 dB gain compression. The PAE is greater than 50% in a 400 MHz bandwidth A 10 GHz high-efficiency active antenna MD Weiss Z Popovic doi:10.1109/MWSYM.1999.779848 Microwave Symposium Digest, 1999 IEEE MTT-S International, Vol. 2 (1999), pp. 663-666 vol.2. 2008-05-09T07:26:08-00:00 1999 Microwave Symposium Digest, 1999 IEEE MTT-S International 2 663 666 vol.2 active antenna efficiency high