Wide-Angle Beam-Steering and Adaptive Impedance Matching With Reconfigurable Nonlocal Leaky-Wave Antenna
We present a simple reconfigurable leaky-wave antenna (LWA) capable of fixed-frequency continuous beam-scanning, along with an efficient optimization procedure with which its radiation pattern can be shaped. To construct the LWA, an array of varactor-loaded unit-cells are connected in series over a...
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| Format: | Article |
| Language: | English |
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IEEE
2022-01-01
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| Series: | IEEE Open Journal of Antennas and Propagation |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/9880483/ |
| _version_ | 1828329218838102016 |
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| author | Gengyu Xu George V. Eleftheriades Sean Victor Hum |
| author_facet | Gengyu Xu George V. Eleftheriades Sean Victor Hum |
| author_sort | Gengyu Xu |
| collection | DOAJ |
| description | We present a simple reconfigurable leaky-wave antenna (LWA) capable of fixed-frequency continuous beam-scanning, along with an efficient optimization procedure with which its radiation pattern can be shaped. To construct the LWA, an array of varactor-loaded unit-cells are connected in series over a grounded dielectric substrate, forming a reconfigurable leaky microstrip. The varactors are individually addressed, with a biasing scheme determined via optimization. To ensure the practicality of the converged solutions, several feasibility-based optimization constraints are derived. In contrast with conventional LWAs, the proposed device is synthesized based on an aperiodic non-local model which rigorously accounts for the mutual coupling between all radiating elements. As a result, it can be optimized to meet very demanding requirements, such as wide-angle continuous beam-scanning with strong side lobe suppression. Importantly, the antenna input impedance can be adaptively tuned to match that of the source, without the need for a complicated matching network. Furthermore, the optimization procedure can accommodate different end terminations, even when they cause strong backward reflections. These features of the proposed LWA are confirmed through numerical simulations. Measurements of a fabricated prototype working at 10 GHz demonstrated a 130° continuous scan range, and a peak gain of 8.9 dBi. |
| first_indexed | 2024-04-13T20:21:17Z |
| format | Article |
| id | doaj.art-915662edfc544a369006c82726452e90 |
| institution | Directory Open Access Journal |
| issn | 2637-6431 |
| language | English |
| last_indexed | 2024-04-13T20:21:17Z |
| publishDate | 2022-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Open Journal of Antennas and Propagation |
| spelling | doaj.art-915662edfc544a369006c82726452e902022-12-22T02:31:32ZengIEEEIEEE Open Journal of Antennas and Propagation2637-64312022-01-0131141115310.1109/OJAP.2022.32049279880483Wide-Angle Beam-Steering and Adaptive Impedance Matching With Reconfigurable Nonlocal Leaky-Wave AntennaGengyu Xu0https://orcid.org/0000-0003-0026-9627George V. Eleftheriades1https://orcid.org/0000-0001-7987-3864Sean Victor Hum2https://orcid.org/0000-0002-8797-0039The Edward S. Rogers Sr. Department of Electrical & Computer Engineering, University of Toronto, Toronto, ON, CanadaThe Edward S. Rogers Sr. Department of Electrical & Computer Engineering, University of Toronto, Toronto, ON, CanadaThe Edward S. Rogers Sr. Department of Electrical & Computer Engineering, University of Toronto, Toronto, ON, CanadaWe present a simple reconfigurable leaky-wave antenna (LWA) capable of fixed-frequency continuous beam-scanning, along with an efficient optimization procedure with which its radiation pattern can be shaped. To construct the LWA, an array of varactor-loaded unit-cells are connected in series over a grounded dielectric substrate, forming a reconfigurable leaky microstrip. The varactors are individually addressed, with a biasing scheme determined via optimization. To ensure the practicality of the converged solutions, several feasibility-based optimization constraints are derived. In contrast with conventional LWAs, the proposed device is synthesized based on an aperiodic non-local model which rigorously accounts for the mutual coupling between all radiating elements. As a result, it can be optimized to meet very demanding requirements, such as wide-angle continuous beam-scanning with strong side lobe suppression. Importantly, the antenna input impedance can be adaptively tuned to match that of the source, without the need for a complicated matching network. Furthermore, the optimization procedure can accommodate different end terminations, even when they cause strong backward reflections. These features of the proposed LWA are confirmed through numerical simulations. Measurements of a fabricated prototype working at 10 GHz demonstrated a 130° continuous scan range, and a peak gain of 8.9 dBi.https://ieeexplore.ieee.org/document/9880483/Beam steeringimpedance matchingleaky wave antennasmutual couplingoptimizationreconfigurable antennas |
| spellingShingle | Gengyu Xu George V. Eleftheriades Sean Victor Hum Wide-Angle Beam-Steering and Adaptive Impedance Matching With Reconfigurable Nonlocal Leaky-Wave Antenna IEEE Open Journal of Antennas and Propagation Beam steering impedance matching leaky wave antennas mutual coupling optimization reconfigurable antennas |
| title | Wide-Angle Beam-Steering and Adaptive Impedance Matching With Reconfigurable Nonlocal Leaky-Wave Antenna |
| title_full | Wide-Angle Beam-Steering and Adaptive Impedance Matching With Reconfigurable Nonlocal Leaky-Wave Antenna |
| title_fullStr | Wide-Angle Beam-Steering and Adaptive Impedance Matching With Reconfigurable Nonlocal Leaky-Wave Antenna |
| title_full_unstemmed | Wide-Angle Beam-Steering and Adaptive Impedance Matching With Reconfigurable Nonlocal Leaky-Wave Antenna |
| title_short | Wide-Angle Beam-Steering and Adaptive Impedance Matching With Reconfigurable Nonlocal Leaky-Wave Antenna |
| title_sort | wide angle beam steering and adaptive impedance matching with reconfigurable nonlocal leaky wave antenna |
| topic | Beam steering impedance matching leaky wave antennas mutual coupling optimization reconfigurable antennas |
| url | https://ieeexplore.ieee.org/document/9880483/ |
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