Abstract: An antenna/filter combiner for connecting a plurality of frequency transmission signals to an antenna having an arrangement with n circulators connected in a waveguide with m transmission channels being supplied thereinto via respective combining networks composed of sub-filters to provide a reactance free combination of n.multidot.m transmission frequency channels.

Abstract: The disclosed waveguide branch separating filter can be modularly constructed of a basic frequency separating filter and of a filter expansion unit. Both the basic frequency separating filter as well as the filter expansion unit are composed of a reactively terminated (including short circuit) feeder waveguide to which the separating filters are coupled. The expansion of the basic frequency separating filter occurs in largely disturbance-free fashion during operation in that the reactive termination (including short circuit) thereof is mechanically replaced by the filter expansion unit and is electrically simulated during the refitting by a short-circuit plate or by short-circuit pins.

Abstract: A filter for very short electromagnetic waves is disclosed in which a plurality of resonators are formed in a row with each resonator containing two filter circuits. The resonators are operated in a dual mode and the filter circuits are arranged in an electrical sequential manner. First and last filter circuits in a direction of the transmitted energy are provided with input and output lines, respectively. At least one additional coupling is provided between at least two filter circuits which do not directly follow one another in electrical sequential fashion. At least one of the resonators provides two filter circuits which are not adjacent with respect to one another in electrical sequential fashion and are coupled via an additional coupling.

Abstract: 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.