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This article reports on an efficient technique of using modified complementary split ring resonator metamaterial structures for enhancing isolation between the elements of densely packed microstrip phased array. A two element E‐coupled microstrip phased array operating at 3.7 GHz with edge‐to‐edge element separation of 0.125 λo is realized. The proposed decoupling technique is analyzed by placing the metastructure in between the antennas on the patch layer as well as by etching it in the ground plane. Isolation enhancement of 14.6 dB is achieved when the metastructure is introduced on both top and bottom sides of the antenna array. The measured mutual coupling of −37.1 dB and return loss of −20.7 dB is demonstrated. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:759–763, 2015

This study presents a tailored metamaterial structure for mutual coupling suppression in the E coupled microstrip phased arrays. Configured slot combined complementary split ring resonator (SCCSRR) is proposed for decoupling. A detailed analysis of the suppression characteristics of SCCSRR is presented along with its design methodology and parametric analysis. The SCCSRR pairs have been integrated with the microstrip phased array on surface and in the ground plane without any added fabrication complexity. The proposed design offers additional coupling suppression of 19 dB as compared with non-decoupled array of same dimension. The coupling suppression of −42 dB for 3.7 GHz array has been achieved successfully. The element separation is kept at 0.5 λ o and the complete design with two radiating elements measures 84 × 44 mm 2 .

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