Beam-scanning leaky-wave antenna based on CRLH-metamaterial for millimetre-wave applications

This paper presents empirical results of an innovative beam-scanning leaky-wave antenna (LWA), which enables scanning over a wide angle from ¿ 35° to + 34.5° between 57 and 62 GHz, with broadside radiation centred at 60 GHz. The proposed LWA design is based on composite right/left-handed transmission-line (CRLH-TL) concept. The single-layer antenna structure includes a matrix of 3 × 9 square slots that is printed on top of the dielectric substrate; and printed on the bottom ground-plane are ¿- and T-shaped slots that enhance the impedance bandwidth and radiation properties of the antenna. The proposed antenna structure exhibits metamaterial property. The slot matrix provides beam scanning as a function of frequency. Physical and electrical size of the antenna is 18.7 × 6 × 1.6 mm3 and 3.43¿0 × 1.1¿0 × 0.29¿0, respectively, where ¿0 is free space wavelength at 55 GHz. The antenna has a measured impedance bandwidth of 10 GHz (55¿65 GHz) or fractional bandwidth of 16.7%. Its optimum gain and efficiency are 7.8 dBi and 84.2% at 62 GHz. © The Institution of Engineering and Technology 2019.

antenna grounds bandwidth dielectric materials directional patterns (antenna) electric impedance metamaterial antennas metamaterials microwave antennas millimeter waves scanning slot antennas traveling wave antennas broadside radiations composite right/left-handed transmission lines dielectric substrates fractional bandwidths free-space wavelengths function of frequency millimetre wave applications radiation properties scanning antennas

Beam-scanning leaky-wave antenna based on CRLH-metamaterial for millimetre-wave applications Articles