Title :
Direct QPSK modulator for point-to-point radio link at 23 GHz
Author :
Jokanovic, Branka ; Stojanovic, Snezana ; Peric, Miroslav
Author_Institution :
Inst. of Microwave Techniques & Electron., Novi Beograd, Serbia
fDate :
6/23/1905 12:00:00 AM
Abstract :
The design and characteristics of a simple direct QPSK modulator for a terrestrial point-to-point radio link is presented. This modulator enables a compact, low cost and high efficiency transmitter. Good sideband suppression, greater then 25 dB is obtained in the frequency range 21.0 to 24.0 GHz, without tuning. The insertion loss is less than 8 dB in 3 GHz bandwidth and the carrier suppression is about 22 dB
Keywords :
digital radio; interference suppression; microwave links; modulators; quadrature phase shift keying; radio transmitters; 21 to 24 GHz; Schottky barrier diodes; Wilkinson divider; branch-line coupler; direct QPSK modulator; point-to-point radio link; sideband suppression; terrestrial radio link; transmitter; Amplitude modulation; Circuits; Costs; Filters; Microstrip; Phase modulation; Quadrature phase shift keying; Radio frequency; Radio link; Radio transmitters;
Conference_Titel :
Telecommunications in Modern Satellite, Cable and Broadcasting Service, 2001. TELSIKS 2001. 5th International Conference on
Conference_Location :
Nis
Print_ISBN :
0-7803-7228-X
DOI :
10.1109/TELSKS.2001.954879
