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Forced surface wave resonances are shown to occur in dielectric-free 45-degree triangular-grid circular waveguide phased arrays. Similar surface wave phenomena were observed in an identical grid array of rectangular waveguides in theH-plane of scan. In the circular waveguide array, however, the resonance is observed in theE-plane and is shown to be an isolated point. This isolation is further illustrated by observing certain vector symmetries in the radiation patterns.
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Amitay et al. (1968) studied this question.
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