Title :
2.75-4.75 GHz QPSK modulator with low amplitude and phase errors
Author :
Kumar, S. ; Wells, G.
Author_Institution :
Dept. of Electr. Eng., Saskatchewan Univ., Saskatoon, Sask., Canada
fDate :
7/5/1990 12:00:00 AM
Abstract :
A QPSK modulator with a 2.75-4.75 GHz operating frequency range is presented. The modulator is realised using a broadband power divider, microstrip-slotline-microstrip transitions and Lange couplers. Computer optimised matching circuits are used to maintain a phase error less than 5 degrees and an amplitude phase imbalance error across the band of less than 0.5 dB. The modulator is suitable for MMIC implementation.
Keywords :
MMIC; modulators; phase shift keying; solid-state microwave circuits; waveguide components; 2 GHz; 2.75 to 4.75 GHz; Lange couplers; MMIC implementation; QPSK modulator; SHF; UHF; amplitude phase imbalance error; broadband power divider; microstrip-slotline-microstrip transitions; operating frequency range; optimised matching circuits; phase error; quadrature phase shift keying;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19900625
