Title :
Pulse shape optimization in time-modulated arrays for sideband radiation suppression
Author :
Poli, Lorenzo ; Bekele, Ephrem T. ; D´Urso, Michele ; Rocca, Paolo ; Massa, A.
Author_Institution :
ELEDIA Res. Center @ DISI, Univ. of Trento, Trento, Italy
Abstract :
In time-modulated arrays, the signal transmitted or received by the array elements is multiplied by means of a train of periodic pulses which allow to obtain an angularly selective radiation pattern at the antenna working frequency. Generally, a set of radio-frequency switches is used for the pulse generation and it is assumed that ideal rectangular waveforms are obtained. In this work, pulse waveforms having non-instantaneous on-off transitions are taken into account and their shapes are optimized by means of a stochastic global algorithm in order to reduce the losses in the sidebands caused by the time modulation process.
Keywords :
antenna phased arrays; antenna radiation patterns; interference suppression; modulation; particle swarm optimisation; stochastic programming; switches; angularly selective radiation pattern; antenna working frequency; array elements; loss reduction; noninstantaneous on-off transitions; particle swarm optimization; periodic pulses; phased arrays; pulse generation; pulse shape optimization; pulse waveforms; radio-frequency switches; rectangular waveforms; sideband radiation suppression; stochastic global algorithm; time modulation process; time-modulated arrays; Amplitude modulation; Antenna arrays; Harmonic analysis; Optimization; Shape; Particle Swarm Optimization; antenna arrays; pulse shaping; sideband radiation; time-modulated linear arrays;
Conference_Titel :
Antennas and Propagation (EuCAP), 2014 8th European Conference on
Conference_Location :
The Hague
DOI :
10.1109/EuCAP.2014.6901767