Dual-Mode Microstrip Patch Antennas For Largely Spaced Phased Arrays

Optimization ofvirtually aperiodiclinear sparse arrays

“…A primitive study toward optimizing the excitation coefficients was also conducted. 18 However, (i) the analysis was based on simplified analytical expressions for radiation, (ii) there was no control on the amplitude ratio between the fundamental and higher order mode, which can cause a significant reduction in the array gain, (iii) only normalized radiation patterns were considered that do not reflect the absolute gain values, (iv) there were no constraints on the beamwidth and input power and (v) there was no consideration of pattern reconfigurability. Thus, it can be inferred that the existing approaches do not carefully use the full synthesis flexibility in terms of individual amplitude-phase control at each port in the array, do not guarantee the optimality of the solution, do not consider mutual coupling effects in the synthesis, and cannot adapt to the changes in the beam forming requirements fast enough.…”