| Author | Miraj-E-Mostafa, Md. |
| Call Number | AIT Thesis no.TC-97-10 |
| Subject(s) | Electromagnetic compatibility
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering. |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. TC-97-10 |
| Abstract | Analysis of the possible channels in the shielding wall, during shielding effectiveness (SE) measurement, shows two distinctly different types of leaking sources for low frequency and high frequency region. Recent necessity of using higher frequency range imposes great urgency of thorough investigation of this so far neglected high frequency range in terms of EMC. The high frequency model becomes applicable as soon as structural imperfections become comparable to the wavelength, creating multiple leakage through the wall structure and thus high frequency model is to take care of all the three regions of propagation pass - inside the enclosure, wall region and outside the enclosure. To encounter the high frequency problem and help cost efficient and time saving installation of shielded enclosure a kind of inexpensive and adequately accurate theoretical SE computation method, based on circuit approach, is presented here for microwave frequency range. Propagation of electromagnetic waves inside and outside the shielding enclosure is modeled using well established modeling approaches in order to describe the entire picture of the electromagnetic environment in respective regions. As per the analysis over commercially available shielded enclosure indication, waveguide model is applied here to treat each structural imperfection inside the shield region as coupling slot. Flexibility of the SE calculation method allows to change enclosure structural configuration, modify measurement setup, and vary constructing materials. The method takes into account guaranteed tolerance and assembling technology, used during the implementation stage, as well as the way test engineers evaluate SE value during the acceptance test to imitate the real life picture. Expressed analysis of the shielding performance is especially valuable for final enclosure evaluation when preparing for the acceptance test, in the case of reconfiguration of measurement facility, for troubleshooting and as well as training of personnel. |
| Year | 1997 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. TC-97-10 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Information and Communications Technologies (DICT) |
| Academic Program/FoS | Information and Communication Technology (ICT) |
| Chairperson(s) | Ahmed, Kazi Mohiuddin |
| Examination Committee(s) | Kimmo Makelainen;Premanandana Rajatheva |
| Scholarship Donor(s) | Government of Finland. |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1997 |