Array of dual band RMSAs with bend stub along the radiating edge

Various communication systems require single radiating element operating in dual frequency bands. This can be realized by reactively loading the patch with stubs, slots, or shorting pins. Stub loaded rectangular microstrip antenna (RMSA) with stub length comparable to /spl lambda//4, yields dual frequency operation with broadside radiation pattern at both the frequencies. But, the over all length of the configuration is increased as the stub is protruding out from the periphery of the patch. A compact realization of this configuration can be obtained by using /spl lambda//4 stub bend along the radiating edge of the patch MSAs configured in arrays offer enhanced gain performance at the expense of increased area of the configuration. Hence, a compact array using bend stub loaded RMSAs which occupies less space has also been investigated. The simulated results of these configurations using commercially available MOM based IE3D software followed by experimental verification are presented.