BALANCED HIGH-FREQUENCY FILTER, COMMON UTILITY ANTENNA, AND BALANCED HIGH-FREQUENCY CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide a balanced high-frequency filter, and common utility antenna in which the same phase signal component is small in a transmission frequency band, and a balanced high-frequency circuit which makes the same frequency signal component small. SOLUTION: The balanced high frequency filter 101 is configured by a balanced high frequency element 102, and a phase shift circuit 103. The phase shift circuit 103 is configured by a transmission line 104, and arranged between output terminals. The transmission line 104 is a serial resonance circuit which resonates on a predetermined frequency for an in-phase signal component which is established as a length which is nearlyλT/2 (λTis a wavelength at a frequency of a transmission frequency band). COPYRIGHT: (C)2006,JPO&NCIPI