Metamaterial inspired electrically small antennas with enhanced bandwidth and multi- band compatibility

The invention of a miniaturized antenna that can support multiple frequency bands with efficient bandwidth is very crucial for communication applications. In this work, a novel approach is demonstrated wherein the combination of various metamaterial configurations leads to significantly increase the number of frequency bands and also the bandwidth level. Initially, an ordinary patch antenna, exhibiting narrowband performance at 2.8 GHz and 9.5 GHz, is considered and optimized for reference. By applying different metamaterial architectures like a complementary dual negative metamaterial (CDNG-MTM) or its combination with two split-ring resonators (SRR) alongside the patch structure, a rising in number of bands from two to four and then five is observed in a sequential manner. Every time the k _a value (indicator of antenna size) is found to be below one and the electrical size as compact. A CDNG-MTM joining with the patch originated four different bands with bandwidths of 1.75GHz, 1.175GHz, 0.185GHz, and 0.54GHz at 2GHz, 6.8GHz, 9.1GHz, and 9.6GHz, respectively, which can be feasible for next generation high-speed wireless communication, high-resolution radar, earth observation satellites etc. Lastly, the addition of SRRs leads to five operational bands along with 22% more enhancement in overall bandwidth.