Flexible antennas have the potential to transform wearable and fabric‐based wireless sensing technologies. The antenna discussed in this study is part of a sensing system that uses the back‐scattered power level as the decision metric. For a good wireless sensor, it is necessary to offer a feasible read range and maintain good distinctions in the back‐scattered power levels between the different states (i.e. level of stretch) of the antenna. Moreover, effects due to human body proximity should be minimised. For these reasons, the radiation efficiency is a crucial parameter to investigate. This study presents the radiation efficiency measurement of the proposed flexible knitted ‘Bellyband’ antenna at two different levels of stretch in a reverberation chamber. This work validates the reverberation chamber measurements through comparison with simulations and anechoic chamber measurements at 900 MHz. Moreover, this work demonstrates how the approach can be used to quantify bellyband antenna efficiency in the vicinity of a human body. Finally, the efficiency results were used to predict the read range of Bellyband radio frequency identification technology.

Design and Fabrication of a Two-Port Three-Beam Switched Beam Antenna Array for 60 GHz Communication as a submission to IET Microwave Antennas and Propagation. This work presents a low-cost, beam-switchable 2 × 10 antenna array system operating at 60 GHz. This antenna system is constructed of two rows of Chebyshev tapered microstrip antenna arrays. Each row is a 10 element series-fed array which are fed by a 90 • coupler. The designed antenna array has only two input ports, but it is capable of generating three switchable beams. This antenna system can spatially scan 90 • with at least-5dB normalized gain using only one SPDT switch and a single transceiver. The maximum gain realized by the system was measured as 16.4 dBi and the bandwidth (BW) was more than 1 GHz. The features of the proposed simple and compact antenna design make it applicable to mmWave beamforming, channel sounding, and handsets for 5G communication. We believe that the novelty of our paper makes it a good contribution to IET Microwave Antennas and Propagation.

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This paper presents a low-cost, beam-steerable 4 × 10 antenna array system operating at 60 GHz. The proposed antenna system is fed by a 4×10 Butler Matrix network designed using microstrip line (ML) structure. Chebyshev tapered microstrip antenna arrays with 10 series-fed elements are connected to four output ports of the feed network. Four steerable beams with maximum 16.5 dBi system gain and 1GHz bandwidth(BW) satisfy the requirements of millimeter wave propagation study and handset application for 5G communication.

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