期刊名称：International Journal of Soft Computing & Engineering
电子版ISSN：2231-2307
出版年度：2012
卷号：2
期号：5
页码：218-220
出版社：International Journal of Soft Computing & Engineering
摘要：In this article, the variations of changing the number of rings, diameter and patch material are studied for circular ring-shape planar antenna and explore the possibility of converting a single band antenna to multiband. While doing so retain the compactness of multiband antenna. Such type of planar structure has wide potential with multiband support which is to be sight for different aerospace and telecommunication applications. A circular conductor is placed centered in the narrow annular ring having inner radius (Ri) and outer radius (Ro). These patterns are printed on polytetraflouroethlene (PTFE) substrate having dielectric constant 4.4, a thickness of 1.59mm, and a loss tangent of 0.020. The design laminate antenna structure consists of, a ring-shape radiating conducting material and a 50 ohm matching coaxial type feed line which work well for common resonating frequency 7.5 GHz bands. In single band the return loss value is -12.96dB and in case of dual ring the return loss value is -20.32dB at 7.5 GHz. The other band achieved in two ring is 6.5 GHz having return loss value is -21.45dB.
关键词：Single to multiband; RF device; Microstrip;antenna; Ring-shape; PTFE.
