  A Microstrip patch array antenna has been designed for 5.62 GHz on FR4
substrate having a dielectric constant of 4.4 and thickness is 1.6 mm.The
antenna is used to design for use with a low cost imaging radar MicroSAR. The
antenna composed of an array having 16 patch elements could achieve the
simulated gain of 17.5 dB with a bandwidth of 5 percent.The antenna consists of
multilayer structure where two double side copper cladded substrates FR4 are
used.The substrates are put in contact with each other and the common copper
layer forms ground plane.The patch elements are placed on the top of one of the
substrate and feed network is placed back side of the substrate.To increase the
bandwidth of the antenna the height of the substrate is increased.The Foam
material is placed between the two substrate to increase the height of the
antenna.The corporate feed network is used to smoothly transfer the power from
main port to the feed of antenna.
