Spiral antenna with adaptive radiation pattern under electronic control
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Variations are introduced in the current flow of the outer circumference of the spiral antenna by applying short circuits at different points on this section of the antenna. Both one-point and two-point short-circuits are considered. It is shown that the direction of the antenna beam is a function of the position of the short-circuit(s), with the gain staying uniform within /spl plusmn/1 dB and VSWR changing within acceptable limits. The antenna can be used in applications requiring adaptive beam direction. Limitations of the technique to control the beam direction are also addressed.
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