Pushpakaran, Sarin V.
Raj, Rohith K.
P. V., Vinesh
R., Dinesh
Mohanan, P.
Vasudevan, K.
A novel metaresonator inspired dual band antenna for 2.4/5.2 GHz WLAN applications is presented. Dual band operation is achieved by utilizing stacking technique on a dog bone shaped dipole antenna. Stacking excites the magnetic resonance in addition to the existing dipole resonance in the structure yielding the dual band design. The antenna has a 2:1 VSWR bandwidth of 12% for the lower dipole resonance centered around 2.47 GHz and 10.5% for the second resonance at 5.18 GHz which is wide enough to cover the 2.4GHz and 5.2 GHz WLAN applications. The antenna is made of a low cost FR4 substrate of relative permittivity 4.4 and height 1.6 mm and has a total dimension of 38 x 40 x 3.2 mm(3). Experimental and simulation studies of the antenna including the stacking height variation and resonant mechanisms are explained in detail in this communication.
Pushpakaran, Sarin V.
Purushothaman, Jayakrishnan M.
Chandroth, Aanandan
Pezholil, Mohanan
Kesavath, Vasudevan
The theory of diffraction limit proposed by H.A Bethe limits the total power transfer through a subwavelength hole. Researchers all over the world have gone through different techniques for boosting the transmission through subwavelength holes resulting in the Extraordinary Transmission (EOT) behavior. We examine computationally and experimentally the concept of EOT nature in the microwave range for enhancing radiation performance of a stacked dipole antenna working in the S band. It is shown that the front to back ratio of the antenna is considerably enhanced without affecting the impedance matching performance of the design. The computational analysis based on Finite Difference Time Domain (FDTD) method reveals that the excitation of Fabry-Perot resonant modes on the slots is responsible for performance enhancement. (C) 2015 Author(s).
This article reports the radiation performance enhancement of an electrically small antenna using sub-wavelength metal strip grating, in the microwave frequency regime. The sub-wavelength grating converts the high spatial-frequency components of radiation emitted from an inductor loaded truncated-ground open coplanar antenna into a low spatial far-field spectrum. The spectral conversion results in enhanced efficiency and radiated power gain in the S-band corresponding to TE polarization. The gain of the antenna is enhanced from -9.74 dBi to 1.6 dBi for TE polarization. The prototypes are fabricated in-house and the design is validated experimentally.
Pushpakaran, Sarin V.
SeidMuhammed, Nishamol M.
Raj, Rohith K.
Pradeep, Anju
Mohanan, P.
Vasudevan, Kesavath
A simple stacked metal slab antenna with directional broadside radiation coverage suitable for wireless applications is presented. The directional broadside radiation pattern is obtained by stacking the printed metal slab dipole antenna with the same element. The design utilizes the coupling of magnetic and electrical resonances of the coupled slabs to ensure directional radiation characteristics. The design has a front-to-back ratio of 15 dB and occupies an overall dimension of 44 x 18 x 4.8 mm(3) when printed on a substrate of dielectric constant 4.4. Details of the design along with experimental, simulation, and finite-difference time-domain (FDTD) computed results are presented and discussed.
Pushpakaran, Sarin V.
Raj, Rohith K.
Pradeep, Anju
Ouseph, Lindo
Hari, Mridula
Chandroth, Aanandan
Pezholil, Mohanan
Kesavath, Vasudevan
Inspired by the work of Bethe on electromagnetic transmission through subwavelength hole, there has been immense interest on the extraordinary transmission through subwavelength slot/slit on metal plates. The invention of metamaterials has boosted the extra ordinary transmission through subwavelength slots. We examine computationally and experimentally the concept of metamaterial cover using an array of split ring resonators (SRRs), for enhancing the transmission in a stacked dipole antenna working in the S band. The front to back ratio is considerably improved by enhancing the magnetic resonant strength in close proximity of the slit of the upper parasitic dipole. The effect of stacking height of the SRR monolayer on the resonant characteristics of the split ring resonators and its effect on antenna radiation characteristics has been studied.
T.H. Mahato
G.K. Prasad
Beer Singh
A.R. Srivastava
K. Ganesan
J. Acharya
R. Vijayaraghavan
Reactions of sulphur mustard and sarin were studied on the surface of V1.02O2.98 nanotubes by gas chromatography and gas chromatography–mass spectrometry techniques. The V1.02O2.98 nanotube samples were made by using hydrothermal method and characterized by scanning electron microscopy, nitrogen adsorption, X-ray diffractometry and thermogravimetry. Later, they were exposed to sulphur mustard and sarin separately at ambient temperature (30 ± 2 °C). The data explored the formation of sulphoxide of sulphur mustard, thiodiglycol for sulphur mustard and isopropyl methyl phosphonic acid for sarin on V1.02O2.98 nanotubes illustrating the role of oxidation and hydrolysis reactions in the decontamination.
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