| 摘要 |
An antenna system adapted to operate over relatively wide scan angles is disclosed. The antenna system includes a means for providing a control signal indicative of the relationship between a desired beam deflection angle and a predetermined beam deflection angle, and means, responsive to the control signal, for causing the antenna to operate in the TE11 mode when the desired beam deflection angle is less than the predetermined beam deflection angle thereby to generate a broadside antenna radiation pattern, or the TM01 mode when the desired beam deflection angle is greater than or equal to the predetermined beam deflection angle thereby to generate an end fire antenna radiation pattern. The latter means includes a power divider having a pair of output ports, phase shifter means for providing either O DEG or 180 DEG phase shift between the energy passing through such pair of output ports selectively in accordance with the control signal, and a radiating aperture section including a circular waveguide coupled to the pair of output ports and dimensioned to support either the TE11 mode or the TM01 mode. When such phase shift is 0 DEG the antenna operates in the TE11 mode and when such phase shift is 180 DEG the antenna operates in the TM11 mode.
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