TY - JOUR
T1 - A Compact QPSK Modulator with Low Amplitude and Phase Imbalance for Remote Sensing Applications
AU - Ghaffar, Farhan Abdul
AU - Al-Naffouri, Tareq Y.
AU - Mobeen, M. Kashan
AU - Salama, Khaled N.
AU - Shamim, Atif
N1 - KAUST Repository Item: Exported on 2020-10-01
PY - 2012/9/30
Y1 - 2012/9/30
N2 - A new, compact and wide-band Quadrature Phase Shift Keying (QPSK) modulator is presented for remote sensing applications. The microstrip-based modulator employs quadrature hybrid coupler, Wilkinson divider, rat race coupler and GaAs MESFET switches. It is designed to be part of an X band remote sensing transmitter with a center frequency of 8.25GHz. The fabricated module demonstrates the lowest reported amplitude and phase imbalances (0.1dB and 0.4° respectively) around its center frequency. The modulation, tested up to 160 Mbps data rate, displays carrier suppression greater than 30 dB. With negligible DC power consumption and low insertion loss, it operates for a wide bandwidth of 3 GHz (7-10 GHz). The effect of amplitude and phase imbalance is investigated on the performance of the modulator. Finally, a transmitter employing this modulator exhibits an excellent overall Error Vector Magnitude (EVM) of around 8 % that is considerably low as compared to the typically obtained values for such transmitters.
AB - A new, compact and wide-band Quadrature Phase Shift Keying (QPSK) modulator is presented for remote sensing applications. The microstrip-based modulator employs quadrature hybrid coupler, Wilkinson divider, rat race coupler and GaAs MESFET switches. It is designed to be part of an X band remote sensing transmitter with a center frequency of 8.25GHz. The fabricated module demonstrates the lowest reported amplitude and phase imbalances (0.1dB and 0.4° respectively) around its center frequency. The modulation, tested up to 160 Mbps data rate, displays carrier suppression greater than 30 dB. With negligible DC power consumption and low insertion loss, it operates for a wide bandwidth of 3 GHz (7-10 GHz). The effect of amplitude and phase imbalance is investigated on the performance of the modulator. Finally, a transmitter employing this modulator exhibits an excellent overall Error Vector Magnitude (EVM) of around 8 % that is considerably low as compared to the typically obtained values for such transmitters.
UR - http://hdl.handle.net/10754/246373
UR - http://www.ampublisher.com/April%202011/EEE-1104-017ACompactQPSKModulatorwithLowAmplitudeandPhaseImbalanceforRemoteSensingApplications.pdf
M3 - Article
SN - 0840-8688
JO - Canadian Journal on Electrical and Electronics Engineering
JF - Canadian Journal on Electrical and Electronics Engineering
ER -