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A microstrip slot antenna is very small and lightweight still it has the problem of back radiation due to which power loss occurs and the SAR increases. To reduce the back lobe a technique introduces, i.e., aperture coupled microstrip slot antenna which reduces the back lobe as well as increases the bandwidth of the antenna. Aperture coupled microstrip slot antenna couples the patch antenna with micro-stripline through an aperture. At microwave and millimeter wave frequencies microstrip slot antenna becomes very small & lightweight. In spite of these advantages, it has main disadvantage of back radiation; which limits its use in mobile communication. To minimize the back radiation a reflector plate behind the slot or a cavity (2-3) may be used.
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