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A small microstrip patch/slot antenna, which achieves a very large bandwidth on a relatively thin substrate (about 0.01lambda0), is presented. The performance is achieved by employing a combination of annular-ring loading on the patch radiator and the use of a crossed-slot for miniaturisation. An additional ring-slot in the ground plane is used to produce the wideband characteristics of the antenna. Simulated and measured results indicate that a 53% fractional impedance bandwidth is achieved with respect to the centre frequency of 1.409 GHz and the size of the antenna is reduced by 50% compared to the conventional circular patch antenna with respect to a given frequency
Bao, X. & Amman, M. (2007) Small Patch/Slot Antenna with 53% Input Impedance Bandwidth. >i>Electronics Letters, Feb. 1 2007, vol. 43. no. 3, pp.146-148. doi:10.1049/el:20073279 .