Millimeter-Wave Dual-Polarized Filtering Antenna for 5G Application

• Published in: IEEE transactions on antennas and propagation Vol. 68; no. 7; pp. 5114 - 5121
• Main Authors: Yang, Sheng Jie, Pan, Yong Mei, Shi, Li-Yun, Zhang, Xiu Yin
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.07.2020; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: 5G mobile communication; Antenna feeds; Antennas; Band-pass filters; Bandpass filters; Bandwidths; Circuit boards; Dual polarization (waves); Dual-polarized antenna; Electromagnetic wave filters; filtering antenna; Insertion loss; Integrated circuit modeling; Millimeter waves; millimeter-wave (mm-Wave) antenna; Parasitic elements (antennas); Patch antennas; Printed circuits; Prototypes; Selectivity
• ISSN: 0018-926X; 1558-2221
• DOI: 10.1109/TAP.2020.2975534

This article presents a novel dual-polarized millimeter-wave (mm-Wave) patch antenna with bandpass filtering response. The proposed antenna consists of a differential-fed cross-shaped driven patch and four stacked parasitic patches. The combination of the stacked patches and the driven patch can be equivalent to a bandstop filtering circuit for generating a radiation null at the upper band edge. Besides, four additional shorted patches are added beside the cross-shaped driven patch to introduce another radiation null at the lower band edge. Moreover, by embedding a cross-shaped strip between these four stacked patches, the third radiation null is generated to further suppress the upper stopband. As a result, a quasi-elliptic bandpass response is realized without requiring extra filtering circuit. For demonstration, a prototype was fabricated with standard PCB process and measured. The prototype operates in the 5G band (24.25-29.5 GHz) and it has an impedance bandwidth of 20%. The out-of-band gain drops over 15 dB at 23 and 32.5 GHz, respectively, which exhibits high selectivity. These merits make the proposed antenna a good element candidate for the 5G mm-Wave massive MIMO applications to reduce the requirements of the filters in the mm-Wave RF front ends.