Patent ID: 6784780
Filing Date: 2004-08-31
Classification: H01F,H05K,Y02P

Abstract:
A coupling adjusting structure for a double-tuned circuit, comprising:a printed circuit board; a first tuned circuit comprising a first coil formed by a combination of first and second conductive patterns formed on first and second surfaces of the printed circuit board, respectively; and a second tuned circuit comprising a second coil formed by a combination of third and fourth conductive patterns formed on the first and second surfaces of the printed circuit board, respectively, wherein the first coils is configured such that the first conductive patterns formed on the first surface of the printed circuit board and the second conductive patterns formed on the second surface of the printed circuit board are connected to each other via first connecting conductors, the second coil is configured such that the third conductive pattern formed on the first surface of the printed circuit board and the fourth conductive pattern formed on the second surface of the printed circuit board are connected to each other via second connecting conductors, the first coil and the second coil are disposed close to each other with a gap therebetween so that inductive coupling is provided, at least one first ground conductive pattern is disposed at least on the first surface of the printed circuit board, the first ground conductive pattern has a first protruding conducting pattern which extends through the gap, and at least one first jumper connected to the first protruding conductive pattern is disposed between the first and second coils so as to adjust the inductive coupling of the double-tuned circuit.