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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.
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