A novel modified fractal‐shaped slotted patch antenna employing metasurface at bottom plane along with partial ground has been proposed in this work for dual band applications with significant gain. A 4 × 5 order metasurface has been formed in the ground plane by introducing a periodic combination of two L‐type patches with centered C‐type shaped patch. The top conductor and the ground plane are designed on a 1.6 mm thick FR4 dielectric with the dimension of 28 × 28 mm2. The antenna is designed in such a way that it operates over the dual frequency ranges viz., 1.80 to 5.70 GHz and 10.38 to 10.94 GHz. The maximum return loss of 21 dB has been achieved over 2.60 GHz while the maximum realized gain of 7.16 dBi has been obtained at 10.92 GHz. The designed antenna offers omnidirectional radiation characteristics in the first band while directional radiation characteristics have been observed in the second band. The proposed antenna can be utilized for WiMAX 3.5/5.5 GHz, mobile, radio astronomy, and microimaging in medical analysis.
In this article, the performance of a meander-line-based microstrip patch antenna with split-ring resonator (SRR)-based slots and defected ground is analyzed at the terahertz frequency range. The designed antenna shows a multiband application within a frequency range of 3.77 to 6.60 THz and operates over six different frequencies (viz. 3.83 THz, 4.24 THz, 5.12 THz, 5.50 THz, 5.95 THz, and 6.50 THz). A maximum return loss of 37 is achieved over the band of 5.85 to 6.18 THz, while a maximum realized gain of 7.54 dBi and a total efficiency of 54% is obtained at 4.24 THz. The ground and radiating elements of the antenna are made of gold. Silicon dioxide is used as a substrate material. The antenna simulation is performed and reported in this study. The proposed antenna finds its applications in the detection of colon cancer, skin cancer, brain tumor, drug detection, and communication fields for point-to-point communication purposes. K E Y W O R D S defected ground, meander line, microstrip antenna, SRR slot, terahertz range 1This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Energy harvesting is expected to be ubiquitous and essential to modern-day life in the future. The limitations of ambient sources, such as thermal, mechanical, and solar, for energy harvesting can be overcome by RF energy harvesting for low-power devices. With the help of perfect metasurface absorbers, an electromagnetic wave can be used as an ambient source for energy harvesting. In this paper, a simple polarization-insensitive triple-band perfect metasurface absorber is proposed for RF energy harvesting applications. The three-layer (metal-dielectric-metal) meta-atom of the designed metasurface consists of a cross-shaped metal patch surrounded by slotted square-shaped metallic patches and of 9 × 9 meta-atoms. The absorber is typically developed in S-and C-bands with resonant frequencies of 3.06, 3.9, and 5.97 GHz. The absorption is near unity which persists over a wide angle of incidence. The experimental results are in close agreement, within 2%, with the simulation results. The reliability of the proposed absorber has been determined for the RF energy harvesting applications, and a high harvesting efficiency of 94.4% and 84% has been observed at 3.07 and 5.97 GHz, respectively.
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