| 摘要 |
PROBLEM TO BE SOLVED: To provide a bandpass filter with suppressed deterioration in a filter damping characteristic and reflection characteristic caused by temperature change, and to provide a transmission and reception device with suppressed disturbance of input-output impedance as radio equipment. SOLUTION: The five-stage bandpass filter has one multimode dielectric resonator 13 and half coaxial resonators arranged outside the dielectric resonator 13. A shielding metal body 101 that is common to the resonators is made of aluminum material, an internal conductor 14 in the half coaxial resonator on the input side is made of ferrous material, and an internal conductor 15 in a half coaxial resonator on the output side is made of invar alloy. COPYRIGHT: (C)2004,JPO&NCIPI
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