Patent ID: 6876840

Claim:
A triplexer for separating an input signal received at an input terminal into signals of first, second and third frequency bands, comprising: a first filter circuit having its one terminal connected to said input terminal, said first filter circuit passing said first frequency band signal; a low pass filter circuit having its one terminal connected to said input terminal, said low pass filter circuit passing a signal of a predetermined frequency band, said predetermined frequency band being lower than said first frequency band; a second filter circuit having its one terminal connected to the other terminal of said low pass filter circuit, said second filter circuit extracting said second frequency band signal from said predetermined frequency band signal; a third filter circuit having its one terminal connected to said other terminal of said low pass filter circuit, said third filter circuit extracting said third frequency band signal from said predetermined frequency band signal, said third frequency band being lower than said second frequency band; and first, second and third output terminals provided respectively at the other terminals of said first, second and third filter circuits for outputting said first, second and third frequency band signals; said low pass filter circuit including a notch circuit for extending a portion of said predetermined frequency band, neighboring said first frequency band.