| 摘要 |
A filter for very short electromagnetic waves having a plurality of resonators which are coupled to one another and which are operated in the dualmode. The first and last resonators, as viewed in the direction of energy transmission, are provided with connection lines for the supply and discharge of electromagnetic energy. An additional coupling is provided between at least two filter circuits which are not directly consecutive in the electrical mode of operation and the individual resonators are arranged in juxtaposed rows. The resonators are arranged to be mechanically symmetrical relative to the center of the circuit, and the equivalent circuit diagram on which the construction is based is selected to be asymmetrical in respect of the element values, in such a manner that the number of additional couplings agrees with the theoretically determined, minimum number of additional couplings. The filter may be designed as a transit-time leveled band pass filter having two attenuation poles at finite frequencies in each case above and below the pass band and in which the resonators are arranged in two juxtaposed rows each of which contains three resonators and wherein either four or five additional couplings are provided.
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