| 摘要 |
The specified filter circuit consists of at least four resonators which, on the one hand, are coupled directly to one another and in which, on the other hand, design measures are provided by means of which a bridging coupling is achieved. Using such bridging couplings, attenuation poles can be produced in the filter characteristic. It must be possible to set the frequency position of such attenuation poles relatively precisely, in particular also in the case of filters having a relatively large number of resonators. To this end, an additional coupling device, which acts as a concentrated capacitor, is provided in at least one direct coupling.
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