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Design and development of a novel arrow headed modified cross slot array antenna with dual band characteristics and circular polarisation is reported. The proposed array configuration consists of an array of four arrow headed modified cross slot elements which are electromagnetically coupled by using a 1 : 4 corporate feed network. The slot elements are etched on the ground plane of the dielectric substrate with a feeding network on the other side. The proposed slot array shows dual band behaviour and enhanced gain characteristics compared to a single element arrow headed modified cross slot antenna. The slot array antenna shows resonance at two frequencies of 1.72GHz (1.6912GHz– 1.7656GHz) and 2.45 (2.3656GHz–2.5568GHz)GHz with circular polarisation in the upper band. This novel slot array configuration has a measured gain of 6.23 dBi at the lower resonant frequency and 7.01 dBi at the upper resonant frequency. The proposed slot array antenna exhibits bidirectional radiation patterns with improved gains. The simulated results are in good agreement with the experimental ones.

AN ARROW HEADED MODIFIED CROSS SLOT ARRAY ANTENNA WITH DUAL BAND CHARACTERISTICS AND CIRCULAR POLARISATION