High-frequency circuit device and communication apparatus using the same

摘要

A high-frequency circuit device solves problems caused by a spurious mode reflection generated at a part where propagation of a spurious mode wave is prevented, with the result that propagation of the spurious mode wave such as a parallel plate mode wave is blocked. In the arrangement of the high-frequency circuit device, a spurious mode wave radiated from a transmission line (1) including at least two parallel planar conductors (22) leaks, and the leaked spurious mode wave is reflected by a spurious-mode reflection circuit (3) disposed parallel to the transmission line (1). The distance (W) between the transmission line (1) and the spurious-mode reflection circuit (3) is equivalent to the length in which a wave reflected by the spurious-mode reflection circuit (3) is cancelled by the transmission line (1). <IMAGE>