| 摘要 |
PROBLEM TO BE SOLVED: To obtain the filter circuit at the termination of which a signal other than harmonics received by the circuit is able to be blocked. SOLUTION: A 2nd open stub 9a having a length to terminate a blocked frequency with a termination resistor by the whole stub is branch-connected to a short-circuit position for a desired frequency in 1st open stubs 7a, 8a whose length is an integer multiples ofλ/2 of a desired frequency and which are connected in series with the termination resistor 5 that is connected in parallel with a line 6 interconnecting an input terminal 1 and an output terminal 2 and having a length ofλ/4 with respect to the blocked frequency. Furthermore, a 4th open stub 9b having a length to short-circuit the blocked frequency by the whole stub is branch-connected to a short-circuit position for the desired frequency in 3rd open stubs 7b, 8b whose length is an integer multiple ofλ/2 of the desired frequency and which are connected in parallel with the output terminal 2 and having a length ofλ/2 of the desired frequency.
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