This paper presents, for the first time, the hybrid use of loading techniques (which involve terminating the spiral arms with different\nstructures to give a resistive or capacitive effect) and a novel technique of cavity groove in order to enhance the performance of twoarm,\ncavity-backed, 2â??18 GHz spiral antenna. The antenna is made on Duroid 5880 and has the smallest form factor (50mm\ndiameter), meeting all the performance metrics, which are targeted for efficient performance of a spiral antenna for ultrawideband\n(UWB) applications. Measured results match the simulated results and show that by the utilization of hybrid loading\nand cavity groove, the gain is increased by a factor of 3.65 dBi and the axial ratio is improved by 2.73 dB at (2 GHz) as compared\nto a simple Archimedean antenna made on Duroid 5880, without increasing the size. The proposed antenna shows 2.25 dB\nmore gain and improved axial ratio performance as compared to a simple Archimedean spiral antenna made on Tmm4, without\nthe utilization of the hybrid techniques proposed earlier in the literature
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