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Slow wave‐modified low profile planar spiral antenna on EBG
Author(s) -
B. A Sapna,
Rao Patnam Hanumantha
Publication year - 2009
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.24303
Subject(s) - spiral antenna , spiral (railway) , antenna (radio) , optics , planar , radiation pattern , perfect conductor , microwave , return loss , physics , wideband , engineering , acoustics , electrical engineering , coaxial antenna , telecommunications , computer science , mechanical engineering , computer graphics (images) , scattering
A two arm Archimedean spiral antenna is modified to form various slow wave structures that have much lower operating frequency than the conventional spirals, making them compact elements for wideband array applications. Uni‐directional patterns are obtained from a slow wave modified circular star spiral with electromagnetic band gap (EBG) structure. Measured return loss of circular star spiral at 2 GHz backed by perfect electric conductor at λ/4 is −16.37 dB and this is improved to −20.25 dB when the antenna is placed over an EBG at a separation of λ/10. The radiation pattern of antenna on EBG provides a back lobe suppression of 30 dB over an isolated planar modified spiral antenna. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1270–1274, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24303