Investigation on the performance of low‐profile insensitive antenna with improved radiation characteristics for the future 5G applications

Abstract

A new method to design an insensitive antenna with improved performance for fifth generation (5G) systems is proposed in this letter. In order to improve the antenna performance and also eliminate the effect of high‐loss FR‐4 substrate, the resonator of the conventional slot antenna has been converted to the air‐filled slot‐loop structure with a thickness of hsub. Since the main substrate of the resonator is the air, the antenna is insensitive for different values of permittivity, loss tangent characteristics of the substrate. So, for different kinds of substrates, the antenna has a same performance in terms of maximum gain, radiation and total efficiencies. The antenna is designed and fabricated on a low‐cost FR4 substrate and has more than 90% (−0.5 dB) radiation and total efficiencies at 22.25 GHz (center frequency). It has the reflection coefficient (S11) less than −10 dB in the frequency range of 21–23.5 GHz (more than11% fractional bandwidth) which is one of the candidate bands for future 5G communications. The antenna has a very compact size and could be used in mm‐wave phased arrays. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2148–2151, 2016

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