Series Dual-Fed Continuous Transverse Stub Array Enabled by a Reflective Luneburg Lens with Enhanced Multi-Beam Operation
This paper introduces an all-metal series dual-fed continuous transverse stub (CTS) array that enables multi-beam operation at K-band. This capability is obtained by utilizing a reflecting Luneburg lens (RLL) beamformer made of two stacked circular parallel plate waveguides (PPWs). The bottom PPW ho...
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Published in | IEEE transactions on antennas and propagation p. 1 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
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IEEE
2024
Institute of Electrical and Electronics Engineers |
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Abstract | This paper introduces an all-metal series dual-fed continuous transverse stub (CTS) array that enables multi-beam operation at K-band. This capability is obtained by utilizing a reflecting Luneburg lens (RLL) beamformer made of two stacked circular parallel plate waveguides (PPWs). The bottom PPW hosts a graded index medium that collimates the rays coupled by a corner reflector to the top PPW, where the CTS array is located. This design capitalizes on the RLL's rotational symmetry, employing a circular array of feeds to generate multiple planar wavefronts that illuminate the CTS array across a 360° range. Consequently, a new series-fed CTS array has been introduced to ensure high aperture efficiency when excited from diametrically opposed ends. The appropriate selection of the feeds, combined with the rotation of the CTS plane, enables the generation of simultaneous independent beams with continuous scanning. This architecture enhances the capabilities of conventional variable inclination CTS arrays. A prototype has been fabricated and tested, demonstrating excellent performance between 17.3 and 21.2 GHz, with an aperture efficiency of 43.5-58% and a radiation efficiency of 90%. The antenna achieves scanning up to 55° in azimuth and from 5° to 65° in elevation through port switching, and full-azimuthal coverage with the added mechanical rotation. This design is particularly significant for K-band low-earth orbit (LEO) high-throughput satellite communications. |
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AbstractList | This paper introduces an all-metal series dual-fed continuous transverse stub (CTS) array that enables multi-beam operation at K-band. This capability is obtained by utilizing a reflecting Luneburg lens (RLL) beamformer made of two stacked circular parallel plate waveguides (PPWs). The bottom PPW hosts a graded index medium that collimates the rays coupled by a corner reflector to the top PPW, where the CTS array is located. This design capitalizes on the RLL's rotational symmetry, employing a circular array of feeds to generate multiple planar wavefronts that illuminate the CTS array across a 360° range. Consequently, a new series-fed CTS array has been introduced to ensure high aperture efficiency when excited from diametrically opposed ends. The appropriate selection of the feeds, combined with the rotation of the CTS plane, enables the generation of simultaneous independent beams with continuous scanning. This architecture enhances the capabilities of conventional variable inclination CTS arrays. A prototype has been fabricated and tested, demonstrating excellent performance between 17.3 and 21.2 GHz, with an aperture efficiency of 43.5-58% and a radiation efficiency of 90%. The antenna achieves scanning up to 55° in azimuth and from 5° to 65° in elevation through port switching, and full-azimuthal coverage with the added mechanical rotation. This design is particularly significant for K-band low-earth orbit (LEO) high-throughput satellite communications. |
Author | Sauleau, Ronan Bilitos, Christos Morvan, Xavier Martini, Enrica Maci, Stefano Gonzalez-Ovejero, David |
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Keywords | Slot antennas K-band Lattices Reflector antennas Broadband antennas Antenna arrays Lenses |
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Snippet | This paper introduces an all-metal series dual-fed continuous transverse stub (CTS) array that enables multi-beam operation at K-band. This capability is... |
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SubjectTerms | Antenna arrays beam-scanning broadband antenna Broadband antennas continuous transverse stub array Engineering Sciences K-band Lattices Lenses metalens multi-beam antenna reflecting Luneburg lens Reflector antennas satellite communications Slot antennas |
Title | Series Dual-Fed Continuous Transverse Stub Array Enabled by a Reflective Luneburg Lens with Enhanced Multi-Beam Operation |
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