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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.

This study describes a method for designing miniaturised frequency selective rasorbers (FSRs) with a transmission band located between two adjacent absorption bands. The proposed FSR composes of a bandpass frequency selective surface at the bottom and an absorptive surface (APS) with lumped resistors and parallel LC resonators printed on the top. The absorptive surface is a 2.5‐dimensional geometry for the purpose of miniaturisation. The mounted parallel LC resonators mounted in the APS are utilised to implement the transmission characteristics of the proposed FSR while the constructed lumped resistors in the APS are used to realise the absorption performance. A prototype is fabricated and measured in an anechoic chamber under the guidance of a free‐space measurement system to verify this method. Experiments show that the proposed FSR has a transmission band at the centre frequency of 7.24 GHz and over the bands from 4.85 to 6.82 GHz and from 8.05 to 9.36 GHz, both reflection and transmission coefficients are less than −10 dB. The performances of the proposed FSR with different incident angles and polarisations are also investigated and results show that it is insensitive to electromagnetic wave polarisations and has a stable performance when the incident angles up to 45°.

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