期刊
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
卷 61, 期 3, 页码 1166-1179出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2012.2227444
关键词
Frequency selective surfaces (FSSs); lenses; periodic structures; phased arrays
资金
- Air Force Office of Scientific Research under AFOSR Award [FA9550-11-1-0050]
- National Science Foundation under NSF Award [ECCS-1101146]
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1101146] Funding Source: National Science Foundation
We present a new technique for designing low-profile, ultrawideband, true-time-delay (TTD) equivalent microwave lenses. Such a lens is composed of numerous spatial time-delay units (TDUs) distributed over a planar surface. Each spatial TDU is the unit cell of an appropriately designed miniaturized-element frequency selective surface and provides a frequency-independent time delay within the frequency band of interest. Two TTD lens prototypes with focal length to aperture dimension (f/D) ratios of 1 and 1.6 are designed, fabricated, and experimentally characterized at X-band. The 3-dB gain bandwidths of these lenses are respectively 7.5-11.6 and 7.8-11.5 GHz. Each fabricated lens has an overall thickness of 4.76 mm, which corresponds to similar to 0.150 lambda(0), where lambda(0) is the free-space wavelength at the center frequency of operation. Each lens uses spatial TDUs with physical dimensions of 6 x 6 mm(2), or similar to 0.19 lambda(0) x 0.19 lambda(0.) Both lenses have a system fidelity factor close to 1, when excited with a broadband pulse. Furthermore, due to their true-time-delay equivalent behavior, the fabricated lenses do not suffer from chromatic aberration within their operational bands. When used in a beam-scanning antenna system, each lens demonstrates an excellent scanning performance in a field of view of +/- 60 degrees.
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