Maryam Rezapour
@iauctb.ac.ir
Department of Electrical and Computer Engineering, Science and Research Branch
Islamic Azad University,
Tehran, Iran
RESEARCH INTERESTS
electromagnetic waves and fields - metamaterials - antenna
Scopus Publications
Scholar Citations
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Scopus Publications
Maryam Rezapour, Jalil Rashed‐Mohassel, Asghar Keshtkar, and Mohammad Naser‐Moghadasi
Wiley
Correspondence Jalil Rashed-Mohassel, Center of Excellence on Applied Electromagnetic Systems, School of ECE, College of Engineering, University of Tehran, Tehran, 1439957131, Iran. Email: jrashed@ut.ac.ir Abstract A wideband epsilon-negative structure is employed as one-layer and two-layer isolators to reduce mutual coupling in multiple-input multiple-output systems composed of two E-coupled rectangular dielectric resonator antennas. The proposed unit cell with −15 dB bandwidth for S21 extending from 1970 to 3317 MHz, is a double slit complementary split ring resonator etched on the ground plane of a stripline. Each layer is composed of a 2 × 3 array of the suggested unit cell. Reduction in isolation of more than 11 dB for the one-layer case and higher than 20 dB for the two-layer case are measured within the frequency range of 2.604 to 2.64 GHz which includes WiMAX. The highest isolation level of 36 dB is realized at 2.868 GHz. The impedance matching, gain, radiation efficiency, and envelope correlation are improved compared to the original case. A prototype is designed, fabricated, and tested. Simulation data and measurement results are in good agreement.
Maryam Rezapour, Jalil A. Rashed-Mohassel, Asghar Keshtkar, and Mohammad-Naser Moghadasi
Informa UK Limited
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.