Title :
Solid state power amplifier using impedance-transforming branch-line couplers for L-band satellite systems
Author :
Robertson, I.D. ; Herath, R. ; Gillick, M. ; Bharj, J.
Author_Institution :
Communications Research Group, Dept. of Electronic and Electrical Engineering, King´´s College London, Strand, London, UK, WC2R 2LS. Tel. +44 (0)71873 2523 Fax +44(0)718364781
Abstract :
The application of impedance-transforming branch-line couplers to the design of an L-band high power MESFET amplifier is presented for the first time. By using the impedance-transforming coupler to power combine the MESFETs, the matching networks are simplified considerably leading to lower losses and hence improved performance. The amplifier presented here operates at a centre frequency of 1.7 GHz and has a measured small-signal gain of 8.5 dB with a CW output power of over 18 W.
Keywords :
Couplers; Frequency; High power amplifiers; Impedance; L-band; MESFETs; Performance loss; Power amplifiers; Satellites; Solid state circuits;
Conference_Titel :
Microwave Conference, 1993. 23rd European
Conference_Location :
Madrid, Spain
DOI :
10.1109/EUMA.1993.336592
