Scanning-Beam Antenna on Metamaterials Coplanar Structure for Wireless Applications

Hamdi, Abdelaziz; Samet, Abdelaziz
June 2011
Journal of Digital Information Management;Jun2011, Vol. 9 Issue 3, p111
Academic Journal
A scanning-beam antenna on metamaterial coplanar structures is presented. The proposed antenna is, in essence, a composite of Right/Left-Handed (CRLH) coplanar waveguide (CPW) structure incorporating distributed periodic structures with L-C high-pass filter topology which support left-handed (LH) waves. The negative refractive index (NRI) properties of these structures are shown theoretically, numerically and validated by full-wave simulations. The supported LH wave is fully characterized and based on the composite right/left-handed transmission-line (CRLH-TL) theory; and the dispersion characteristics, refractive indexes and Bloch impedance are derived theoretically. In addition, formulas to extract equivalent-circuit parameters from full-wave simulation are given. Since the distance d between adjacent cells of the array is small, d << λ0 and the of array becomes a uniform leaky-wave antenna (LWA) for a 10-cell operating near 10 GHz. Simulated radiation pattern, gain, and associated loss budget are presented. The results of LWA exhibit scanning-beam capability from backfire-to-end fire direction and accord well with the theoretical analysis. The antenna is printed on thin and flexible substrate (h = 25µm). Furthermore, since the antenna is implemented with low-cost and CPW technology, it is a good candidate for integrated RF/microwave systems that can be used in digital wireless communications and radars.


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