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Microstrip antennas have many advantages over the conventional antennas because of light weight and low volume, low profile planar configuration which can be easily made conformal to host surface, low fabrication cost, capable of dual and triple frequency operations, mechanically robust when mounted on rigid surfaces rectangular microstrip antenna exhibits several limitations such as low bandwidth, low efficiency, low gain and directivity owing to the excitation of surface waves. There are numerous and well-known methods to increase the bandwidth of antennas, including increase of the substrate thickness, the use of a low dielectric substrate, slotted patch antenna, the use of various impedance matching and feeding techniques.
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