MATCHING CIRCUIT AND MULTI-LAYER DUPLEXER HAVING THE MATCHING CIRCUIT, CONCERNED WITH REDUCING THE PHYSICAL LENGTH OF CONDUCTOR PATTERN

PURPOSE: A matching circuit and a multi-layer duplexer having the matching circuit, concerned with reducing the physical length of a conductor pattern, are provided to enhance an insertion loss and band pass characteristics by bettering reflection characteristics of an antenna. CONSTITUTION: A transmission filter(60) electrically connected to a transmission terminal(TX) includes a plurality of strip resonance lines for passing a transmission signal therethrough. A reception filter(70) electrically connected to a reception terminal(RX) includes a plurality of strip resonance lines for passing a reception signal therethrough. A transmission matching unit(81) is made of a conductor pattern electrically connected with an antenna electrode(ANTE) connected to an antenna(ANT) and the transmission filter(60). The first ground electrode(GND1) is separated with a certain space in a vertical direction from the conductor pattern of the transmission matching unit(81). A reception matching unit(82) is made of a conductor pattern electrically connected with the antenna electrode(ANTE) and the reception filter(70). The second ground electrode(GND2) is separated with a certain space in a vertical direction from the conductor pattern of the reception matching unit(82). A matching circuit(80) matches with the transmission filter(60) and the reception filter(70).