The design and validation of a dual polarization source for waveguide-coupled millimeter and sub-millimeter wave cryogenic sensors is presented. The thermal source is a waveguide mounted absorbing conical dielectric taper. The absorber is thermally isolated with a kinematic suspension that allows the guide to be heat sunk to the lowest bath temperature of the cryogenic system. This approach ena...

A simulation study of a Cu(In1 - xGax)Se2 (CIGS) thin film solar cell has been carried out with maximum efficiency of 24.27 % (Voc = 0.856 V, Jsc = 33.09 mA/cm(2) and FF = 85.73 %). This optimized efficiency is obtained by determining the optimum band gap of the absorber and varying the doping concentration of constituent layers. The Ga content denoted by x = Ga/(In + Ga) is selected as 0.35 wh...

this paper presents an e-ring shaped printed monopole antenna for uwb applications with dual notched bands performance. in order to generate single frequency band notch function, we applied a u-ring shaped monopole antenna, and by inserting a rectangular ring in the centre of it an e-ring shaped radiating patch created and a dual band-notch function can be achieved. the measured bandwidth of th...

In this paper, an ultra-wideband metamaterial absorber is designed and simulated. The proposed absorber is planar and low profile. It is made of a copper sheet coated with two dielectric layers. Each unit cell of the metamaterial structure is composed of multiple metallic split rings, which are patterned on the top and middle boundaries of the dielectrics. The designed absorber utilizes differe...

In order to solve the problem of low frequency noise engine, based on principle dual port asymmetric sound absorber, a kind gradually changing size absorbing metasurface is designed reduce engine acoustic liner. Firstly, theoretical analysis model and simulation resonance absorber are established, reduction mechanism revealed, influencing factors effect analyzed. Then an liner absorber. The ana...

In this paper, a dual-band compact absorber design based on split-ring resonator for WiMAX and WLAN bands is presented. Top plate of unit cell in the proposed composed three concentric circular split ring (SR) elements covers an area π×13.42 mm2 placed FR4 substrate with 1.5 mm thickness, dielectric constant 4.3 loss tangent 0.025. Also, six miniature metallic loadings are appropriately inserte...

In this paper, we proposed a tunable graphene-based metamaterial absorber (MA) at dual terahertz band to achieve perfect absorption. The electric field intensity distributions of demonstrated structure is illustrated explain the origin two absorption peaks. Simulation result shows MA owning polarization-insensitive property and wide incident angle tolerance. An inversion algorithm used extract ...