| 摘要 |
PURPOSE:To attain a low loss filter with small size/light weight and ease of adjustment by forming strip conductor to each slot of a dielectric board while its open end is made in the same direction and connecting an input/output terminal and the strip conductor with a conductor spacer and a capacitor. CONSTITUTION:The conductor spacers 23, 24 are provided upright to the open end of the strip conductors 11, 13 at both sides and capacitors 25, 26 connected to outer lead terminals 16, 17 are connected to the spacers. The frequency is adjusted by changing the length of the strip conductors 11-13, the input/ output coupling is adjusted by changing the mounting position of the conductor spacers 23, 24 and the capacitance of the capacitors 25, 26, and the inter-stage coupling is adjusted by changing respectively the size of slots among the strip conductors 11-13 respectively. Since the adjusting position exists all at the exposed side, the adjustment is attained easily. Since the strip conductors 11-13 are formed at the bottom of the slots 18-20, the wavelength reduction rate is increased and small size/light weight of the filter are attained. |
