Low-Profile Four-Port Patch Antenna with Wide Isolation-Bandwidth and Same Polarization: Principle and Design Approach

In this letter, a low-profile four-port microstrip patch antenna (MPA) with wide isolation bandwidth and same polarization is proposed by using characteristic mode analysis. Firstly, the internal electric-field and modal significance (MS) of the shorted two-port MPA are theoretically studied. It sho...

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