scholarly journals Multiple-Band Terahertz Metamaterial Absorber Using Multiple Separated Sections of Metallic Rectangular Patch

2020 ◽  
Vol 8 ◽  
Author(s):  
Ben-Xin Wang ◽  
Yuanhao He ◽  
Pengcheng Lou ◽  
Nianxi Xu ◽  
Xiaoyi Wang ◽  
...  
Keyword(s):  
Metamaterial Absorber ◽  
Rectangular Patch ◽  
Multiple Band

scholarly journals Realization of multiple-band terahertz metamaterial absorber using two identical split rings having opposite opening directions connected by a rectangular patch

2022 ◽  
Author(s):  
Ben-Xin Wang ◽  
Wei Xu ◽  
Yangkuan Wu ◽  
Zhuchuang Yang ◽  
Shengxiong Lai ◽  
...  
Keyword(s):  
Surface Structure ◽  
Ground Plane ◽  
Metamaterial Absorber ◽  
Dielectric Slab ◽  
Rectangular Patch ◽  
Multiple Band

Multiple-band metamaterial absorber at terahertz regime using periodically arranged surface structure placed on ultra-thin thickness of insulating dielectric slab backed by a metallic ground plane is demonstrated in this paper....

scholarly journals Design of A Perfect Metamaterial Absorber for Microwave Applications

2021 ◽  
Vol 22 (1) ◽  
pp. 1-4
Author(s):  
Khalid Al-Badri
Keyword(s):  
Normal Incidence ◽  
Metamaterial Absorber ◽  
Absorption Bands ◽  
Band Frequency ◽  
Image Sensing ◽  
Rectangular Patch ◽  
Low Profile ◽  
X Band ◽  
Unit Cells ◽  
Perfect Metamaterial Absorber

In this manuscript, a multi-band and low-profile metamaterial absorber with polarisation independence from 00 to 450 is presented. The proposed metamaterial structure is composed of a single ring with a rectangular patch, consisting of periodic unit cells with a size of 150mm × 250mm × 1.5mm. The structure exhibits three absorption peaks under normal incidence, which cover the X-band. According to the results, the desired material can excellently absorb the electromagnetic wave signal, with an outstanding absorption rate of about 95% at the microwave x-band frequency. The proposed structure shows three absorption bands where two of them exceed 90% absorption level. The results displayed a high Q-factor of 103.5 at a resonance frequency of 8.58 GHz and the figure of merit (FOM) is 98.4, which can be used to enhance the sensor sensing, narrowband band filter and image sensing. The proposed structure is fabricated, and experiments are carried out to validate the design principle. Strong agreements are observed between the measured and the corresponding simulated results.

scholarly journals Research of Dumbbell Shaped DGS to Enhance the Bandwidth and Multiple Band Applications

2019 ◽  
Vol 9 (2) ◽  
pp. 4584-4589
Keyword(s):  
Satellite Communications ◽  
Radiation Characteristics ◽  
Resonant Frequencies ◽  
Rectangular Patch ◽  
X Band ◽  
Epoxy Material ◽  
Multiple Band ◽  
Radar Satellite ◽  
Electrical Permittivity ◽  
Peak Gain

A monopole microstrip rectangular patch with dumbbell shape slotted on ground for multiple band, enhance the bandwidth. The proposed antenna is fabricated on FR 4 epoxy material with electrical permittivity of 4.4 and magnetic permeability 1.The dimensions of proposed antenna are 70 x 50 x 1.6 mm3 and the dumbbell shape is slotted on ground of substrate which resonates at four different frequencies 5.9 GHz, 7 GHz, 8.7 GHz and 9.7 GHz. The proposed antenna has bandwidths of 200 MHz 300 MHz, 300 MHz, 300 MHz at four resonant frequencies The proposed antenna covers 4/8 GHz C band, 8/12 GHz X band and used in radar, satellite communications. The reflection coefficient (S11), radiation characteristics, peak gain and VSWR of designed antenna are described

Multi-mode light microscopy of microtubule assembly dynamics and chromosome movement in vivo and In vitro

1996 ◽  
Vol 54 ◽  
pp. 730-731
Author(s):  
E. D. Salmon ◽  
J. C. Waters ◽  
C. Waterman-Storer
Keyword(s):  
Imaging System ◽  
Ccd Camera ◽  
Transmitted Light ◽  
Microtubule Assembly ◽  
Live Cells ◽  
Optical Efficiency ◽  
Multiple Band ◽  
Multi Mode

We have developed a multi-mode digital imaging system which acquires images with a cooled CCD camera (Figure 1). A multiple band pass dichromatic mirror and robotically controlled filter wheels provide wavelength selection for epi-fluorescence. Shutters select illumination either by epi-fluorescence or by transmitted light for phase contrast or DIC. Many of our experiments involve investigations of spindle assembly dynamics and chromosome movements in live cells or unfixed reconstituted preparations in vitro in which photodamage and phototoxicity are major concerns. As a consequence, a major factor in the design was optical efficiency: achieving the highest image quality with the least number of illumination photons. This principle applies to both epi-fluorescence and transmitted light imaging modes. In living cells and extracts, microtubules are visualized using X-rhodamine labeled tubulin. Photoactivation of C2CF-fluorescein labeled tubulin is used to locally mark microtubules in studies of microtubule dynamics and translocation. Chromosomes are labeled with DAPI or Hoechst DNA intercalating dyes.

Single-peak-regulation and wide-angle dual-band metamaterial absorber based on hollow-cross and solid-cross resonators

2020 ◽  
Vol 91 (3) ◽  
pp. 30901
Author(s):  
Yibo Tang ◽  
Longhui He ◽  
Jianming Xu ◽  
Hailang He ◽  
Yuhan Li ◽  
...  
Keyword(s):  
Transverse Electric ◽  
Surface Current ◽  
Dielectric Substrate ◽  
Transverse Magnetic ◽  
Metamaterial Absorber ◽  
Absorption Peak ◽  
Dual Band ◽  
Single Peak ◽  
Wide Angle ◽  
Surface Current Density

A dual-band microwave metamaterial absorber with single-peak regulation and wide-angle absorption has been proposed and illustrated. The designed metamaterial absorber is consisted of hollow-cross resonators, solid-cross resonators, dielectric substrate and metallic background plane. Strong absorption peak coefficients of 99.92% and 99.55% are achieved at 8.42 and 11.31 GHz, respectively, which is basically consistent with the experimental results. Surface current density and changing material properties are employed to illustrate the absorptive mechanism. More importantly, the proposed dual-band metamaterial absorber has the adjustable property of single absorption peak and could operate well at wide incidence angles for both transverse electric (TE) and transverse magnetic (TM) waves. Research results could provide and enrich instructive guidances for realizing a single-peak-regulation and wide-angle dual-band metamaterial absorber.

PERFORMANCE ANALYSIS OF DGS BASED RECTANGULAR PATCH ANTENNA FOR TRI-BAND APPLICATIONS

2020 ◽  
Vol 79 (11) ◽  
pp. 963-972
Author(s):  
V. Asokan ◽  
K. Senthilkumar ◽  
M. Palanivelan ◽  
J. Karthi ◽  
M. Lakshmanan
Keyword(s):  
Performance Analysis ◽  
Patch Antenna ◽  
Rectangular Patch
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