HIGH FREQUENCY DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a high frequency device capable of preventing deterioration of the receiving sensitivity of another terminal device even when a transmission frequency band newly added to the side of a terminal device is arranged close to a current receiving frequency. SOLUTION: In a band-pass filter to be used for a transmission circuit, respective terminals of the first band-pass filter 1 of a first transmission frequency band and the second band-pass filter 2 of a second transmission frequency band are connected with each other to make an input terminal. The other terminals of the filter 1 and one terminal of a third band-pass filter 3 of the first transmission frequency band are connected with each other. The other terminal of the second band-pass filter and one terminal of a fourth band-pass filter 4 of the second transmission frequency are connected with each other. Respective terminals of the filter 3 and the filter 4 are connected with each other to make an output terminal. Thus, the noise in a receiving frequency band generated in a transmission circuit is surely suppressed.