Abstract
Since the communication networks are recently getting to be high-speed broadband, the demand of higher frequency band is increasing up to millimeter-wave bands. Actually, millimeter-waves have already been applied for wireless LAN and so on. In such systems, it is strictly necessary to develop low-loss, wide-band and high attenuation level band-pass filters. Indeed, various kind of millimeter-wave band-pass filter has been proposed. The crystal substrate is suited for millimeter wave substrate because of low dielectric loss and high stability in the millimeter wave region. In this paper, a novel millimeter band-pass filter using crystal substrate is proposed and fabricated. And we examine the transmission characteristics and the temperature behaviors of the proposed filter.
