| 1. |
- Gil-Martinez, Alejandro, et al.
(författare)
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Symmetric Tapering of Bi-Directionally Fed Leaky-Wave Antennas for Multi-Beam Synthesis
- 2023
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Ingår i: 2023 17TH EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION, EUCAP. - : Institute of Electrical and Electronics Engineers (IEEE).
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Konferensbidrag (refereegranskat)abstract
- We report a theoretical investigation on the possibilities and trade-offs when tapering a bi-directional fed leaky-wave antenna (LWA) to reduce the side lobes level, when operating with the two opposite antenna ports. It is demonstrated that, for high radiation efficiency designs, the directivity can be distorted due to low aperture illumination efficiency if the LWA is not symmetrically tapered with an adequate modulation function. The theory is corroborated with simulations of modulated LWAs in substrate integrated technology.
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| 2. |
- Wang, Lei, et al.
(författare)
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Dispersion Reduced SIW Leaky-wave Antenna by Loading Metasurface Prism
- 2018
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Ingår i: 2018 IEEE International Workshop on Antenna Technology, iWAT2018 - Proceedings. - : Institute of Electrical and Electronics Engineers (IEEE). - 9781538618516
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Konferensbidrag (refereegranskat)abstract
- Leaky-wave antennas (LWAs) are well-known for the high directivity, wide impedance bandwidth, and the beam-scanning performance with frequency. However, in the system that requires high-speed data transfer, wide system band and high directivity, LWAs are struggling with their beam squint effect in the radiation patterns, which limits their applications. In this paper, a dispersive metasurface prism is loaded to a dispersive LWA, reducing the LWA's dispersion, to make the LWA wide band radiating at a specific direction. A substrate integrated waveguide (SIW) LWA is taken to demonstrate the proposed concept with metasurface prism implemented by metallic vias. Full-wave simulation results show that the proposed low-dispersive SIW LWA has the main radiating direction at phi=24 degrees, with half-power beamwidth of 8 degrees, steers only +/- 0.5 degrees from 33 to 38 GHz.
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| 3. |
- Wang, Lei, et al.
(författare)
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Low-Dispersive Leaky-Wave Antenna Integrated in Groove Gap Waveguide Technology
- 2018
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Ingår i: IEEE Transactions on Antennas and Propagation. - : IEEE. - 0018-926X .- 1558-2221. ; 66:11, s. 5727-5736
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Tidskriftsartikel (refereegranskat)abstract
- In this paper, the use of a dispersive prism with a triangular shape is proposed to reduce the dispersive radiation nature of a leaky-wave antenna (LWA) in groove-gap waveguide technology. The operation of gap waveguide technology is based on the use of metallic pins that act as an artificial magnetic conductor, so the electromagnetic fields are confined and guided in the desired directions. To control a leaky-wave radiation of these confined fields is possible by tailoring the height of the pins, its periodicity, and the waveguide width. This radiation, as in any conventional LWA, is dispersive, leading to beam squint as the frequency is varied. Here, we mitigate this beam squint by using a prism made of dispersive pins and choosing appropriately their periodicity and height. With this prism, the leaky-wave radiation is focused into one single direction in a wide frequency band. This concept is demonstrated with a prototype designed to radiate at phi = 41 degrees with a central frequency of 12 GHz and the high gain of 16.5 dBi. A 22% frequency bandwidth for the 3 dB realized gain at phi = 41 degrees is achieved, and the main radiating direction, with half-power beamwidth of 5 degrees, steers only +/- 0.5 degrees from 11.4 to 13.4 GHz.
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| 4. |
- Wang, Lei, et al.
(författare)
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Substrate Integrated Waveguide Leaky-Wave Antenna With Wide Bandwidth via Prism Coupling
- 2018
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Ingår i: IEEE transactions on microwave theory and techniques. - : IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC. - 0018-9480 .- 1557-9670. ; 66:6, s. 3110-3118
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Tidskriftsartikel (refereegranskat)abstract
- New communications systems require high-speed data transfer and need high frequency, wideband, and directive antennas. Leaky-wave antennas are a desirable type of antennas for millimeter and submillimeter waves, since they can produce a high directive radiation with a single feeding. The latter is an enormous advantage to reducing the cost and losses at high frequency. Despite these advantages, their dispersive nature inherently produces a beam squint effect in their radiation patterns. Here, we propose the use of a lens that compensates for the dispersion of the leaky wave, making the overall antenna broadband. This concept is demonstrated in substrate integrated waveguide technology at Ka-band, and the lens is integrated in the same technology. Full-wave simulations and experimental results are presented to demonstrate the potential of our proposal. Our manufactured prototype has more than 20% frequency bandwidth for the 3-dB pattern at (sic) = 31 degrees, and the main radiating direction steers only +/- 0.5 degrees from 35 to 40 GHz with a half-power beamwidth of 8 degrees.
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