| 摘要 |
PURPOSE:To perform the suppression of a side lope and that of cross polarization and to improve radial directivity, by constituting a primary radiator of plural antenna devices, and setting the excitation distribution of the plural antenna devices by a prescribed equation. CONSTITUTION:A feeder part which excites the plural antenna elements 1-9 consisting of the primary radiator so as to satisfy almost an excitation weight Wn decided by an excitation weight vector W is provided. In such a case, on the horns 1-9 which become the antenna elements, the excitation weights W1-W9 are applied by a weight apparatus respectively, and waves inputted to each horn, after weight being applied on it, are synthesized by a synthesizer 10. And when the excitation weight to minimize an output power Pout is found, only the component of a desired wave remains in the output power, and an interfering wave component is negated, then, the excitation weight W to minimize the Pout can be obtained analytically. In such a way, it is possible to synthesize directivity with low side lope and low cross polarization at a prescribed angle area.
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