We present here a novel architecture of high-gain CTS (continuous transverse stub) antenna array operating at Eband (71-86GHz) with reduced side lobe level (SLL). The antenna consists of an array of 16 long slots excited by a non-uniform parallel-plate waveguide (PPW) corporate feed network. The nonuniform excitation is achieved by the design of asymmetrical power dividers in PPW technology, for which simple analytical models are provided. Full-wave simulations are validated by measurements of a prototype fabricated in aluminum. The SLL is lower than -28 dB in E-plane. Such a SLL is 15 dB lower than classical parallel-fed CTS arrays. The overall antenna SLL remains below -18 dB over the 75-86 GHz band. Its mean radiation efficiency is 60% and a maximum efficiency of 85% is reached at 86 GHz.
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