A Metamaterial Inspired ZOR Antenna Using IDC and Spiral Inductor with Partial Ground Plane for WLAN Application
- 39 Downloads
In this article, an open-ended metamaterial antenna structure is designed for WLAN application. The antenna comprises of an interdigital capacitor (IDC) and spiral inductor with a partial ground plane. The IDC (shunt element) act as a varying parameter to control the zeroth-order resonance (ZOR) frequency, whereas spiral inductor (series element) is used to form a first negative order resonance frequency at 2.29 GHz. The ZOR mode has been excited at 4.53 GHz by employing complimentary right/left handed transmission line model in the structure and the first positive order resonance (FPOR) frequency is obtained at 4.9 GHz. A rectangular shaped stub has been used to act as a virtual ground for IDC. The proposed antenna design has total foot-print size of 0.29λ0 × 0.27λ0 × 0.024λ0. The fractional bandwidth of 20.41% (4.36–5.35 GHz) is achieved due to the merging of ZOR and FPOR mode respectively. In addition, it also exhibits a measured peak gain of 2.12 dB and 2 dB with a radiation efficiency of 77.76% and 87.62% at ZOR and FPOR frequencies respectively. A prototype of the proposed antenna structure has been fabricated and simulation results are experimentally rectified. A good agreement between simulation and measured results are obtained.
KeywordsMetamaterial antenna Inter-digital capacitor Spiral inductor Zeroth order resonance
This research work is supported by Science and Engineering Research Board (SERB), DST, GoI, India under Project No. EEQ/2016/000023.
- 5.Caloz, C., & Itoh, T. (2006). Electromagnetic metamaterials: Transmission line approach and microwave applications. NewYork: Wiley.Google Scholar
- 6.Choudhary, D. K., & Chaudhary, R. K. (2017). A compact coplanar waveguide (CPW)-fed zeroth-order resonant filter for bandpass applications. Frequenz Journal of RF-Engineering and Telecommunications, De Gruyter, 71, 305–310.Google Scholar
- 18.Xu, H. X., Wang, G. M., Qi, M. Q., Zhang, C. X., Liang, J. G., Gong, J. Q., et al. (2013). Analysis and design of two-dimensional resonant-type composite right left handed transmission lines with compact gain-enhanced resonant antennas. IEEE Transactions on Antennas and Propagation, 61, 735–747.CrossRefGoogle Scholar
- 24.Sanada, A., Kimura, M., Awai, I., Caloz, C., & Itoh, T. (2004). A planar zeroth order resonator antenna using left-handed transmission line. In 34th IEEE European microwave conference (pp. 1341–1344).Google Scholar