A new broadband trapezoidal flat monopole antenna

The necessity to use a great bandwidth in communication industries led to a change of the shape of the monopole antennas and use of a flat rather than a bar as radiator. This type of antenna was proposed for the first time in 1958 by Mr. B.J. Lamberty in the form of a rectangular plate. from then on, other similar antennas were presented in the shape of circular, elliptical, and trapezoidal discs which meant to increase the bandwidth. That, in turn, led to better radiation pattern which ended in the improvement of the design. Having this in mind, we leave tried in this article to present a new shape of broadband monopole antennas with proper bandwidth and radiation pattern as following.