| 摘要 |
<p>A circuit device having a transmission line which suppresses the influence of an unwanted mode and suppresses the deterioration of a propagation characteristic with a simple configuration is provided. The circuit device has electrically conductive strips constituting the transmission line and electrically conductive planes arranged facing the electrically conductive strips in parallel. At least a part of the peripheral outlines of the electrically conductive planes is constructed in a consecutive convex-concave shape composed of a concave part and a convex part. When the wavelength of a propagation mode which is unfavorable for the electrically conductive planes is ?, the interval between the adjacent concave parts of the convex-concave shape of the electrically conductive plane is n/4 times (n is an odd number) as many as the ?. The length of the concave parts of the electrically conductive plane is n/4 times (n is the odd number) as many as the mode wavelength when the component of the ? propagates in the length directions of the concave parts or the length of the convex parts of the electrically conductive plane is n/4 times (n is the odd number) as many as the mode wavelength when the component of the ? propagates in the length directions of the convex parts.</p> |
