Patent ID: 9577304
Date: 2017-02-21
CPC Classifications: H01P,H03H,H05K

Claim:
1. An attenuation reduction structure for high-frequency connection pads of a circuit board with an insertion component, wherein: the circuit board comprises a substrate, the substrate comprising a lower surface, an upper surface, a first end, a second end, and an extension section connected between the first end and the second end, the extension section extending in an extension direction; at least one pair of lower connection pads are formed on a lower surface of the substrate to be adjacent to and spaced from each other; at least one pair of upper connection pads are formed in a via arrangement zone defined in an upper surface to the substrate to be adjacent to and spaced from each other and respectively corresponding to the lower connection pads; at least one pair of differential mode signal lines are formed on the extension section of the substrate to be adjacent to and spaced from each other and respectively connected to the adjacent upper connection pads, the at least one pair of differential mode signal lines transmitting at least one high-frequency differential mode signal, a site where the differential mode signal lines and the upper connection pads are connected to each other being defined as a transition zone; a plurality of vias is arranged in the via arrangement zone, the vias respectively extending through and connected to the upper connection pads and the lower connection pads; and the insertion component comprises a component body and a plurality of insertion pins extending from the component body; characterized in that: the lower surface of the substrate comprises a first metal layer formed thereon, the first metal layer comprising an attenuation reduction grounding pattern structure formed at a location corresponding to the transition zone, the attenuation reduction grounding pattern structure comprising: a hollow area, which corresponds to the via arrangement zone, the hollow area covering the transition zone; and at least one pair of protruded portions, which extends from the first metal layer in a direction toward the lower connection pads so as to extend a predetermined length to the transition zone and respectively correspond to the differential mode signal lines.