1. Dual-Polarized $L$ -Band and Single-Polarized $X$ -Band Shared-Aperture SAR Array.
- Author
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Chen, Ying and Vaughan, Rodney G.
- Subjects
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POLARIZATION of radio waves , *SYNTHETIC aperture radar , *RADIO frequency , *ANTENNA arrays , *SLOT antennas , *WAVEGUIDE antenna arrays - Abstract
New designs of slot elements and a new configuration for array antennas for synthetic aperture radar (SAR) at L- and X-bands are presented. The L-band elements are cavity-backed crossed slots for dual polarization, and for X-band, interleaved ridged waveguide slot subarrays are used. The height of the L-band cavity is reduced by adopting an inverted-T configuration. Each of the crossed slots is fed by a pair of differential probes to ensure the correct modal excitation with high isolation. For evaluation, the X-band slot subarray is center fed by a coax probe although slot excitation is also possible. An initial prototype array comprising $4 \times 3$ L-band elements interleaved with X-band subarrays was fabricated to allow initial measurements. This element design is applicable for larger arrays and can be readily configured to frequency ratios other than L- and X-bands. A construction advantage of the slot design over SAR patch arrays is the use of all-metallic surfaces. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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