8-port semi-circular arc mimo antenna with an inverted l-strip loaded connected ground for uwb applications

Tathababu Addepalli, Arpan Desai, Issa Elfergani*, N. Anveshkumar, Jayshri Kulkarni, Chemseddine Zebiri, Jonathan Rodriguez, Raed Abd-Alhameed

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

Multiple-input multiple-output (MIMO) antennas with four and eight elements having connected grounds are designed for ultra-wideband applications. Careful optimization of the lines connecting the grounds leads to reduced mutual coupling amongst the radiating patches. The proposed antenna has a modified substrate geometry and comprises a circular arc-shaped conductive element on the top with the modified ground plane geometry. Polarization diversity and isolation are achieved by replicating the elements orthogonally forming a plus shape antenna structure. The modified ground plane consists of an inverted L strip and semi ellipse slot over the partial ground that helps the antenna in achieving effective wide bandwidth spanning from (117.91%) 2.84–11 GHz. Both 4/8-port antenna achieves a size of 0.61 λ × 0.61 λ mm2 (lowest frequency) where 4-port antenna is printed on FR4 substrate. The 4-port UWB MIMO antenna attains wide impedance bandwidth, Omni-directional pattern, isolation >15 dB, ECC < 0.015, and average gain >4.5 dB making the MIMO antenna suitable for portable UWB applications. Four element antenna structure is further extended to 8-element configuration with the connected ground where the decent value of IBW, isolation, and ECC is achieved.

Original languageEnglish
Article number1476
Number of pages19
JournalElectronics (Switzerland)
Volume10
Issue number12
DOIs
Publication statusPublished - 19 Jun 2021
Externally publishedYes

Keywords

  • 4-elements
  • 8-elements
  • ECC
  • Isolation
  • MIMO
  • UWB

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