A compact five-element printed MIMO antenna with pattern and polarization diversity for 2.45 GHz WLAN applications

Abstract

A five-element pattern and polarization (linear/circular) diversity multiple-input-multiple-output (MIMO) antenna system has been presented in this article for application in 2.45 GHz WLAN. The proposed configuration consists of a circularly polarized (CP) patch antenna element and four monopole antenna elements placed orthogonal to each other. Broadside CP characteristics are achieved by using a square patch antenna with circular chamfered corners and central axis feed. Simple rectangular monopole antenna elements with microstrip line feed produce four linearly polarized (LP) end-fire directive radiation patterns. It achieves a bandwidth (BW) of 24.1% and 5.1% for the end-fire LP antenna element and broadside CP antenna element (corresponding axial ratio BW is 1.64%), respectively, with minimum port isolation of 15 dB. The ECC and CLL are below 0.03 and 0.5 bits/s/Hz, respectively, showing good MIMO performance. Due to its simple design, compact footprint (93 × 93 mm²), planar structure, and competitive features, the proposed antenna is suited for practical WLAN applications.

KEYWORDS:

• Circularly polarized antenna
• MIMO antenna
• monopole antenna
• pattern diversity
• polarization diversity
• wireless LAN application

Disclosure statement

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

Additional information

Notes on contributors

Amar D. Chaudhari

Amar D. Chaudhari was born in Maharashtra, India. He received the BE degree from University of Mumbai, India, in 2014, and the MTech degree from Veermata Jijabai Technological Institute (VJTI), Mumbai, India, in 2017, both in Electronics and Telecommunication Engineering. He worked as a visiting faculty member in Electrical Engineering Department at VJTI, Mumbai, India. Currently, he is working toward his PhD at Defence Institute of Advanced Technology, DRDO, Pune. He has published about 20 research papers in the international/national journals and conference proceedings. His research interest includes printed directional antennas, miniaturized MIMO antennas and broadband techniques for planar antennas.

K. P. Ray

K. P. Ray is M.Tech in Microwave Electronics from University of Delhi and PhD from Department of Electrical Engineering IIT, Bombay. He has over 33 years research/academic experience in the areas of RF and microwave systems/components and was the Program Director of SAMEER (MeitY) Mumbai and has executed over 50 projects sponsored by various Govt. agencies and industries. Recently, he developed A Microwave Sterilizer, ‘ATULYA’ to neutralize COVID19. He received many awards including most coveted IETE-Ram Lal Wadhwa Award-2018, IETE-Ranjna Pal Memorial Award-2014 and several research paper awards. Presently he is the Head of the Dept. of EE, DIAT, Pune.