HIGH FREQUENCY LOW-PASS FILTER

摘要

PROBLEM TO BE SOLVED: To realize a small, low loss and high performance LPF at a low cost by combining an LFP with a high frequency high-pass filter(HPF) or a high frequency band-pass filter(BPF) and using only one diode additionally. SOLUTION: The high frequency low-pass filter comprises a high frequency high-pass filter having an I/O part and a first high frequency low-pass filter having an I/O part wherein the input parts of the high frequency high-pass filter and the first high frequency low-pass filter are connected as an input terminal and the output parts of the high frequency high-pass filter and the first high frequency low-pass filter are connected as an output terminal. The high frequency low-pass filter further comprises a switch circuit for switching the pass band of the high frequency high-pass filter to the block band.