Title :
Nonreciprocal CRLH metamaterials and their applications to beam-scanning antennas
Author :
Ueda, Toshitsugu ; Itoh, Takayuki
Author_Institution :
Dept. of Electron., Kyoto Inst. of Technol., Kyoto, Japan
Abstract :
This paper reviews recent progress on nonreciprocal CRLH metamaterials with nonreciprocal phase constants and their applications to beam-scanning antennas. The nonreciprocal CRLH metamaterials show positive and negative refractive indices at the same frequency, selection of which depends on directions of the transmitted power. Traveling wave resonators with variable size and phase gradient of the field profile can be designed for a given frequency. In addition, beam-scanning antenna with the externally applied dc magnetic field is demonstrated based on the resonator showing high radiation efficiency and small beam squint, compared to conventional leaky wave antennas.
Keywords :
antenna radiation patterns; electromagnetic metamaterials; leaky wave antennas; refractive index; resonators; antenna radiation efficiency; beam-scanning antenna application; composite right-left handed metamaterial; externally applied DC magnetic field; leaky wave antenna; negative refractive index; nonreciprocal CRLH metamaterial; nonreciprocal phase constant; positive refractive index; small beam squint; traveling wave resonator; Dispersion; Magnetic materials; Metamaterials; Microwave antennas; Optical resonators; Power transmission lines; Metamaterials; beam-scanning antennas; composite right/left handed transmission lines; nonreciprocal devices; periodic structures;
Conference_Titel :
Microwave Conference Proceedings (APMC), 2013 Asia-Pacific
Conference_Location :
Seoul
DOI :
10.1109/APMC.2013.6695181
