Patent ID: 8189613

Claim:
A high-frequency component comprising: a diplexer including a high-frequency filter and a low-frequency filter connected in parallel with an antenna port, wherein, among transmission/reception signals of a plurality of communication systems using different frequency bands, a high-frequency transmission/reception signal is allowed to pass and a low-frequency transmission/reception signal is attenuated by the high-frequency filter, and the low-frequency transmission/reception signal is allowed to pass and the high-frequency transmission/reception signal is attenuated by the low-frequency filter; a high-frequency circuit cascade-connected to the high-frequency filter in the diplexer; and a low-frequency circuit cascade-connected to the low-frequency filter in the diplexer; wherein the low-frequency filter includes an inductor connected between the antenna port and the low-frequency circuit and is defined by a parallel circuit including the inductor and a first capacitor and a series circuit including the inductor and a second capacitor; transmission characteristics of the low-frequency filter are set by the series circuit and the parallel circuit; and a resonant frequency of all elements of the low-frequency filter is set to be substantially equal to a frequency of a predetermined attenuation pole in frequency characteristics of the high-frequency filter.