Abstract
The Luneburg lens antenna is a promising candidate for multibeam antennas. However, the Luneburg lens often suffer from the bulky size which limits their applications in practical wireless communication systems. Meanwhile Luneburg lens with compact size usually can only provide a relatively narrow scanning range. To deal with these problems, a new approach to achieve a compact size and wide scanning range simultaneously is proposed. This paper presents a compact cylinder Luneburg lens antenna with diameter of 29 mm, achieving a wide scanning range of ±90°. The lens is formed by 10 layers of dielectric cylindrical rings with air gaps, and the rectangular waveguide is chosen as the feed antenna. Simulated results show that the Luneburg lens antenna can operate over the whole Ka-band with the gain of 14.5-17 dBi. Besides, by arranging several feed antennas, a wide scanning range of ±90° can be attained.
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