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The length and the width of the reflector are l sub y and l sub x respectively. The pattern of the beam in the azimuth plane corresponding to its long dimension is narrow, and in the elevation plane, the pattern corresponding to its narrow dimension is wider. The beam width along the y z-plane labeled, beta sub y z approximately equals to start fraction lambda over l sub x end fraction. The beam width along the x z-plane labeled, beta sub y z approximately equals to start fraction lambda over l sub y end fraction.