期刊
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
卷 60, 期 6, 页码 2645-2653出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2012.2194674
关键词
Bessel beams; diffraction-free beams; leaky-wave modes; no diffractive waves
资金
- U.S. Air Force through UES Inc. [FA8650-090-D-5037, FA9550-09-1-0696]
- Center for Photonics and Multiscale Nanomaterials (C-PHOM)
- University of Rennes 1, Rennes, France
We present the experimental generation of Bessel beams using a leaky radial waveguide. The radial waveguide consists of a capacitive sheet over a ground plane. The capacitive sheet is composed of patch elements printed on both sides of a dielectric substrate. The radial waveguide is coaxially fed and supports an azimuthally invariant leaky-wave mode whose normal electric-field component is a truncated, zeroth-order Bessel function. Two prototypes are presented with the same propagation constant and lateral extent, but different attenuation constants. 2D electric field measurements and their respective Fourier transforms validate the operation of the prototypes as Bessel-beam launchers at two frequency bands. Cleaner patterns are achieved by the prototype with lower attenuation constant. The dual-band capability and associated frequency dependent resolution can be useful in near-field planar focusing systems. The proposed structure can be used for generating arbitrary zeroth-order propagating Bessel beams at microwave and millimeter-wave frequencies.
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