| 摘要 |
An antenna device using an approximate Luneberg lens, wherein high gain and low side-lobe are made compatible. A lens antenna device comprising, combine with each other, a radio wave lens ( 1 ) formed of a dielectric satisfying the condition, 0<a<=r, where the distance from the front surface of a lens ( 4 ) to the focal point of the lens is a, and the radius of the lens r, and a primary radiator ( 2 ) having a 10-dB beam width theta wherein A, determined by the expression, A=theta/2x(1+2a/r), is at least 40 and up to 80, more preferably at least 50 and up to 70.
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