|
Document Type |
: |
Thesis |
|
Document Title |
: |
Design of Frequency Selective Surfaces in Designated Buildings to Block the Dual GSM Bands Signals تصميم أسطح إنتقائية الترددات في مباني خاصة لحجب إشارات الهاتف الجوال في نطاقٍ ترددي مزدوج للـGSM |
|
Subject |
: |
Faculty of Engineering |
|
Document Language |
: |
Arabic |
|
Abstract |
: |
This is a study of theoretical and practical dimensions (laboratory and field measurements) of a new dual band-stop Frequency Selective Surface (FSS) geometries for shielding application. The objective of this research is to assess and highlight the importance of applying innovative and environment friendly solutions to selectively attenuate the 900/1800 MHz GSM propagation through modern buildings such as mosques, hospitals, and military installations without disturbing other type of communication systems. Novel non-conventional dual-band FSSs are designed and analyzed. Prototypes of the proposed FSS model are fabricated according to the modeled designs. I carried out two different measurements, the first laboratory measurements and the second measurements were carried out in more practical environment by creating a dummy room, and the test was conducted without shielding any RF signal and with selectively shielding using FSS filter solution. Measurement results satisfied the theoretical results. Each proposed FSS offered more than ˗20 dB shielding covering both GSM bands (GSM900 GSM1800), it was also extended to cover the UMTS 2100MHz band. As compared to other techniques based on double square loop, the proposed structures reduce the FSS unit cell dimensions by more than 34% while maintaining a good stability at various incident angles, up to 60°, for both TE and TM polarizations. Each FSS structure is designed on a single layer of different material (FR4 and clear glass) which provides the ease of manufacturing with reduced cost if compared to the multilayer configurations. This research clearly shows that FSS attenuates reception of the selected band signals. Hence, it is a potential candidate for blocking GSM, UMTS, and other mobile phone standards or generations. Furthermore, FSS shielding solution is passive, where it does not need power to function. Another merit of this technique is that it is easy to install, maintenance free, and it does not require additional network configuration. It is also operator independent and suitable for some type of buildings such as mosques. This shielding solution can be implemented either in new installations or as retrofitting of the existing buildings. |
|
Supervisor |
: |
Prof. Dr. Rabah W. Aldhaheri |
|
Thesis Type |
: |
Master Thesis |
|
Publishing Year |
: |
1439 AH
2017 AD |
|
Added Date |
: |
Tuesday, December 12, 2017 |
|
Researchers
| يوسف عبدالله مناع | Mannaa, Yousef Abdullah | Researcher | Master | |
|