HIGH FREQUENCY DEMULTIPLEXER CIRCUIT, A HIGH FREQUENCY COMPONENT WITH THE SAME PACKAGED THEREIN, HIGH FREQUENCY MODULE AND RADIO COMMUNICATION APPARATUS

摘要

PPROBLEM TO BE SOLVED: To make a high frequency demultiplexer circuit low in loss and small in size by replacing a phase shift circuit PSC of the high frequency demultiplexer circuit with other small circuit. PSOLUTION: This circuit is provided with a low-pass filter and a high-pass filter HPF1 each including an inductance element and a capacitance element. The low-pass filter is configured by cascading a first low-pass filter circuit LPF1 with a ground capacitor C3 formed in one end of a notch circuit configured by parallel connecting a transmission line L1 comprising the inductance element and the capacitance element C1, and a second low-pass filter circuit LPF2 including the same configuration. An attenuation pole of one low-pass filter circuit is set to a frequency that is approximately the double of a pass frequency band of the low-pass filter, and an attenuation pole of the other low-pass filter is set to a frequency that is approximately (n) (n) times of the passing frequency band of the low-pass filter. PCOPYRIGHT: (C)2005,JPO&NCIPI