| 摘要 |
PROBLEM TO BE SOLVED: To achieve a branching filter adaptable to combinations of many frequency bands. ! SOLUTION: A branching filter 1 includes a low-pass filter 10, a first band-pass filter 20, a second band-pass filter 30 and a high-pass filter 40. When the central frequency and the band width of a pass band of the first band-pass filter 20 are denoted by fc1 and BW1, the central frequency and the band width of a pass band of the second band-pass filter 30 are denoted by fc2 and BW2, fc1/BW1 is denoted by Q1, fc2/BW2 is denoted by Q2, √(fc1×fc2) is denoted by fm, and fm/(fc2-fc1) is denoted by P, Q1 is 9.5 or more and 398 or less, Q2 is 10.2 or more and 405 or less, and P is 9.99 or more and 100 or less. ! COPYRIGHT: (C)2015,JPO&INPIT |
