Abstract
ABSTRACT A small-size broadband circularly polarized (CP) two-element multiple-input–multiple-output (MIMO) slot antenna with a very low envelope correlation coefficient (ECC) is proposed for ultra-wideband (UWB) applications. Broadband circular polarization is attained by embedding the identical pair of spiral slots, rectangular slot, and grounded-L stub on the I-shaped slot antenna. Isolation is achieved through embedding two different slots between mirrored CP square slot antenna elements. The proposed MIMO antenna provides 58.82% (4.8–8.8 GHz) 3-dB axial ratio bandwidth (ARBW), 138.32% (3.17–17.39 GHz) impedance bandwidth (IBW), and more than 16 dB port isolation over the operating band. The MIMO slot antenna size is 40 × 20 mm2 with a measured peak gain of about 4.41 dBi and efficiency more than 70%. The diversity performance is computed and presented in detail.
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