| 摘要 |
PROBLEM TO BE SOLVED: To obtain satisfactory characteristics even when miniaturizing a balun filter. SOLUTION: An area dividing grounding pattern 161d is formed between a substrate area provided with a first resonator comprising a pattern 222 of an unbalanced transmission line and a pattern 192a of a first balanced transmission line and a substrate area provided with a second resonator comprising the pattern 222 of the unbalanced transmission line and a pattern 192b of a second balanced transmission line, and electromagnetic interference between resonators is suppressed to obtain satisfactory characteristics. Spiral shapes are given to patterns 192a, 192b, and 222 to reduce substrate occupied areas of the resonators, and thus a balun filter can be miniaturized. COPYRIGHT: (C)2006,JPO&NCIPI
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