A novel small planar antenna utilizing cascaded right/left-handed transmission lines

In recent years, meta-material is very popular and widely applied to microwave circuits, including antennas. Antennas associated with left handed material are expected to provide superior characteristics, especially the miniaturized size. Amount of antennas employing CRLH structure were researched. Small planar antennas utilizing the ZOR mode were published in Sanada, A., et al (2004). The physical size of such antenna can be arbitrary regardless the operation frequency since it is specified by the value of the capacitances and inductances instead of the wavelength. Unlike employing CRLH or simply LH TL, a novel planar antenna utilizing cascaded right/left-handed transmission lines is proposed in this paper. A new concept of achieving resonance which is also regardless of the wavelength of the operation frequency is developed without using CRLH structure. The equivalent transmission line circuits are used to analysis and design the antenna.