A novel printed ultrawideband (UWB) CPW-fed Koch fractal slot antenna is proposed. The UWB bandwidth is largely enhanced\r\nby the three-iteration Koch fractal slot whose extrusive angle is 900 instead of 600 to obtain better convoluted shape and selfsimilarity.\r\nThe -10 dB impedance bandwidth is 3400MHz (1270ââ?¬â??4670 MHz) or about 114% in comparison with 1290MHz\r\n(1620ââ?¬â??2910 MHz) or about 57% of the referenced square slot antenna. Details of the proposed antenna design and performance\r\nare presented and discussed.
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