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FREQUENCY SCANNING ANTENNAS
WASHINGTON UNIV SEATTLE COLL OF ENGINEERING
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The theory is presented of 180 degree scanning for a linear array and Tchebyscheff array by frequency variation and the relationships between the linear array theory and the diagram of periodic structures is discussed. Each element is excited by an equivalent slow wave structure which is either non-dispersive or dispersive. At a center frequency, the spacing is an integral multiple of guide wavelength. For a given frequency range, the necessary phase velocity and other parameters are determined in order to obtain 180 degree scanning without causing other main beams. An example is carried out for the X-band frequency range. Author
APPROVED FOR PUBLIC RELEASE