Design of a compact protrudent-shaped ultra-wideband multiple-input-multiple-output/diversity antenna with band-rejection capability

In this endeavor, a new multiple-input-multiple-output antenna with a sharp rejection at wireless local area network (WLAN) band is designed and practically examined for portable wireless ultra-wideband applications. The intended diversity antenna possess a small size of 15 mm x 26 mm and two inverted L-strip are loaded over the conventional rectangular patch antenna to form protrudent-shaped radiator that acts as a radiating element. The sharp band-rejection capability at WLAN is established by incising the L-shaped slits at the decoupling structure. More than -21 dB isolation is accomplished for the complete working band (ie, 2.87 -17 GHz). Degradation in the antenna efficiency at the center frequency of band rejection corroborates the good interference rejection capability. The working capabilities of the intended antenna are tested by using the isolation between the ports, total efficiency, gain, envelope correlation coefficient, radiation pattern, mean effective gain, and total active reflection coefficient.