Design of a Millimeter-Wave Dual Helix Antenna with Substrate-Integrated Coaxial Line Technology

This paper proposes a dual helix antenna by using the novel substrate-integrated coaxial line (SICL) for millimeter-wave (MMW) applications. The helical part of the antenna is realized with $a\!\!\!\!{=}$ printed metallic strips designed with a certain scaling ratio for axial ratio bandwidth enhancement. The feed utilizes a SICL inverted phase power divider to achieve differential feed. The -10 dB bandwidth of the proposed antenna is from 31GHz to 45.7GHz (38.3%@38GHz), and the axial ratio bandwidth is from 35.4GHz to 41.4GHz (15.6%@38GHz) with a maximum gain of 9.11dBic.