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An analytical expression for the coupling between a rectangular waveguide and a stripline, coupled together through a number of narrow rectanglar slots, is derived. An investigation, on coupling through a long slot used as an element of a multi-aperture coupler is presented. Design for a 10 dB directional coupler using the best number of apertures is formulated. The results compare well with experimental data.
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Kumar et al. (1976) studied this question.
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