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A novel single element KSA (Kingdom of Saudi Arabia) sign shape, and two element array (Ultra Wide Band) KSA sign shape slot microstrip antennas are presented. A novel KSA sign shape EBG cells are applied to reduce the mutual coupling between array elements with the same shape. The results show that a reduction in mutual coupling of 8 dB is achieved at first band (2.1 - 2.99) GHz and 33 dB at second band (5 - 9.43) GHz. The microstrip array was studied by CST simulator and fabricated by proto laser machine with precision 25µm. The antenna can be used in the military or RFID applications. Index Terms—Microstrip patch antenna, mutual coupling, EBG, KSA sign shape. compactness in EBG structures, different shapes with significant gaps are designed (5). The practical applications of EBG structures have difficulties in accommodating their physical sizes. In this paper, the proposed EBG structure is a KSA sign shape which has more gaps and compactness. The technique used in this paper to reduce mutual coupling loss, by increasing the number of EBG cells and by varying the gap distance between cells. The reduction in mutual coupling by means of periodic structure becomes particularly efficient when grating lobes must be avoided (6). Array antennas are mostly large in size also to improve the performance of the arrays EBG cells are to be placed in between the patch antenna which makes the size much larger. So as to reduce the size of the antenna the proposed method is designing small cells of KSA sign shape for placing EBG cells closer to the patch antenna placed together in the same layer. Another, major drawback of patch antennas array is narrow bandwidth. A possible way to increase the bandwidth is to either increase the height of the dielectric or decrease the dielectric constant. In this paper the first two drawbacks and its approaches are analyzed and the simulated and measured results are also obtained. This configuration is chosen because the KSA sign shape is the official page for any military application. So, this antenna may be used in soldier belts, any commodity for the military application, etc. It should be noted that its main application depends on the range of frequency. According to the chosen ranges of the operating frequency it can be used in RFID (7) or in communication systems.

UWB KSA Sign Shape Slot Microstrip Antenna Array Mutual Coupling Reduction for Official Applications