Abstract
Recent years, millimeter wave applications for wireless communication have attracted much attention and expected. We focused on an NRD guide and sapphire which have the excellent low loss characteristics in millimeter wave region. In this paper, an NRD guide excited sapphire disk resonator and millimeter wave bandpass filter with narrow bandwidth using proposed resonators were designed and fabricated. As a result, it was realized that the 3-pole bandpass filter with center frequency 58.64GHz and 3dB bandwidth 273MHz. Moreover, its insertion loss was found to be about 1.5dB.
