DocumentCode :
1200993
Title :
A New Technique for Design of Low-Profile, Second-Order, Bandpass Frequency Selective Surfaces
Author :
Al-Joumayly, Mudar ; Behdad, Nader
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Univ. of Central Florida, Orlando, FL
Volume :
57
Issue :
2
fYear :
2009
Firstpage :
452
Lastpage :
459
Abstract :
In this study, a new method for designing low profile frequency selective surfaces (FSS) with second-order bandpass responses is presented. The FSSs designed using this technique utilize non-resonant subwavelength constituting unit cells with unit cell dimensions and periodicities in the order of 0.15lambda0. It is demonstrated that using the proposed technique, second-order FSSs with an overall thickness of lambda0/30 can be designed. This is considerably smaller than the thickness of second-order FSSs designed using traditional techniques and could be particularly useful at lower frequencies with long wavelengths. To facilitate the design of this structure, an equivalent circuit based synthesis method is also presented in this paper. Two bandpass FSS prototypes operating at X-band are designed, fabricated, and tested. A free space measurement setup is used to thoroughly characterize the frequency responses of these prototypes for both the TE and TM polarizations and various angles of incidence. The frequency responses of these structures are shown to have a relatively low sensitivity to the angle of incidence. Principles of operation, detailed design and synthesis procedure, and measurement results of two fabricated prototypes are presented and discussed in this paper.
Keywords :
band-pass filters; electromagnetic wave polarisation; equivalent circuits; frequency selective surfaces; microwave filters; network synthesis; network topology; resonator filters; TE polarization; TM polarization; equivalent circuit-based-synthesis method; free space measurement; frequency selective surface; nonresonant subwavelength; resonator filter topology; second-order bandpass response; Band pass filters; Design methodology; Dielectrics; Equivalent circuits; Frequency selective surfaces; Microwave antennas; Microwave filters; Periodic structures; Prototypes; Radar antennas; Antenna arrays; frequency selective surfaces (FSSs); periodic structures; radomes; spatial filters;
fLanguage :
English
Journal_Title :
Antennas and Propagation, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-926X
Type :
jour
DOI :
10.1109/TAP.2008.2011382
Filename :
4804093
Link To Document :
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