مشخصات پژوهش

A very closely-spaced 2 3 1 microstrip-patch array antenna is proposed for present and future modern compact array systems. Between the antennas, a novel isolation structure developed from two parasitic L-shaped strips with only one via for each one is presented to reduce the mutual coupling more than 53 dB at the resonant frequency in 10 GHz in comparison with the conventional array without any isolators. Unlike the other methods, this isolator has a simple and cost-effective structure with a good performance, low destructive effects on the radiation and resonance position, low design and fabrication complexity, and simple optimization method which can notably block the surface and space waves between the antennas. Simplified semi-analytical expressions and a guided-wave-length-based parametric study are conducted on key geometrical parameters of the isolator circuit model to determine their effects on the overall behavior. To validate the technique and present its advantages, the final design has been fabricated, measured, and compared with the selected recently proposed suitable works. A good agreement was also achieved in comparison with the simulated results.