Abstract
This paper makes a comparison of metal and dielectric millimeter-wave antennas, which are fabricated by 3D printing in complementary structure. These two antennas are designed based on the same tapered slot antenna prototype. It was found that the dielectric antenna excites with extra higher order modes, thus achieves narrower main lobe and lower cross-polarization level than that of the metal antenna. The measured results show that both antennas achieve wide impedance bandwidth of 28.6% over 24-32 GHz, and have similar peak gains of 11.3 dBic and 11.42 dBic respectively. Their fabrication prototypes demonstrate dielectric antenna has a 43% reduction in volume and a 90% reduction in weight, but might suffer from the degraded radiating performance due to the fabrication error.
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