| 摘要 |
<p><P>PROBLEM 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. <P>SOLUTION: 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. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
