Effect of parasitic elements on spherical probe-fed antennas

Abstract

Theory and experiment of a spherical probe-fed conformal antenna with a parasitic element mounted on a spherical multilayer structure are presented in this paper. Linear Rao-Wilton-Glisson (RWG) triangular basis functions are applied in MPIE formulation. Current distributions on coaxial probe and conformal radiating elements are computed by using spatial domain Dyadic Green's Function (DGF) and its asymptotic approximation. A prototype of such an antenna is fabricated and tested. The effect of the parasitic element on the input impedance and radiation patterns of the antenna is investigated. It is shown that the antenna characteristics are improved significantly with the presence of the conducting parasitic element. Good agreement is achieved between the results obtained from the proposed methods and the measurement results.

Compact ultra‐wideband diversity antenna with a floating parasitic digitated decoupling structure

“…The resulting floating parasitic structure improves wideband characteristic of the proposed antenna array. The parasitic elements affect various antenna parameters as demonstrated for narrow band applications [13][14][15]. To elaborate the working of the decoupling structure, a full numerical parametric analysis was carried out.…”

“…Parasitic elements are well known for enhancing gain in antennas [13][14][15]; however they have not been applied to enhance isolation between UWB diversity antenna elements. In this paper, a diversity antenna is proposed that employs a floating digitated parasitic element that provides a wideband isolation characteristics.…”