Compact and Broadband Loop-Loaded Dual-Mode Dipole Antenna

Abstract

A compact and broadband dual-mode dipole antenna is proposed in this paper. Fundamental mode (f₁) is combined with third-order mode (f₃) to widen the bandwidth. To do so, f₃ is compressed/down-shifted close to f₁. This is realized by loading a loop at the current null points of f₃. Loop parameters are the crucial parameters for third-order mode compression and, thus, for wide bandwidth. The antenna was fabricated. Measurements were performed. Simulations and measurements are in good agreement. The prototype of the antenna has an electrical size of 0.33λ_L× 0.08λ_L at the lowest frequency of the operational band. The obtained frequency band for |S₁₁| ≤ −10 dB is 2.83 GHz–6.08 GHz which amounts to 73% bandwidth. The measured peak gain is 3.1 dBi. Stable omnidirectional radiation is obtained over the entire impedance bandwidth.

KEYWORDS:

• Antennas
• Broadband antennas
• Dipole antennas

Disclosure statement

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

Additional information

Notes on contributors

Rajbala Solanki

Rajbala Solanki received a bachelor of technology degree in electronics and communication engineering from the Indian Institute of Information Technology, Design and Manufacturing Jabalpur, India in 2012 and a master of technology degree in communication and signal processing from the Indian Institute of Technology, Bombay, India in 2016. She worked as a guest faculty at the Indian Institute of Information Technology, Kota from July 2016 to May 2017. She was a research scholar at the Department of Electrical Engineering, IIT Bombay from July 2017 to July 2022. She has submitted her PhD thesis and is currently working as a research associate at the Department of Electrical Engineering, IIT Bombay. Her research interests include modelling and design of compact and wideband antennas. Corresponding author. Email: [email protected]

Sharayu Moharir

Sharayu Moharir received a BTech degree in electrical engineering and an MTech degree in communications and signal processing from IIT Bombay in 2009 and a PhD degree in electrical and computer engineering from the University of Texas at Austin in 2014. She is an associate professor with the Department of Electrical Engineering, IIT Bombay. Before joining IIT Bombay, she was Visiting Fellow with the School of Technology and Computer Science, Tata Institute of Fundamental Research (TIFR), Mumbai. Her research interests are modelling and the design of scalable resource allocation algorithms for networks. Email:[email protected]