A Wideband Dual-Polarized Dielectric Magnetoelectric Dipole Antenna

• Published in: IEEE transactions on antennas and propagation Vol. 66; no. 10; pp. 5590 - 5595
• Main Authors: Zhang, Zhen-Yuan, Wu, Ke-Li
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.10.2018; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: 45° dual-polarized antennas; Antenna arrays; Antenna measurements; Antenna radiation patterns; Antennas; Bandwidths; Broadband; Dielectric resonator antennas; Dielectric resonator antennas (DRAs); Dielectrics; differential-fed antennas; Dipole antennas; Dual polarization (waves); Electric dipoles; low backward radiation; Magnetic dipoles; magnetoelectric dipole (ME dipole) antenna; Metals
• ISSN: 0018-926X; 1558-2221
• DOI: 10.1109/TAP.2018.2859914

A new wideband ±45° dual-polarized metal loop dielectric resonator magnetoelectric antenna is proposed in this communication. The antenna consists of two orthogonal dielectric bars that support two orthogonal electric dipoles and two cross interlaced metal semi-loops that are equivalent to two orthogonal magnetic dipoles above the ground. With a legitimate combination of the electric and magnetic dipoles, a unidirectional radiation with low backward radiation and equal E-plane and H-plane radiation patterns can be achieved. The antenna can be made of a monolithic dielectric block with simple installation. To validate the new antenna configuration, a prototype is designed, manufactured, and measured. The prototype antenna using ceramic with the electrical size of <inline-formula> <tex-math notation="LaTeX">0.33\lambda _{o} \times 0.33\lambda _{o} \times 0.21\lambda _{o} </tex-math></inline-formula> demonstrates that an impedance bandwidth of 11.4% (<inline-formula> <tex-math notation="LaTeX">\vert S_{11}\vert < -15 </tex-math></inline-formula> dB) in the 3.5 GHz frequency band can be achieved with the measured forward/backward ratio of better than 22 dB. The proposed antenna is suitable as antenna element for massive-MIMO array antennas, where a large number of antenna elements need to be installed in a compact space.