Abstract
Metal embedded grid artificial dielectric resonator antennas (GDRAs) fed by different coplanar waveguide (CPW) feeding techniques at mm-wave frequencies are investigated in detail. GDRAs involve embedding tall nickel metal inclusions in polymethyl-methacrylate (PMMA) using deep X-ray lithography and electroforming, which dramatically increases the effective permittivity of the polymer up to 5-6 times and results in miniaturized antenna structures operating at millimeter-wave frequencies. The options for different coplanar waveguide (CPW) feeding at 22.6-26.6 GHz and 26.6-29.3 GHz are studied by applying a thin 300 μm PMMA layer between the feed layer and metal inclusions of the GDRA to avoid short-circuiting the underneath feed line structures. In addition, this results in a GDRA structure that improves the impedance bandwidth up to 16.26%, while providing a maximum realized gain of 7.2 dBi across the frequency band with excellent broadband patterns and −18 dB cross-polarization levels.
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