| 摘要 |
PROBLEM TO BE SOLVED: To provide a noise filter which is capable of attenuating noises much in a receiving frequency band and a high-frequency transmitter using the same. SOLUTION: A main microstrip line 21 where signals are inputted through its one end and then outputted from its other end is formed on a board, auxiliary microstrip lines 22, 23, 24, 25 and 26 are made to cross the main microstrip line 21, the lengths of the auxiliary microstrip lines 22 to 26 from their intersections with the main microstrip line 21 to their ends are set different from each other. The auxiliary microstrip lines 22 to 26 are so formed as to be rectangular, all equal to each other in width, and arranged at prescribed intervals and nearly in parallel with each other.
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