A circularly polarized low‐profile magnetoelectric dipole antenna

Abstract

In this article, we proposed a novel circularly polarized magnetoelectric (ME) dipole antenna with low profile, which is excited by substrate integrated waveguide aperture‐coupled feeding structure with a butterfly‐shaped slot. The ME dipole antenna is formed of a couple of oblong metallic patches with square corner cutting off and elliptic perturbation acting as electric dipole, and two couples of vertical metalized via holes working as magnetic dipole. The profile of the antenna is 0.122λ0. The antenna achieves a fractional bandwidth of 32.6% for |S11| smaller than −10 dB from 22.6 to 31.3 GHz and the 3‐dB axial‐ratio bandwidth (BW) of 12.8% from 22.6 to 25.7 GHz. Moreover, the gain is maintained over 6 dB for a large portion of the operational BW. The measured boresight gain is 7.8 dB.

A Wideband Circularly Polarized Magnetoelectric Dipole Antenna for 5G Millimeter-Wave Communications

“…It can be seen from the table that the proposed antenna demonstrated outstanding performance in terms of overall size, AR bandwidth, and peak gain. Many interesting designs of CP antennas based on ME dipole structure have been reported [ 8 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 ]. The proposed antenna is the smallest among its competitors with comparable gain and CP bandwidth.…”

“…The proposed antenna is the smallest among its competitors with comparable gain and CP bandwidth. The antennas presented in [ 8 , 16 ] have smaller gain narrow bandwidth. The antennas presented in [ 17 , 18 , 19 ] have superiority in terms of bandwidth at the expense of larger antenna size, although, their gain performance is comparable with our proposed antenna.…”

“…In the course of designing ME dipole antennas [ 12 , 13 ], less attention has been paid to CP ME dipole based antennas. In the past few years, some CP antennas based on ME dipole structures have been reported [ 8 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 ]. In [ 14 ], an ME dipole structure was reported to use a pair of bowtie patch antennas and a pair of trapezoidal-shaped dipoles fed by a Wilkinson power divider to achieve a 3 dB AR bandwidth of 33%.…”

“…The proposed antenna achieved 27.67% of 3 dB AR bandwidth. In [ 16 ], substrate integrated waveguide (SIW) and aperture coupled feeding was used to excite an ME dipole antenna for mm-wave applications. This antenna achieved a 3 dB AR bandwidth of 12.8%.…”

Low-Profile and Wideband Circularly Polarized Magneto-Electric Dipole Antenna Excited by a Cross Slot

“…Among these different types of antennas, CP antennas are preferred owing to their superior ability to reduce the detrimental influence of multi-path interference and mitigate the polarization mismatch between the transmitting and receiving antennas [15], [16]. Therefore, this has led to increased interest in developing the CP ME dipole antennas, as noted in various studies [11]- [14], [17]- [23].…”