scholarly journals Nanoparticles-decorated coal tar pitch-based carbon foam with enhanced electromagnetic radiation absorption capability

RSC Advances ◽  
2015 ◽  
Vol 5 (26) ◽  
pp. 20256-20264 ◽  
Author(s):  
Rajeev Kumar ◽  
Ashish Gupta ◽  
Sanjay R. Dhakate
Keyword(s):  
Electromagnetic Radiation ◽  
Coal Tar ◽  
Carbon Foam ◽  
Frequency Region ◽  
Radiation Absorption ◽  
Coal Tar Pitch ◽  
Band Frequency ◽  
X Band

Carbon foam decorated with magnetic and dielectric nanoparticles exhibited significantly improved EM radiation absorption in the X-band frequency region.

Coal tar pitch based carbon foam for thermal insulating material

2016 ◽  
Vol 169 ◽  
pp. 95-98 ◽  
Author(s):  
Yanli Wang ◽  
Ziguo He ◽  
Liang Zhan ◽  
Xiang Liu
Keyword(s):  
Coal Tar ◽  
Carbon Foam ◽  
Coal Tar Pitch ◽  
Insulating Material ◽  
Thermal Insulating

Perfect metamaterial absorbers with polarization angle independency in X-band waveguide

2016 ◽  
Vol 30 (11) ◽  
pp. 1650186 ◽  
Author(s):  
Cumali Sabah
Keyword(s):  
Wireless Communication ◽  
Frequency Region ◽  
Polarization Angle ◽  
Perfect Absorption ◽  
Band Frequency ◽  
X Band ◽  
Resonance Frequencies ◽  
Metamaterial Absorbers ◽  
Space Boundary

The design and characterization of perfect metamaterial absorbers (MAs) based on simple configurations including square- and triangle-shapes, which operate in X-band frequency region are numerically and experimentally investigated. The proposed MAs provide perfect absorption with the polarization angle independency. In X-band waveguide, the absorption rates are 99.69% and 99.97% at the resonance frequencies of 10.57 GHz and 10.93 GHz for the square- and triangle-shaped MAs, respectively. In addition, the same configurations are numerically tested under free space boundary conditions to compare and discuss the obtained results. The suggested MAs enable myriad potential application areas for security and stealth technologies in X-band including wireless communication.

scholarly journals The Detection of Chemical Materials with a Metamaterial-Based Sensor Incorporating Oval Wing Resonators

Electronics ◽  
2020 ◽  
Vol 9 (5) ◽  
pp. 825 ◽  
Author(s):  
Yadgar I. Abdulkarim ◽  
Lianwen Deng ◽  
Muharrem Karaaslan ◽  
Şekip Dalgaç ◽  
Rashad Hassan Mahmud ◽  
...  
Keyword(s):  
Transmission Line ◽  
Frequency Region ◽  
Simulation Studies ◽  
Amplitude Variation ◽  
Layer Width ◽  
Band Frequency ◽  
Sensor Layer ◽  
X Band ◽  
Highly Sensitive ◽  
Chemical Materials

The detection of branded and unbranded chemical materials is essential for the quality control assessment. In this work, a metamaterial inspired sensor is designed and fabricated, which incorporates oval-shaped wing resonators, in order to use to detect branded and unbranded diesels in the X-band frequency region. The simulation studies were carried out by using the Computer Simulation Technology (CST) Microwave studio. A transmission line was introduced into the sensor design and genetic algorithm was used to optimize the proposed structure. Parametric study was investigated by changing the permittivity, permeability of the sensor layer, width of the transmission line, materials of the substrate layer, and width of the resonator. Results showed that different factors can be considered to sense the chemical materials including the shift in resonant frequency and amplitude variation in the reflection or transmission spectrum. It was found that the sensible variation in the transmission value is about −3.2 dB, which is superior to that reported in literature. It was concluded that the sensor is highly sensitive to distinguish the branded diesel from the unbranded one, which makes it viable for detecting fluidics in the chemical industry and medicine.

scholarly journals STUDY OF MICROSTRIP PATCH ARRAY ANTENNA FOR SIDE LOBE SUPPRESSION IN THE X-BAND REGION USING UNIFORM, BINOMIAL AND TSCHEBYSCHEFF EXCITATION METHODS

2020 ◽  
Vol 21 (1) ◽  
pp. 61-72
Author(s):  
Sarah Yasmin Mohamad ◽  
Ahmad Alhadi Ruslan ◽  
Khairayu Badron ◽  
Ahmad Fadzil Ismail ◽  
Norun Farihah Abdul Malek ◽  
...  
Keyword(s):  
Side Lobe ◽  
High Gain ◽  
Frequency Region ◽  
Array Antenna ◽  
Angular Width ◽  
Side Lobe Level ◽  
Reflector Antennas ◽  
Band Frequency ◽  
Microstrip Patch ◽  
X Band

In this paper, a microstrip patch array antenna is designed and simulated to operate in the X-band frequency region at 9.5 GHz. For X-band communication transmission, it is necessary to suppress the side lobe radiation pattern of the antenna as much as possible to avoid the transmission being intercepted and/or received by undesirable neighbouring satellites. The geometrical design of the microstrip patch array antenna is simulated and executed using CST Microwave Studio (CST MWS) in order to study the effects of various antenna parameters such as S11, gain, directivity, side lobe level, and angular width. It is shown that the proposed antenna exhibits a low side lobe level of -14.2 dB with an acceptable high gain and directivity of 16.5 dB and 17.7 dB, respectively. The antenna configuration also has a size of only 285 mm × 59.275 mm which is much more compact and lightweight compared to the standard reflector antennas that are used for most X-band communication transmission. ABSTRAK:  Kajian ini berkaitan antena cantuman barisan jalurmikro yang direka dan disimulasi beroperasi pada 9.5 GHz frekunsi daerah jalur-X. Pada transmisi komunikasi jalur-X, corak radiasi sisi-lobus antena perlu ditahan sebanyak mungkin bagi mengelak transmisi dipintas dan/atau diterima oleh satelit tetangga yang tidak di ingini. Rekaan geometri antena cantuman barisan jalurmikro disimulasi dan diuji menggunakan perisian CST Studio Gelombang Mikro (CST MWS) bagi mengkaji pelbagai kesan parameter antenna seperti S11, gandaan, keterarahan, tahap sisi-lobus dan lebar sudut. Didapati bahawa antena yang dicadangkan mempunyai tahap sisi-lobus -14.2 dB yang rendah dengan gandaan tinggi yang boleh diterima dan keterarahan sebanyak 16.5 dB dan 17.7 dB, masing-masing. Tatabentuk antena mempunyai saiz 285 mm × 59.275 mm yang kompak dan ringan berbanding antena pemantul piawai, di mana telah digunakan pada kebanyakan jalur-X transmisi komunikasi.

Free-standing honeycomb-like N doped carbon foam derived from coal tar pitch for high-performance supercapacitor

2020 ◽  
Vol 506 ◽  
pp. 145014 ◽  
Author(s):  
Yanzhong Wang ◽  
Yuexin Liu ◽  
Donghua Wang ◽  
Chao Wang ◽  
Li Guo ◽  
...  
Keyword(s):  
High Performance ◽  
Coal Tar ◽  
Carbon Foam ◽  
Coal Tar Pitch ◽  
Free Standing

Effect of different parameters on porosity and compressive strength of coal tar pitch derived carbon foam

2019 ◽  
Vol 95 ◽  
pp. 83-90 ◽  
Author(s):  
Chandrachur Banerjee ◽  
Vimal Kumar Chandaliya ◽  
Pratik Swarup Dash ◽  
Bhim Charan Meikap
Keyword(s):  
Compressive Strength ◽  
Coal Tar ◽  
Carbon Foam ◽  
Coal Tar Pitch
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