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A dual‐beam cavity‐backed patch antenna is presented for the future millimetre‐wave (mm‐Wave) fifth generation wireless networks. The proposed antenna comprises a substrate integrated waveguide cavity and a symmetrical patch. The antenna exhibits a bandwidth range from 27.8 to 30.9 GHz with the fractional bandwidth of 10.6%. The radiation patterns are dual beam and peak gains are above 8.4 dB across the passband. Two beam directions are at  + 47° and −47° with respect to the broadside direction. It shows a good agreement between the simulated and measured results.

In this study, a novel cross layout of polarisation conversion metamaterial (PCM) is investigated for the first time. Based on the principle of phase cancellation, the cross structure can reduce radar cross section (RCS) significantly over a wider band compared with the chessboard configuration. The low‐profile metamaterial‐based antenna is composed of the cross PCM structure and a driven patch sandwiched between the PCM patches and the ground plane. Simulated and measured results show that compared with the microstrip patch antenna, the proposed antenna can achieve a wider impedance bandwidth of 6.05–7.52 GHz (21.7%) and milder gain variation in the working band, while the monostatic RCS can be reduced over 5.8–18.0 GHz (102.5%).

Abstract-This paper describes a method of designing Frequency Selective Absorber (FSA) which has a transmission band between two neighboring absorption bands. The proposed FSA is composed of a lossy layer on the top and a lossless layer at the bottom. The transmission characteristic is produced by the parallel LC resonators embedded in the lossy layer while the absorption ability is realized by the lumped resistors constructed in the lossy layer. An equivalent circuit model (ECM) is developed and discussed for a better understanding of this method. An FSA prototype is fabricated and measured for demonstration. Experiments show that the proposed FSA has a transmission band at the center frequency of 8.14 GHz, which agrees well with simulation. Both transmission and refection coefficients from 4.5 GHz to 7.5 GHz and from 9.1 GHz to 11.3 GHz are under −10 dB, which indicate good absorption in these frequency bands. In addition, the performance of the proposed FSA demonstrates a low sensitivity with respect to the polarization of incident EM waves and is maintained well when the incident angles range from 0 • to 45 • .