Analysis and Optimization of the Beam Control Algorithm for Wide-band Phased Array Antenna
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Abstract:
The beam pointing squint phenomenon can be improved or avoided by connecting a true time delay line to each antenna element or sub-array when the phased array antenna operates at wideband mode and transmit/ receive signal with an instantaneous wideband bandwidth. Based on the method of delay remainder, two novel methods have been proposed in this paper to calculate and optimize the codes of true time delay lines and phase-shifters. One is method of trace center frequency which is capable of achieving less beam pointing deviation and lower side-lobe levels when the instantaneous frequency band varies and the other is adaptive minimum step method which can further reduce the beam pointing deviation across the operating frequency band . The proposed methods can be widely utilized in wideband phased array for improving the performance of radiating patterns across a wide-band frequency range. The closed forms corresponding to each method have been derived and several examples have been illustrated to verify the effectiveness of the proposed methods.
