Performance enhancement of salisbury screen microwave absorber using dual-layer frequency selective surfaces (FSS)
This project presents design of Salisbury screen absorber using dual layers of frequency selective surface FSS. By using this design, the Salisbury screen able to provide dual absorbtion bands and this can improve the overall operating bandwidth. The performance improvement is obtained when fr...
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| Format: | Thesis |
| Language: | English English English |
| Published: |
2013
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/2120/1/24p%20SALEH%20OMAR%20MOHAMED.pdf http://eprints.uthm.edu.my/2120/2/SALEH%20OMAR%20MOHAMED%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/2120/3/SALEH%20OMAR%20MOHAMED%20WATERMARK.pdf |
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| Summary: | This project presents design of Salisbury screen absorber using dual layers of
frequency selective surface FSS. By using this design, the Salisbury screen able to
provide dual absorbtion bands and this can improve the overall operating bandwidth.
The performance improvement is obtained when frequency selective surfaces (FSS)
is sandwiched between the outermost 377 V/square resistive sheet and the ground
plane. In this project the dimension of the cross dipole FSS has been optimized
using different length at different layers of FSS. Each FSS is positioned a quarter
wavelength separation from the resistive sheet to provide impedance matching at
377ohm and therefore generating several absorption bands. The simulated result
by CST Microwave Studio shows by using this strategy, three distinct absorption
bands with bandwidth of 36%, 12 and 16 % centered at 6.6, 9.2 and 13 GHz
respectively, this is relatively larger relatively compare to a classical Salisbury
screen having the same thickness. The simulated results have been verified in
measurement where the FSSs were fabricated on FR4 board over frequency range of
8 to 12 GHz. The results obtained have revealed that there are good agreements
between the simulation and measurement results. |
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