| 摘要 |
A duplexing filter suitable for use in a mobile communication system. The filter has a core of dielectric material with several through holes that define resonators. The core has metallized surfaces except for a portion of the top and bottom surfaces. At least one metallized resonator pad surrounds through holes on the top and bottom surfaces. A metallized serpentine region extends from the resonator pad on the bottom surface toward a side surface of the core. The metallized serpentine region causes attenuation of a third harmonic frequency.
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