Abstract
We show a metal hole array (MHA) with wavelength-sized periodic apertures in a metal plate can be applied as an antenna gain enhancer in the millimeter-wave range. In the proof-of-concept experiment, the MHA was placed in front of the horn antenna (gain: 23 dBi) and antenna gain enhancement and the wavefront conversion were demonstrated, where the spherical wavefront of the millimeter-wave (125 GHz) was transformed into a planar shape by the MHA. We experimentally demonstrated that the MHA enhances the antenna gain by approximately 1.9 dB. The bandwidth of the gain enhancement was approximately 1.2 GHz.
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