Fabrication of frequency selective structure and evaluation of microwave transmission on energy saving glass
The use of energy saving glass has become very popular in the modern day building design. This energy saving property is achieved by applying a very thin tin oxide (SnO2) coating on one side of the glass. This coating can provide good thermal insulation to the buildings by blocking infrared ra...
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| Format: | Thesis |
| Language: | English English English |
| Published: |
2015
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/1529/1/24p%20LIM%20HUEY%20SIA.pdf http://eprints.uthm.edu.my/1529/2/LIM%20HUEY%20SIA%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/1529/3/LIM%20HUEY%20SIA%20WATERMARK.pdf |
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| Summary: | The use of energy saving glass has become very popular in the modern day building
design. This energy saving property is achieved by applying a very thin tin oxide
(SnO2) coating on one side of the glass. This coating can provide good thermal
insulation to the buildings by blocking infrared rays while being transparent to
visible part of the spectrum. Drawbacks of these energy saving windows is that it
also attenuates the transmission of useful microwave signals through them. These
signals fall within the frequency band of 0.8GHz to 2.2GHz. In order to pass these
signals through the coated glass, the use of aperture type frequency selective surface
(FSS) has being proposed. In the present work, SnO2 thin film with FSS structure
was fabricated using RF magnetron sputtering technique and printed circuit board
technology. Deposition time, dissipation power and oxygen flow rate were varied
during the sputtering deposition process. Atomic force microscopy (AFM) and field
emission-scanning electron microscopy (FE-SEM) were used to analyze the surface
morphology and roughness of the SnO2 thin film. Two point electrical probe analysis
was used to determine the sheet resistance and resistivity of the SnO2 thin film.
Thickness of SnO2 thin film was measured using surface profiler. Good correlation
between the surface properties and electrical properties of SnO2 thin film was
obtained. Microwave transmission through SnO2 coated glass with FSS structure was
also analyzed using network analyzer. The result of computer simulation was
confirmed and consistent with the network analyzer results that showed the
improvement of SnO2 coated glass with the FSS structure. Thermal analysis
demonstrated that FSS structure had allows the transmission of GSM mobile signal
penetrate in the buildings while blocking the infrared light with the SnO2 film
properties. |
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