Patent ID: 9385408
Filing Date: 2016-07-05
CPC Classification: H01P,H05K

Claim Text:
1. A printed circuit board having a transmission line stub that includes a via stub of a conductive via, the printed circuit board comprising: the conductive via having the via stub and a coupling element, the via stub extending to an outer surface of the printed circuit board; a first transmission line configured to transmit a signal coupled to the conductive via at an intersection of the via stub and the coupling element, and wherein the coupling element is configured to transmit the signal from the first transmission line; a line stub electrically coupled to the via stub, an upper surface of the line stub being below the outer surface of the printed circuit board, wherein a length of the line stub is selected such that the transmission line stub having a length including the sum of a length of the via stub and the length of the line stub, is configured to suppress a preselected frequency; and a second line stub coupled to a second via stub of a second conductive via, the second line stub being a wire attached to a surface land of the second conductive via, wherein the preselected frequency is a second harmonic of a fundamental frequency, wherein a first length of the via stub is defined between the transmission line and the line stub, the first length being less than a length of the via stub between the transmission line and an end of the line stub, wherein a sum of time delays of the line stub and the first length of the via stub is substantially equal to one quarter cycle of the second harmonic of the fundamental frequency, wherein the line stub is an unterminated circuit trace on a signal plane that is located below an outer insulating layer of the printed circuit board.