| 摘要 |
PURPOSE:To improve the yield of a product by easily enabling a resonance frequency or a central frequency to be adjusted to a lower range by providing a notch on a resonator using a dielectric substrate or the capacitor electrode pattern of a BPF using the resonator. CONSTITUTION:The capacitor electrode patterns 2a and 2b, and 3a and 3b, and coil patterns 4a and 4b are formed on both planes of the dielectric substrate. To adjust the resonance frequency, notch parts A1, A2, B1, and B2 are provided at the connection part of the capacitor electrode pattern and the coil pattern, and also, the inside of the capacitor electrode pattern, on the both surface and rear planes of the dielectric substrate. By providing such notches, coil pattern can be increased, and an inductance L is increased, therefore, the resonance frequency can be lowered. Also, by adjusting the length and the width of the notch, the fine adjustment of the resonance frequency can be performed.
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