High-Performance Multi-Band Dual-Port MIMO Antenna for Ku and K-Band Communication Systems

Abstract

This paper presents a compact dual-port MIMO antenna, designed and optimized using full-wave HFSS simulations, for Ku- and K-band radar and satellite communication applications. The antenna employs a rectangular patch with integrated ring-slot stubs, enhancing bandwidth, gain, and port isolation. With overall dimensions of 24×24×1.6 mm³ on an FR-4 substrate, the simulated results demonstrate three wide impedance bands: 13.56–14.86 GHz, 16.60–18.76 GHz, and 20.50–28.36 GHz, effectively covering the Ku and K bands. The antenna achieves a peak simulated gain of 9.06 dBi, radiation efficiency above 85%, and inter-port isolation greater than 18 dB. Excellent diversity performance is observed, with an envelope correlation coefficient (ECC) below 0.012, diversity gain around 9.9 dB, and TARC under –10 dB. These simulation results confirm that the proposed design is a compact, high-performance, and reliable MIMO solution for next-generation radar, satellite, and vehicular communication systems operating in Ku and K bands.