Abstract
An array antenna of two high-coupled patches with an edge-to-edge distance of only at 3.45 GHz merged with a Jerusalem-like parasitic structure (JPS) is reported. This JPS is compactly sandwiched between two patches and consists of two strips, horizontal (HS) and vertical (VS). HS perturbs the current distributions and so presents two mechanisms for improving the impedance matching and exciting the new half-mode of quasi TM1/2,1 in comparison with TM01. Additionally, a broadside pattern is provided with a 10 dB increment in polarization purity and a gain over 5.5 dB. VS with two symmetric vias decreases the mutual coupling extremely and isolation over 49 dB is obtained. Moreover, the theory of the excitation modes, the performance and the parametric studies are presented. Two array antennas are fabricated with and without JPS and their results are compared which prove a 15% increase in total MIMO efficiency and a significant reduction in ECC.
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