Design of a Uwb Combined Antenna and an Array of Miniaturized Elements With and Without Lens

Abstract

In this paper, the design of an array of wideband combined antenna elements is presented. A TEM horn antenna is combined with magnetic dipoles to obtain a wideband element with a bandwidth from 180 MHz to 30 GHz. The element is then miniaturized in order to be placed in a two by two array, and then the optimized values of the horizontal and vertical spacings are calculated. To enhance the array bandwidth, a lens is placed in front of each element. This leads to an increase in the bandwidth from 0.2 to 10 GHz while no grating lobes appear over the bandwidth. The combined element is fabricated and the simulation results are verified by the measured data. Furthermore, simulation results for the return loss, radiation patterns and antenna gain for the 2 × 2 array are presented.

The role played by evanescent fields in the process of formation of radiation of combined radiating systems

“…Such antennas contain at least two radiating centers separated by a distance of about 0.3-0.5 of the wavelength. The proposed new constructive solutions of such antennas [6] are still based on very general physical ideas presented in [5].…”