Abstract In this paper, a novel ultra-thin and multi-band radar absorber structure using cylindrical frequency selective surfaces (FSS) is proposed. The unit cell of the consists curved square ring printed on dielectric spacer to realize strong resonance achieve efficient absorption incident microwave energy. use FSS coating results in considerable decrease cross section perfect electric cylind...

Parkinson's patients suffer from severe tremor due to an abnormality in their central oscillator. Medications used to decrease involuntary antagonistic muscles contraction can threaten their life. However, mechanical vibration absorbers can be used as an alternative treatment. The objective of this study is to provide a dynamic modeling of the human hand that describes the biodynamic response o...

A co-solvent, dimethylsulfoxide (DMSO), is added to the aqueous chemical "bath" deposition (CBD) process used to grow ZnOS buffer layers for thin film Cu2ZnSnSe4 (CZTSe) solar cells. Device performance improves markedly as fill factors increase from 0.17 to 0.51 upon the co-solvent addition. X-ray photoelectron spectroscopy (XPS) analyses are presented for quasi-in situ CZTSe/CBD-ZnOS interface...

In this paper, two compact quad-channel and six-channel diplexer are designed and fabricated using defected microstrip structure (DMS). This structure is designed for the desired frequency based on the literature reviews. The proposed configuration is composed of a conventional T-junction divider with two pairs of open bended stubs and dual/tri-band filters. In designing dual band filters, a lo...

body centric wireless communication (bcwc) has been the topic of much research in recent years. in this manuscript, a novel low-cost microstrip patch antenna is designed for on-/off-body communications with a dual-band operation. the proposed structure exhibits a monopole-like radiation pattern at 2.45ghz and a broadside radiation at 4.8ghz, simultaneously. lateral dimensions of 42 mm × 46 mm a...

GRB 971214 is the third gamma ray burst for which an optical afterglow has been detected. I show that the spectrum of this afterglow (optical and X-ray) is inconsistent with the relativistic blast-wave model unless a significant source of extinction is introduced. Assuming that a single absorber exists at redshift z, I find that its V -band absorption magnitude at this redshift is AV (z) = 1.00...

An infrared perfect absorber structure is designed based on GaAs/Au/SiO2 metamaterial with numerical simulation, in which gold split ring resonators (SRR) embedded the GaAs layer. The absorption exceeds 99% at 1360 nm under plane wave excitation its polarization perpendicular to opening direction of SRR. When parallel direction, 97% and 56% 970 2070 nm, respectively, realize dual-band absorptio...

Device modeling and simulation of a mechanically stacked CuGaSe2/Cu(In1-x,Gax)Se2 (CGS/CIGS) tandem solar cell have been carried out in this study. The physical model consists of a CIGS bottom cell with a double graded band-gap profile in the space charge region (SCR) and the backside of the absorber layer and a uniform band-gap CGS top cell. By varying the absorber layer thickness of the CGS t...