Compact multiband monopole antenna design for IoT applications

Abstract

In this work, a miniaturized quad-band monopole antenna design is presented for IoT applications. The proposed antenna comprises simple quarter-wavelength I-shaped, an inverted L-shaped, meander lines monopole radiators with microstrip feed line, tapered ground plane having dimension of $32\times 15{\mathrm{mm}}^2$ and fabricated on an FR4 substrate. The radiation characteristics, such as reflection coefficient, VSWR, gain, efficiency, and radiation patterns, are analyzed from simulation and measurement results. The proposed quad-band antenna resonates at 1.8 (1.7–1.96) GHz, 2.4 (2.26–2.47) GHz, 3.35 (3.1–3.7) GHz, and 5.4 (5-5.65) GHz for GSM, WLAN, 5G, WiMAX applications respectively. Further, the proposed antenna has a fractional bandwidth of 14.4% at 1.8 GHz, 8.75% at 2.4 GHz, 17.9% at 3.35 GHz and 12.03 % at 5.4 GHz. It also exhibits omnidirectional radiation pattern with a gain of 1.5, 1.75, 2.5, and 3.7 dbi at 1.8, 2.4, 3.35, 5.4 GHz respectively and >75% total efficiency at its operating bands. The suitability of the designed antenna for IoT applications is validated through the hosting device model with copper sheet and plastic housing. The simulation and measurement results are having good agreement.

Keywords:

• Monople antenna
• multiband antenna
• quad-band
• hosting effect
• IoT

Disclosure statement

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

Additional information

Notes on contributors

Saminathan Thiruvenkadam

Saminathan Thiruvenkadam received his BE degree in Electronics and Communication Engineering from King College of Engg, Tamil Nadu, India (affiliated to Anna University, Chennai) in 2008 and MTech degree in Embedded System and Technology from SRM University, Tamil Nadu, India, in 2012. Presently, he is working as an assistant professor in SRMIST and pursuing PhD degree in the Department of Electronics and Communication Engineering at SRMIST, Chennai, India. His research interests include Monopole antenna design, Multiband antenna, and MIMO antenna design.

Eswaran Parthasarathy

Eswaran Parthasarathy received his Bachelor degree in Electronics and Telecommunication Engineering from the Institute of Engineers (India) in 2000 and, the Masters in Mechatronics in 2003 from Madras Institute of Technology (India) and PhD in Electronics and Communication Engineering from SRM University in 2014. After graduation, he joined the as faculty in Electronics and Communication Engineering at SRMIST (Formerly known as SRM University). His areas of interest are MEMS, VLSI, Device Modeling, EV, PV systems, embedded system, Industry 4.0. He has published over 30 reviewed international journal/conference papers, and two Indian patents. He has served as a reviewer for peer reviewed journals. He is also Fellow member of IE (India), Life member of IETE, ISTE professional bodies.