Abstract: A choke structure including: an inside surface conductive pattern formed in the surrounding of a through hole on the surface of a dielectric substrate opposing a waveguide substrate; an outside surface conductive pattern formed in the surrounding of the inside surface conductive pattern positioned apart therefrom; a conductor opening provided between the inside surface conductive pattern and the outside surface conductive pattern and in which a dielectric member is exposed; a dielectric transmission path short-circuited at an end that is formed by an inner layer conductor, which is provided away from the conductor opening by a predetermined distance in the layer-stacking direction of the dielectric substrate; and a plurality of penetrating conductors, which connect the inner layer conductor to the inside surface conductive pattern.

Abstract: A choke structure including: an inside surface conductive pattern formed in the surrounding of a through hole on the surface of a dielectric substrate opposing a waveguide substrate; an outside surface conductive pattern formed in the surrounding of the inside surface conductive pattern positioned apart therefrom; a conductor opening provided between the inside surface conductive pattern and the outside surface conductive pattern and in which a dielectric member is exposed; a dielectric transmission path short-circuited at an end that is formed by an inner layer conductor, which is provided away from the conductor opening by a predetermined distance in the layer-stacking direction of the dielectric substrate; and a plurality of penetrating conductors, which connect the inner layer conductor to the inside surface conductive pattern.

Abstract: A liquid-sealing type vibration-isolating device has a primary fluid chamber and a subsidiary fluid chamber which communicate with each other through a short idle orifice and a long shock orifice, and a switch-over valve for connecting the primary and subsidiary fluid chambers with each other through the idle orifice in the low speed revolution range of an engine mounted on the device and through the long shock orifice in the medium-high speed revolution range. During the shifting of the switch-over valve, in order to prevent sudden increase in the spring constant of the device, the primary fluid is short-circuited with the subsidiary fluid chamber through a communication port, the inside of a valve member, a communication bore and an auxiliary communication passage.