Suppression of mutual coupling in rectangular dielectric resonator antenna arrays using Epsilon-Negative metamaterials (ENG)

ABSTRACT

A double slotted symmetrical split ring resonator with an inductive stub in its inner ring is presented as a Single Negative Electric (SNG) metamaterial to suppress mutual coupling between two E-plane coupled microstrip line fed rectangular dielectric resonator antenna (RDRA) array. The proposed SRR exhibits two resonant frequencies and wide stop-bands. The -10 dB bandwidth of S₂₁ from 2022MHz to 2720 MHz and from 2187 MHz to 3839 MHz are obtained for the first structure, #1, and the second structure, #2, respectively. By introducing an ENG layer between the two RDRAs, the experimental reduction in mutual coupling is more than 23 dB with a small frequency shift (∼ 20 MHz), while the impedance matching is improved. The radiation efficiency and total efficiency are increased while the far-field pattern in the E-plane is not disturbed.

KEYWORDS:

• DRA
• mutual coupling
• rectangular dielectric resonator antenna
• single-negative (SNG) metamaterial

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Notes on contributors

Maryam Rezapour

Mariam Rezapour received her BS and MS degrees from K. N. Toosi University and Tabriz University, respectively. She is currently a PhD candidate in communications. Her research interests include antennas and analytical and numerical modeling of metamaterials.

Jalil A. Rashed-Mohassel

Jalil A. Rashed-Mohassel received his MS from University of Tehran and his PhD in 1982 from University of Michigan, Ann Arbor. He is a professor at University of Tehran and the recipient of several university and national prizes. His research interests include antennas, EM theory and Applied Mathematics.

Asghar Keshtkar

Asghar Keshtkar received his BS, MS, and PhD degrees from University of Tehran, K. N. Toosi University and Iran University of Science and Technology, respectively. He is currently an associate professor at Imam Khomeini International University. His research interests include Electromagnetics and antennas.

Mohammad-Naser Moghadasi

Mohammad-Naser Moghadasi received his BS and PhD degrees from Leeds Metropolitan University and Bradford University, respectively. He is currently a professor at Islamic Azad University, Science and Research Branch, Iran. His main areas of interest are antennas and microwave passive and active circuits.