期刊
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
卷 11, 期 2, 页码 205-217出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TTHZ.2020.3038033
关键词
Lenses; Phased arrays; Feeds; Apertures; Gratings; Antenna arrays; Bandwidth; Beam-scanning; leaky-wave feed; lens antenna array; lens-phased array; submillimeter-wave
资金
- ERC Starting Grant LAA-THz-CC [639749]
This study proposes a hybrid electromechanical scanning lens antenna array architecture for steering highly directive beams at submillimeter wavelengths, combining electronic phase shifting of a sparse array with mechanical translation of a lens array. Additionally, a novel leaky wave lens feed concept is implemented for achieving wide bandwidth and large steering angles in the antenna system.
In this article, we propose a hybrid electromechanical scanning lens antenna array architecture suitable for the steering of highly directive beams at submillimeter wavelengths with field-of-views (FoV) of +/- 25 degrees. The concept relies on combining electronic phase shifting of a sparse array with a mechanical translation of a lens array. The use of a sparse-phased array significantly simplifies the RF front-end (number of active components, routing, thermal problems), while the translation of a lens array steers the element patterns to angles off-broadside, reducing the impact of grating lobes over a wide FoV. The mechanical translation required for the lens array is also significantly reduced compared to a single large lens, leading to faster and low-power mechanical implementation. In order to achieve wide bandwidth and large steering angles, a novel leaky wave lens feed concept is also implemented. A 550-GHz prototype was fabricated and measured demonstrating the scanning capabilities of the embedded element pattern and the radiation performance of the leaky wave fed antenna.
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