A novel device for multimode analysis in oversized waveguides
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An instrument is presented which allows mode analysis of microwaves in oversized waveguides by measuring the spectrum of axial wave numbers. This wavenumber spectrometer consists of a leaky—wave antenna structure in the wall of the waveguide and of a movable receiver antenna with high directivity. From the radiation pattern of the leaky-wave antenna, as measured by the receiver antenna, the spectrum of the modes propagating in the waveguide is deduced.