Mu-near-zero metasurface for microstrip-fed slot antennas |
| |
| Authors: | Sarawuth Chaimool Chawalit Rakluea Prayoot Akkaraekthalin |
| |
| Institution: | 1. Wireless Communication Research Group (WCRG), Electrical and Computer Engineering, Faculty of Engineering, King Mongkut’s University of Technology North Bangkok, Bangkok, Thailand
2. Department of Electronic and Telecommunication, Faculty of Engineering, Rajamangala University of Technology Thanyaburi, Bangkok, Thailand
|
| |
| Abstract: | A mu-near-zero metasurface as a superstrate consisting of a periodically square closed ring is proposed for gain and bandwidth enhancement of microstrip-fed slot antennas (MFSAs). The metasurface exhibits near-zero permeability (0<μ<1) and negative reflection phase. For a unidirectional radiation pattern, the metasurface above the MFSA is employed to reduce the back-lobe radiation (180°) and enhance the gain at 0° without a metallic reflector. Interestingly, if additional metasurfaces are placed on both sides of the MFSA, a low-profile, high-gain and wide-band bidirectional antenna can be obtained. The results indicate that the metasurface can also enhance the radiation characteristics, impedance bandwidth and efficiency. Both simulation and measurement of the proposed antennas with metasurface show a fractional bandwidth of 25 % and the overall thicknesses of λ 0/12 and λ 0/6 of uni- and bidirectional antennas, respectively. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
