Unbroken Metal Rim MIMO Antenna Utilizing Antenna Clusters

Rasmus Luomaniemi*, Jari Matti Hannula, Riku Kormilainen, Anu Lehtovuori, Ville Viikari

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

24 Citations (Scopus)
192 Downloads (Pure)


This letter presents an antenna system for mobile devices with an unbroken metal rim. By utilizing the characteristic mode analysis for the unbroken metal rim, efficient multiple-input-multiple-output operation can be achieved. The design is based on an antenna cluster technique that uses several coupled elements that are used to efficiently excite the modes of the rim. Nonresonant antenna elements and matching networks are used to couple to the metal rim. The design has small ground clearance of 5 mm and height of only 4 mm, and can operate in wide bandwidths both in 700-960 MHz low band and 1.56-4 GHz high band. Measurement results confirm that competent performance is achieved.

Original languageEnglish
Article number8692408
Pages (from-to)1071-1075
Number of pages5
JournalIEEE Antennas and Wireless Propagation Letters
Issue number6
Publication statusPublished - 1 Jun 2019
MoE publication typeA1 Journal article-refereed


  • Characteristic modes
  • mobile antennas
  • multiple-input-multiple-output (MIMO)
  • unbroken metal rim


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