Title :
12.5GHz–13GHz QPSK modulator direct at carrier with improved parameters for space applications
Author :
Hussain, Sajid ; Maalik, A. ; Sheikh, Noor M.
Author_Institution :
Electr. Eng. Dept., Univ. of Eng. & Technol., Lahore, Pakistan
Abstract :
In this paper, design of a QPSK Modulator Direct at Carrier in Ku Band for on board satellite applications is presented. Since, power issue is crucial in space therefore a passive topology is implemented with low insertion loss. Besides, other parameters like Error Vector Magnitude (EVM), phase and magnitude imbalances, signal to noise ratio (SNR) and carrier suppression are also improved to a greater extent. An ultra high carrier suppression of almost 40dB, SNR greater than 50 and EVM less than 3 % has been achieved at a data rate of 3.2Mbps.
Keywords :
microwave mixers; modulators; network topology; quadrature phase shift keying; satellite communication; Ku band; QPSK modulator; board satellite application; error vector magnitude; frequency 12.5 GHz to 13 GHz; low insertion loss; magnitude imbalance; microwave mixer; passive topology; phase imbalance; signal to noise ratio; space application; ultra high carrier suppression; Couplers; Microwave circuits; Microwave filters; Mixers; Phase shift keying; Satellites; 90° Branch Line coupler; Matched coupled line bandpass filter; Wideband Microwave mixer; Wilkinson power Divider;
Conference_Titel :
Computational Technologies in Electrical and Electronics Engineering (SIBIRCON), 2010 IEEE Region 8 International Conference on
Conference_Location :
Listvyanka
Print_ISBN :
978-1-4244-7625-1
DOI :
10.1109/SIBIRCON.2010.5555369
