Single Ring Slot-Based Antennas for Metal-Rimmed 4G/5G Smartphones

Research output: Contribution to journalArticleScientificpeer-review


  • Quangang Chen
  • Huawei Lin
  • Jianpeng Wang
  • Lei Ge
  • Yujian Li
  • Tianqi Pei
  • Chow-Yen-Desmond Sim

Research units

  • Feng Chia Univ, Feng Chia University, Dept Elect Engn
  • Shenzhen University
  • Nanjing University of Science and Technology
  • Beijing Jiaotong University


In this paper, multiband antennas based on a single ring slot are proposed for 4G/5G smartphone applications. The basic structure of the antenna is consisted of a large metal ground and an unbroken metal rim, in which a single 2 mm-wide ring slots is realized between the metal ground and rim. Here, a reconfigurable 4G antenna (820-960 and 1710-2690 MHz) is initially devised by loading multiple grounded stubs and a simple dc controlling circuit with varactor diode into the upper section of the ring slot. To further cover the sub-6 GHz spectrum (3400-3600 MHz) for future 5G communications, a four-element multi-input multi-output (MIMO) slot antennas configuration is designed by utilizing the lower section of the ring slot. A prototype antenna was fabricated, and good agreement is shown between the measured and simulated results. Due to the advantages such as multiband operation, MIMO configuration for 5G communications, high isolation, and compact structure, the proposed antenna design is attractive for 4G/5G smartphones.


Original languageEnglish
Pages (from-to)1476-1487
Number of pages12
JournalIEEE Transactions on Antennas and Propagation
Issue number3
Publication statusPublished - Mar 2019
MoE publication typeA1 Journal article-refereed

    Research areas

  • 4G/5G, metal rim, multi-input-multi-output (MIMO), reconfigurable antenna, slot antenna, WWAN/LTE, DUAL-LOOP ANTENNA, MONOPOLE ANTENNA, MULTIBAND, DESIGN, SYSTEM, ARRAY

ID: 39549023