| 摘要 |
The object of the invention is a coaxial resonator structure which enables the realisation of a high frequency filter, which has a small height and is realised with coaxial resonators. The frequency tuning means and the coupling tuning means of the resonator are realised with the aid of projections. The frequency tuning means adjusts the coupling of the resonator's open end to the outer wall or to the partition of the resonator structure, and the coupling tuning means adjusts the coupling of the resonator's open end to another resonator of the resonator structure or to the input or output of the resonator structure. The tuning means are preferably sheet-like projections. At the same time the tuning means act as capacitive loads, whereby it is possible to shorten the resonator's physical length compared to an unloaded resonator. Most preferably the frequency tuning means and the coupling tuning means are realised as projections of a single sheet-like component, whereby a resonator according to the invention is formed by two parts: a resonator and a capacitive loading part fastened to it, whereby the loading part at the same time acts as a frequency tuning means and a coupling tuning means. In a resonator structure of this type the tuning of the resonance frequency and the tuning of the coupling between the resonator circuits are combined by using a single mechanical part so that the tuning operations are mutually almost independent, both electrically and mechanically, whereby the tuning of the coupling and of the frequency substantially do not affect each other. |
