Patent ID: 7496332
Filing Date: 2009-02-24
Classification: H03H

Abstract:
1. A diplexer comprising: a common terminal connected to an antenna; a first input/output terminal for inputting/outputting signals in a plurality of high frequency bands higher than a predetermined frequency; and a second input/output terminal for inputting/outputting signals in a plurality of low frequency bands lower than the predetermined frequency, wherein, between the common terminal and the first input/output terminal, a high pass filter and a plurality of low trap circuits for attenuating the plurality of low frequency bands respectively are interposed in series in which a series resonance frequency of the plurality of low trap circuits and an inductive element of the high pass filter is between the plurality of low frequency bands attenuated by the plurality of low trap circuits, the number of low frequency bands to be attenuated is larger than the number of low trap circuits and, wherein, between the common terminal and the second input/output terminal, a low pass filter and a plurality of high trap circuits for attenuating the plurality of high frequency bands respectively are interposed in series in which a series resonance frequency of the plurality of high trap circuits and a capacitive element of the low pass filter is between the plurality of high frequency bands attenuated by the plurality of high trap circuits, the number of high frequency bands to be attenuated is larger than the number of high trap circuits.