Frequency Tuning Range Expansion for the Millimeter-wave Band Tunable Filter

Abstract

For the realization of the smart community, the IoT and sensor technology in the millimeter-wave band is necessary. The development of these technologies requires accurate spectrum analysis in the frequency domain over 100 GHz. A tunable pre-selection filter is a key device in building such a spectrum analyzer. In this paper, we propose use of a ridge waveguide to achieve frequency tuning over a wider bandwidth. In addition, we demonstrate an example design and prototype for a filter with a relative bandwidth of 38 % (75 GHz to 110 GHz) and 32 % (78.1 GHz to 107.5 GHz) respectively.