| 摘要 |
PROBLEM TO BE SOLVED: To decrease interference between resonators for the improvement of isolation. SOLUTION: On the short-circuited end surface 15 of a reception side dielectric filter RX, which has on its end a resonator 14 for attenuation pole formation, a slit 16, where a dielectric is exposed, is formed between the dielectric filter RX and the resonator for attenuation pole formation. Thus the isolation characteristic of transmission/reception within a transmission side pass-band is improved.
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