Abstract
This paper proposes on an effective mutual coupling suppression technique for planar phased array. This is achieved locating a metamaterial superstrate patch between radiation elements of phased array. The superstrate patch is realised by incorporating slots inside the patch, where the slots are arranged in 2×3 array column. The proposed mutual radiation decoupling technique is implemented on FR-4 substrate. Average coupling suppression of 5 dB is achieved on a low permittivity substrate over its operational frequency band. The proposed technique is (i) simple to implement; (ii) planar design; (iii) easily realised in practice; (iv) overcomes the shortcomings of poor front-to-back ratio previously reported in other radiation suppression techniques; and (v) applicable for densely packed microstrip. Furthermore, the proposed planar technique is highly versatile for various applications having stringent performance requirements.
Highlights
Microstrip antennas have become popular in wireless communication systems, because of their light weight, low profile, and ease to design antenna array [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15]
With the growing needs for compact array antennas, the footprint of the array antenna becomes smaller and the performance of the array antennas such as radiation pattern and antenna gain is significantly degraded by strong mutual coupling and cross talks between neighboring antenna elements
In paper [20] [21], mutual coupling reduction is achieved by introducing walls with mushroom PBG etched on them that are located between antenna elements
Summary
Microstrip antennas have become popular in wireless communication systems, because of their light weight, low profile, and ease to design antenna array [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15]. In paper [20] [21], mutual coupling reduction is achieved by introducing walls with mushroom PBG etched on them that are located between antenna elements. In [24], DGS is etched off in the ground plane to reduce mutual coupling between two parallel individual planar inverted F antennas (PIFAs). In another technique presented in [25] complementary split-ring resonators (CSRRs) are etched away from the substrate ground plane in a location between two patch antennas. In this paper a mutual coupling suppression technique is described that is applicable for densely packed microstrip array antennas. Reduction in mutual coupling is realised by inserting a metamaterial superstrate patch between adjacent radiation elements. The proposed technique is shown to accomplish 5 dB reduction in the mutual coupling between two patch antennas with no degradation in radiation characteristics
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