H - Electricity – 03 – H
Patent
H - Electricity
03
H
333/40
H03H 7/38 (2006.01) H01P 1/22 (2006.01) H01P 5/02 (2006.01)
Patent
CA 1056921
ABSTRACT OF THE DISCLOSURE This invention relates to impedance matching devices for coaxial cables. Conventional impedance matching devices use rod and disc shaped resistors arranged so that one end of a rod resistor is in electrical contact with the center of either side of the disc resistor. However, the fastening pressure required to maintain this connection tends to cause cracking or damage in the resistors. Therefore, the assembly of the device is critical and difficult. Also the frequencies for which the device can be used are limited by the stray capacitances and inductances inherent in the structure. The present invention aims to offer a coaxial impedance matching device utilizing a card attenuator with thin film resistors, thereby avoiding various defects of conventional impedance matching devices. The invention is comprised of an elongated rectangular film resistor deposited across the middle of a square insulation substrate with a pair of metal strips along opposite edges of the substrate and contacting the ends of the film resistor. Center metalized contacts are made to opposite sides of the film resistor, the lengths of contact with the sides being determined by the impedances of the cables to be connected thereto.
236321
Kusaka Keijiro
Otomo Yasushi
LandOfFree
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