Abstract
In this paper, the design and performance analysis of an Inkjet-printed metamaterial loaded monopole antenna is presented for wireless local area network (WLAN) and worldwide interoperability for microwave access (WiMAX) applications. The proposed metamaterial structure consists of two layers, one is rectangular tuning fork-shaped antenna, and another layer is an inkjet-printed metamaterial superstate. The metamaterial layer is designed using four split-ring resonators (SRR) with an H-shaped inner structure to achieve negative-index metamaterial properties. The metamaterial structure is fabricated on low-cost photo paper substrate material using a conductive ink-based inkjet printing technique, which achieved dual negative refractive index bands of 2.25–4.25 GHz and 4.3–4.6 GHz. The antenna is designed using a rectangular tuning fork structure to operate at WLAN and WiMAX bands. The antenna is printed on 30 × 39 × 1.27 mm3 Rogers RO3010 substrate, which shows wide impedance bandwidth of 0.75 GHz (2.2 to 2.95 GHz) with 2 dB realized gain at 2.4 GHz. After integrating metamaterial structure, the impedance bandwidth becomes 1.25 GHz (2.33 to 3.58 GHz) with 2.6 dB realized gain at 2.4 GHz. The antenna bandwidth and gain have been increased using developed quad SRR based metasurface by 500 MHz and 0.6 dBi respectively. Moreover, the proposed quad SRR loaded antenna can be used for 2.4 GHz WLAN bands and 2.5 GHz WiMAX applications. The contribution of this work is to develop a cost-effective inject printed metamaterial to enhance the impedance bandwidth and realized the gain of a WLAN/WiMAX antenna.
Highlights
The development of modern wireless communication systems requires multi-band antennas for wireless service requirements
Numerical results show that, compared to the patch antenna, the realized gain of the proposed antenna gets improved by more than 0.6 dBi within the working band and the impedance bandwidth is increased from 0.61 GHz (2.38–2.99 GHz) to 1.25 GHz (2.33–3.58 GHz)
The antenna developed in this paper dominates the smaller area and has simpler geometry to realize the required operating bands compared to other designs stated in the literature
Summary
The development of modern wireless communication systems requires multi-band antennas for wireless service requirements. Many studies on multiband antennas for wireless communication systems have been reported by using conventional methods such as a monopole antenna [4,5], dipole antenna [6], slot antennas [7,8], the co-planar antenna [9] and fractal antenna [10] Though, they still have a large size corresponding to the wavelength at their operating frequencies and small bandwidth with low gain. Numerical results show that, compared to the patch antenna, the realized gain of the proposed antenna gets improved by more than 0.6 dBi within the working band and the impedance bandwidth is increased from 0.61 GHz (2.38–2.99 GHz) to 1.25 GHz (2.33–3.58 GHz). The antenna developed in this paper dominates the smaller area and has simpler geometry to realize the required operating bands compared to other designs stated in the literature
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