Title :
High efficiency mode "E" amplifier powers high efficiency active transmitting patch antenna
Author :
Ortega Gonzalez, F.J. ; Asensio Lopez, A. ; Gonzalez Posadas, V. ; Jimenez Martin, J.L. ; Martin Pascual, C.
Author_Institution :
Univ. Politecnica de Madrid, Spain
Abstract :
This paper describes a high efficiency amplifier that uses the load presented by a patch antenna to work in class "E". The resulting set is a high efficiency transmitting active antenna. The dimensions, shape and location of the feeding point in the antenna are selected to obtain an input impedance to force the transistor to work in class "E" at 885 MHz with very high collector efficiency: /spl eta/c=90%@Vcc=12.5, Pout=1.5 W.
Keywords :
UHF power amplifiers; active antennas; antenna feeds; microstrip antennas; transmitting antennas; 1.5 W; 12.5 V; 885 MHz; active transmitting patch antenna; class E power amplifier; collector efficiency; feeding point; input impedance; Equations; Frequency; High power amplifiers; Impedance; Packaging; Parasitic capacitance; Patch antennas; Power generation; Shape; Transmitting antennas;
Conference_Titel :
Microwave Symposium Digest, 1998 IEEE MTT-S International
Conference_Location :
Baltimore, MD, USA
Print_ISBN :
0-7803-4471-5
DOI :
10.1109/MWSYM.1998.705031
