期刊
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
卷 59, 期 12, 页码 4542-4552出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2011.2165515
关键词
Frequency selective surfaces; lens antennas; lenses; periodic structures
资金
- Air Force Office of Scientific Research [FA9550-11-1-0050]
- National Science Foundation [ECCS-1101146, ECCS-1052628]
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1052628] Funding Source: National Science Foundation
We present a new technique for designing low-profile planar microwave lenses. The proposed lenses consist of numerous miniature spatial phase shifters distributed over a planar surface. The topology of each spatial phase shifter (SPS) is based on the design of a class of bandpass frequency selective surfaces composed entirely of sub-wavelength, non-resonant periodic structures. A procedure for designing the proposed lenses and their constituting spatial phase shifters is also presented in the paper. This design procedure is applied to two different planar lenses operating at X-band. Each lens is a low-profile structure with an overall thickness of 0.08 lambda(0) and uses sub-wavelength SPSs with dimensions of 0.2 lambda(0) X 0.2 lambda(0), where lambda(0) is the free-space wavelength at 10 GHz. These prototypes are fabricated and experimentally characterized using a free-space measurement system and the results are reported in the paper. The fabricated prototypes demonstrate relatively wide bandwidths of approximately 20%. Furthermore, the lenses demonstrate stable responses when illuminated under oblique angles of incidence. This feature is of practical importance if these lenses are to be used in beam-scanning antenna applications.
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