Resonant Slots as Defected Ground Structure for Suppression of Cross-Polarized Radiations in a Microstrip Patch Antenna

In this communication the rectangular microstrip antenna with resonant slots etched ground plane is proposed for the suppression of cross-polarized (XP) radiations. There is need of high isolation between co-pol to cross-polarized radiations for high quality sensors used in satellite or any wireless sensor network. The conventional MPA with any type of feed normally gives the isolation between co-pol to cross-polarized radiations of about 26dB. Here in this work it shown that it can be enhanced more than 52dB. The technique is simple, innovative, easy to implement for practical applications. The XP suppression of about -30dBi below ±70° and 16dBi above ±70° is achieved with good co-to cross-pol isolation of -60dBi below ±70° and 36dBi above ±70° is obtained. This configuration shows a co-pol peak gain of 6 dB and is good for wireless sensor applications. A prototype has been fabricated using commercially available low-loss dielectric material FR4 (glass epoxy) with dielectric constant (ε
_r
) = 4.4. The experimental validation of the simulated predictions is under progress.