期刊
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
卷 69, 期 8, 页码 5060-5065出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2020.3048508
关键词
Lenses; Feeds; Antennas; Refractive index; Gain; Antenna feeds; Impedance; Lens antennas; Luneburg lens; multibeam antennas; wide scan angle
资金
- National Science Foundation under NSF [ECCS-1642601]
This study presents a cylindrical, multibeam, modified Luneburg lens antenna design with features such as low-profile, good impedance match, high gain, and wide angle scanning capability. By tapering the thickness of a dielectric disk along its radius, the required refractive index profile of the lens is achieved in a nondispersive manner. The use of the same dielectric material for the lens and the interior of the waveguide feeds enables a smooth impedance transition and ensures invariant azimuthal scanning.
We present a cylindrical, multibeam, modified Luneburg lens antenna. The proposed antenna features low-profile, good impedance match, high gain, and wide angle scanning capability. We tapered the thickness of a dielectric disk along its radius to achieve the required refractive index profile of the lens in a nondispersive fashion. Seventeen dielectric-filled waveguide feeds, arranged circumferentially around the focal arc of the lens, provide almost invariant azimuthal scanning in the range of +/- 60 degrees from broadside direction. The lens and the interior of the waveguide feeds are made of the same dielectric material, offering a smooth impedance transition from the feed antenna to the lens. A prototype of the antenna was fabricated and characterized. Measured reflection coefficient is better than -10 dB from 14 to 16 GHz. The isolations between feeds remain higher than 24 dB over the entire operational frequency range. We measured a maximum antenna gain of 20.5 dB with only 1.5 dB gain loss near the maximum 60 degrees scanning angle. The proposed high-gain, multibeam antenna design can be used in a wide range of applications including automotive and surveillance radars.
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