Patent ID: 8487713
Filing Date: 2013-07-16
Classification: H03F,H03H

Abstract:
1. A multiband matching circuit for matching an impedance Z 1 (f) of a circuit element having frequency characteristics with a predetermined impedance Z 0 of a system circuit in first and second frequency bands when the multiband matching circuit is disposed in a signal path between the circuit element having the impedance Z 1 (f) and the system circuit having the impedance Z 0 , the multiband matching circuit comprising: a first matching unit connected at one end to the circuit element and adapted to convert the impedance of the circuit element to Z a second matching unit which comprises: the parallel matching section being configured to open in impedance the connection point to the signal path in the first frequency band; and the series matching section and the parallel matching section being designed to match the impedance of the circuit element with Z wherein the parallel matching section comprises a first parallel block connected at one end to the signal path and a second parallel block connected at one end to the other end of the first parallel block and grounded at the other end, and the first parallel block is configured to open in impedance at the connection point to the signal path in the first frequency band.