EFFICIENCY IMPROVEMENT FOR QUARTER-WAVELENGTH GROUND-PLANE MONOPOLE ANTENNA BY USING COAXIAL-LOOP WIRE MEDIUM (CLWM)
Keywords:
Gain improvement, wire medium, monopole antenna, omnidirectional pattern, metamaterialsAbstract
The Narrow Band Internet of Thing (NB-IoT) system needs the high-gain omnidirectional antenna since it can efficiently transceiver the signal to/from IoT devices that surrounded itself. Therefore, this paper presents the method for increasing the gain of primary quarter-wavelength monopole antenna using the structure technique of metamaterial, which yields the exact omnidirectional pattern as we required. The metamaterial structure, which we so-called coaxial-loop wire medium (CLWM), consists of a monopole antenna surrounded by multi-turn of small conducting wire loops, surrounded by an air layer and surrounded by multi-turn of larger conducting wire loops. Therefore, the term coaxial loop comes from the inner and outer wire loops sharing a geometric axis. The proposed CLWM was verified that be metamaterial by using the simulated results (S11 and S21) from CST software and then compared to the measured results. After that, the permeability, permittivity, and refraction index near zero are calculated by using Nicholson-Ross-Weir (NRW) method, respectively. Finally, we found that the CLWM operates with a monopole antenna can provide the omnidirectional pattern on the azimuthal plane, whereas, in the elevation pattern, its beam width is reduced, causing the realized gain of the conventional monopole is increased around 3.43 dB.
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