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Experimental demonstration of the origin of photonic bandgap creation and associated defect modes in microwave planar circuits
Author(s) -
Saib A.,
Platteborze R.,
Huynen I.
Publication year - 2004
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.20028
Subject(s) - planar , microwave , microstrip , band gap , photonic crystal , materials science , dielectric , transmission line , photonic bandgap , electrical impedance , characteristic impedance , optoelectronics , optics , refractive index , photonics , physics , electrical engineering , telecommunications , engineering , computer science , computer graphics (images)
This paper presents an experimental demonstration of the origin of the Photonic bandgap, using a planar dielectric substrate with a 1D finite array of rectangular holes. A microstrip of uniform width placed above the array shows a periodic variation of impedance and refractive index. The measured transmission factor of the line exhibits a strong bandgap. When the width of the microstrip periodically changes in order to keep a constant impedance along the array, the bandgap in the measured transmission totally disappears. This proves that the creation of bandgap is due to the periodic variation of impedances instead of refractive indexes. The effect of the presence of defects is also illustrated. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 41: 5–9, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20028