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In rapidly developing market in personal communication systems (PCS), mobile satellite communications, direct broadband television (DBS) wireless local area networks (WLANs) suggest that demand for Microstrip antennas and array will increase even further. In this paper the gain of microstrip patch antenna is enhanced by using covered dielectric layer which is separated from feed patch by air as an another dielectric. Here two patches, one feed patch and one parasitic patch are used to enhance the gain and bandwidth and whole structure resonates at their resultant frequency which is in the ISM band. Air is used as dielectric between feed patch and ground plane as well as between feed patch and parasitic patch. The dimensions of feed patch are adjusted to achieve desired resonant frequency. In this microstrip antenna the coaxial probe feed technique is used for its simplicity. This antenna structure is simulated using zeland IE3D software package and effects of physical parameters are investigated. This work leads to conclusion that directivity, bandwidth and gain of microstrip antenna can be increased by covered dielectric and multidielectric structure with parasitic patch. The gain is found as 13.4 dbi and bandwidth as 220 MHz which is higher as compare to conventional rectangular patch antenna.

Enhancement of Gain of Rectangular Micro Strip Antenna Using Multilayer Multidielectric Structure