Double-E-Triple-H-Shaped NRI-Metamaterial for Dual-Band Microwave Sensing Applications

This paper presents a new Double-E-Triple-H-Shaped NRI(negative refractive index)metamaterial(MM)for dual-band microwave sensing applications.Here,a horizontal H-shaped metal structure is enclosed by two face-to-face E-shaped metal structures.This double-E-H-shaped design is also encased by two vertical H-shaped structures along with some copper links.Thus,the Double-E-Triple-H-Shaped configuration is developed.Two popular substrate materials of Rogers RO 3010 and FR-4 were adopted for analyzing the characteristics of the unit cell.The proposed structure exhibits transmission resonance inside the S-band with NRI and ENG(Epsilon Negative)metamaterial properties,and inside the C-band with ENG and MNG(Mu Negative)metamaterial properties.A good effective medium ratio(EMR)of 8.06 indicates the compactness and effectiveness of the proposed design.Further analysis has been done by changing the thickness of the substrate material as well and a significant change in the effective medium ratio is found.The validity of the proposed structure is confirmed by an equivalent circuit model.The simulated result agrees well with the calculated result.For exploring microwave sensing applications of the proposed unit cell,permittivity and pressure sensitivity performance were investigated in different simulation arrangements.The compact size,effective parameters,high sensitivity and a good EMR represent the proposed metamaterial as a promising solution for S-band and C-band microwave sensing applications.

Inkjet Printed Metamaterial Loaded Antenna for WLAN/WiMAX Applications

In this paper,the design and performance analysis of an Inkjetprinted 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 inkbased 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.