Dual-Layer Ridged Waveguide Slot Array Fed by a Butler Matrix With Sidelobe Control in the 60-GHz Band

K. Tekkouk (1) , J. Hirokawa (2) , R. Sauleau (1) , M. Ettorre (1) , M. Sano (2) , M Ando (2)

1 IETR - Institut d'Électronique et des Technologies du numéRique
2 TITECH - Tokyo Institute of Technology [Tokyo]

A novel multibeam antenna based on a 4 × 4 Butler matrix with sidelobe level (SLL) control is proposed in the 60-GHz band. The SLL is controlled using a dedicated circuit composed by four 90-degree couplers with different coupling factors and several cross couplers. This dual-layer antenna is made by hollow waveguides and is assembled using diffusion bonding technique. The radiating part is a compact array of ridged waveguides designed to avoid appearance of grating lobes in the visible range for large scanning angles. The antenna field of view is ±43° with sidelobes lower than -17.5 dB over the entire scanning range. The isolation between the input ports of the Butler matrix is better than 25 dB at the design frequency of 61.5 GHz. The reflection bandwidth for VSWR \textless; 2 is larger than 6.5%. At the design frequency, the measured conductor losses of the antenna are estimated lower than 0.64 dB for all ports

Keywords: Arrays; Butler matrices; Butler matrix; conductor loss estimation; coupling factors; Couplings; cross coupler; diffusion bonding; diffusion bonding technique; Directional couplers; dual layer antenna; dual layer ridged waveguide slot array; frequency 60 GHz; frequency 61.5 GHz; hollow waveguide; matrix algebra; millimeter-wave antenna; millimetre wave antenna arrays; millimetre wave couplers; multibeam antenna; multibeam antennas; multifrequency antennas; Ports (Computers); ridged waveguide; scanning angle; sidelobe level control; SLL; slot antenna arrays; slot array; waveguide couplers

Domains: Engineering Sciences [physics]; Electronics; Computer Science [cs]; Networking and Internet Architecture [cs.NI]

K. Tekkouk, J. Hirokawa, R. Sauleau, M. Ettorre, M. Sano, et al.. Dual-Layer Ridged Waveguide Slot Array Fed by a Butler Matrix With Sidelobe Control in the 60-GHz Band. IEEE Transactions on Antennas and Propagation, 2015, 63 (9), pp.3857--3867. ⟨10.1109/TAP.2015.2442612⟩. ⟨hal-01240771⟩