Design of a Low-Profile Wideband Magnetoelectric Dipole Antenna with Reduced Gain Drop

Abstract

In this paper, a novel low-profile magnetoelectric (ME) dipole antenna with wideband is presented. The conventional vertical fixing structure is bended four times from the center to the sides. The Γ-shaped feeding structure is bended two times to lower the height of the antenna step by step. The effect of three kinds of vertical wall is discussed to show their influence on boresight gain. Through comparison, only one vertical wall is erected on the left side of the ground to decrease the boresight gain drop at 2.2 GHz. Both simulation and analysis are made to sufficiently explain the working principle. At last, the proposed ME dipole antenna has only 0.095λ0 (λ0 is the center operating wavelength in free space) in height, and the wideband property is still maintained. By simulation, the relative bandwidth for VSWR < 2.0 is 47.9% (from 1.35 to 2.2 GHz). The boresight gain ranges from 8.1 to 9.6 dBi in the operating band. The measured relative bandwidth for VSWR < 2.0 is 50.3% (from 1.34 to 2.24 GHz), and the boresight gain ranges from 7.38 to 8.73 dBi. The gain drop on boresight is less than 1.4 dBi. Radiation patterns show a unidirectional characteristic in the whole operating band. Additionally, the cross-polarization level is less than −25 dB on boresight. The simulating and measuring results agree well with each other. Therefore, the proposed antenna is suitable for applications of limited height and wideband.

Numerical Extraction of the Equivalent Circuit for a Basic Magnetoelectric Dipole Antenna

“…The magnetoelectric (ME) dipole is a unidirectional antenna primarily proposed by Chlavin [13] and developed by Luk and Wong [14]. In recent years, several novel designs for this antenna, characterized by dual polarization [15], low profile [16], wide beam [17], reconfigurable [18], and ultra-wideband [19], have been reported. Notably, the implementation of a co-simulation between the basic ME dipole and its front-feeding circuit necessitates an equivalent circuit model of the antenna.…”