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This paper describes a printed rectangular-plate monopole fed by microstrip line. The effect of varying the plate width, feed-gap height, and feedline width on the impedance bandwidth is examined. It is shown that for a fixed ground-plane size, that optimization of these parameters can yield an impedance bandwidth ratio of 4.3:1, without using any broadbanding techniques.
John, M., and Ammann, M.: "Optimization of Impedance Bandwidth for the Printed Rectangular Monopole Antenna", Microwave and Optical Technology Letters, vol. 47, issue 2, pp. 153-154, 10/2005.