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Design of a Tunable Absorber Based on Active Frequency-Selective Surface for UHF Applications
- Source :
- Materials, Volume 12, Issue 23
- Publication Year :
- 2019
- Publisher :
- MDPI AG, 2019.
-
Abstract
- An ultrathin tunable absorber for the ultrahigh frequency (UHF) band is presented in this paper. The absorber is a single-layer structure based on the topology of a Salisbury screen, in which the conventional resistive layer is replaced by an active frequency-selective surface (AFSS) loaded with resistors and varactors. The reflectivity response of the absorber can be controlled by adjusting the reverse bias voltage for the varactors, which is verified by both simulated and measured results. The experimental results show that the reflectivity response of the absorber can be modulated below &minus<br />10 dB over a frequency band ranging from 415 to 822 MHz. The total thickness of the absorber, 10 mm, is equivalent to only &lambda<br />/72 of the lower limit frequency. The absorbing mechanism for the designed absorber is illustrated by simulating the volume loss density distributions. A detailed analysis is also carried out on the basis of these parameters, such as the AFSS shape, resistor, thickness of the foam, thickness and permittivity of the dielectric substrate, and incident angles, which contribute to the reflectivity of the AFSS absorber.
- Subjects :
- Permittivity
Materials science
Frequency band
Topology (electrical circuits)
02 engineering and technology
tunable absorber
Article
law.invention
law
0202 electrical engineering, electronic engineering, information engineering
General Materials Science
varactors
Salisbury screen
Resistive touchscreen
business.industry
digestive, oral, and skin physiology
020206 networking & telecommunications
021001 nanoscience & nanotechnology
active frequency-selective surface
Ultra high frequency
ultrahigh frequency
Optoelectronics
Resistor
0210 nano-technology
business
Voltage
Subjects
Details
- ISSN :
- 19961944
- Volume :
- 12
- Database :
- OpenAIRE
- Journal :
- Materials
- Accession number :
- edsair.doi.dedup.....70e4856a1d89fed791b6a92355a66e4c