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A broadband and high gain transmit array (TA) antenna, operating at 60 GHz, is proposed. To meet the design requirements of a TA antenna with polarisation‐insensitive radiation performance, an optimal multi‐layer unit cell (UC) is introduced. The dimensions of the UC are parametrically expressed to realise a linear transmission phase response with a variation range of 270° and insertion loss <−3 dB over the desired frequency band ranging from 58 to 64 GHz. A new planar array composed of 2 × 4 aperture‐coupled‐patches interleaved with a soft‐surface is also designed as a feed for the proposed TA. Furthermore, a hybrid method based on full‐wave simulations and analytical formulations is developed to calculate the radiation characteristics of the TA antenna and the results are compared to the ones achieved with full‐wave simulations. The designed TA antenna is fabricated and the measurement results are presented. The obtained results show peak aperture efficiencies of 38.48% (30.85 dB peak gain) and 32.37% (30.1 dB peak gain), and −1 dB gain bandwidths of 7.7 and 8.2% from the full‐wave simulations and measurements, respectively. Such a broadband and high gain antenna is deemed to be suitable for mm‐wave backhaul links in 5G cellular systems.

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