Patent ID: 6985056
Filing Date: 2006-01-10
Classification: H01L,H01P,H05K

Abstract:
1. A high-frequency circuit formed on a surface of a dielectric substrate, comprising: a signal strip formed on a first face of the dielectric substrate for transmitting a signal therethrough; a pair of ground strips formed on the first face astride the signal strip, with an interspace on each side of the signal strip; a ground conductor layer formed on a second face of the dielectric substrate, the second face being opposite to the first face; and a plurality of through-vias formed in the dielectric substrate astride the signal strip for electrically connecting the pair of ground strips to the ground conductor layer, wherein, among the plurality of through-vias, first and second through-vias which are a pair of opposing through-vias located closest to a terminating end of the signal strip are disposed apart from each other by a distance smaller than a distance between any other pair of opposing through-vias, the distance between the first and second through-vias is less than ½ of an effective wavelength corresponding to a designed frequency, and the distance between any other pair of opposing through-vias is equal to or less than ½ of the effective wavelength corresponding to the designed frequency.