A Planar Printed Four-Element Pattern Diversity MIMO Antenna Based on Novel Quasi-Yagi Elements

Abstract

In this paper, a new planar printed quasi-Yagi antenna with compact size and wide bandwidth is presented for a multiple-input-multiple-output (MIMO) antenna system. Antenna element consists of a rectangular driven monopole, a strip director, and a coplanar ground shorted reflector. A planar rectangular monopole is used for the first time as a driven element instead of a dipole to avoid the implementation complexity of BALUN as it can be fed directly by an unbalanced coaxial feed. It has been shown that the antenna element has an impedance bandwidth (|S₁₁| < −10 dB) of 60.5% ranging from 1.59 to 2.97 GHz. Based on this element, a four-element pattern diversity MIMO antenna is proposed. By utilizing the ground of one element as a reflector for the successive element, a compact size of 109 mm × 109 mm (0.54λ₀ × 0.54λ₀ at 1.5 GHz) has been obtained. Measured bandwidth of 65.9% (1.5–2.97 GHz) with minimum isolation of 13 dB has been achieved. The measured directional patterns and an average gain of 4 dBi, remain stable in the operating band with cross-polarization levels less than −25 dB. The envelope correlation coefficient and channel capacity loss show good diversity performance.

KEYWORDS:

• Broadband antenna
• Low profile antennas
• Multiple-input-multiple-output
• Planar antenna
• Printed rectangular monopole antenna
• Quasi-Yagi antenna

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 Defense Institute of Advanced Technology, DRDO, Pune. He has published about 15 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 MTech 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 programme 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. Email: [email protected]