| 摘要 |
PROBLEM TO BE SOLVED: To realize a bandpass filter that can be easily miniaturized and mass produced. SOLUTION: A high-frequency circuit 100 comprises an upper-left circuit A1, an upper-right circuit A2, and a lower-stage circuit B0; the lower-stage circuit B0 comprises a grounding circuit B1 positioned at the left side, a grounding circuit B2 positioned at the right side, a grounding circuit B3 positioned at the center, 'a line B for connecting the grounding circuit B1 to the grounding circuit B3', 'a line B' for connecting the grounding circuit B2 to the grounding circuit B3'; and the upper-left circuit A1 comprises a port 1 positioned at the left side, a capacitor Ca whose one side is grounded, and a line A for connecting the port 1 to the capacitor C1. For example, the high-frequency circuit 100 is logically configured linearly symmetrically and can be composed of a line that is shorter than a 1/4-wavelength that has been frequently used conventionally, thus easily miniaturizing the bandpass filter. COPYRIGHT: (C)2003,JPO
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