Miniaturized wide-band dual-polarized tightly coupled array for 5G millimeter-wave smartphones

Abstract

This paper presents a miniaturized wide-band dual-polarized tightly coupled dipole antenna for 5G millimeter-wave smartphones. The proposed antenna realizes miniaturization to avoid any grating lobes and achieves feed port reduction to reduce cost by utilizing the wideband balanced feeding of planar balun. The operating bandwidth of pol-x is 19.95-45.78 GHz and of pol-y is 20.11-46.32 GHz, which contains the entire dominant 5G millimeter-wave bands for mobile communication. The proposed 1 × 8 array is 23.8 mm × 3.5 mm × 1.297 mm which adapt to the size-limited of 5G smartphones. The peak gain of pol-x is 11.71 dBi and of pol-y is 12.45 dBi. The scanning performance of proposed 1 × 8 array is measured through the test feed powers dividers, which achieve wide beam scanning of around ±60°. The experimental results demonstrate that the proposed array with good performances exhibits great potential for 5G millimeter-wave smartphones application.

KEYWORDS:

• Fifth-generation (5G)
• millimetre-wave (mmWave)
• smartphone antenna
• tightly coupled dipole array (TCDA)

Acknowledgments

This work was supported by OPPO Mobile Telecommunications Corporation Ltd., China.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Notes on contributors

Chan Bai

Chan Bai was born in Hubei province, China, in 1996. She received the B.S. degree in information warfare technology from Xidian University, Xi'an, China, in 2019, where she is currently pursuing the Ph.D. degree in electromagnetic field and microwave technology. Her current research interests include the tightly coupled dipole array (TCDA) antenna, phased array antennas and millimeter-wave antenna.

Shuai Zhang

Shuai Zhang was born in Hubei province, China. He received the B.S. and Ph.D. degrees in electromagnetic field and microwave technique from Xidian University, Xi'an, China, in 2007 and 2012, respectively. He is currently a Professor at the Science and Technology on Antennas and Microwave Laboratory, Xidian University. He has authored or co-authored over 40 refereed journal papers. His current research interests include array antenna design, calculation and control techniques of the radiation and scattering characteristics of antennas, and optimization methods in electromagnetics.

Zixuan Song

Zixuan Song was born in Shaanxi province, China, in 1999. She received the B.S. degree in electronic information engineering from Xidian University, Xi'an, China, in 2020, where she is currently pursuing the Ph.D. degree in electromagnetic field and microwave technology. Her current research interests are planar near-far field transformation and phased array antenna diagnosis method.

Yuguo Liu

Yuguo Liu was born in Henan province, China, in 1996. She received the B.Eng. degree in communication engineering from Zhengzhou University, Zhengzhou, China, in 2018. She is currently pursuing the Ph.D. degree in electromagnetic field and microwave technology, Xidian University, Xi'an, China. Her current research interests include computational electromagnetics, electromagnetic scattering from plasma, array antenna, and antenna decoupling.

Zepu Wang

Zepu Wang was born in Hebei province, China, in 1998. He received the B.S. degree in Electrical information Engineering from the Xidian University, Xi'an, China, in 2021, where he is currently pursuing the Ph.D. degree in electromagnetic field and microwave technology. His recent research interests include a post-processing technique for suppressing extraneous spurious signals during near-field to far-field processing.