| Author | Xu, Lin |
| Call Number | AIT Thesis no.TC-97-8 |
| 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-97-8 |
| Abstract | According to international standards, EMC measurement has to be performed in an
open area test site or its equivalent test site, such as a semi-anechoic chamber. To validate a
test site, site attenuation test must be performed in that particular site. If the measured
normalized site attenuation is within the 4dB range of the standard value, the site can be
considered as qualified.
To predict the performance of a semi-anechoic chamber before its construction and to
find out the reason which may lead measured site attenuation exceed the limitation, a
theoretical model must be considered.
The existing model using ray tracing theory generally models the measurement
antennas as a theoretical half-wave dipole antennas. This antenna model is appropriate for
some EMC measurement antennas, such as tunable dipole and biconical antenna. However,
when this antenna model is used to represent the measured results made with log-periodic
dipole antennas, significant discrepancy appears (Gavenda, 1993).
In this study, a general chamber model using ray tracing theory is developed. Since the
model allows the true radiation pattern of different antennas to be included, it can be used for
all types of EMC antennas.
Based on the developed chamber model, the effect of log-periodic antenna has been
studied and the method to eliminate the error caused by log-periodic antenna are also
proposed. |
| Year | 1997 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. TC-97-8 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Information and Communications Technologies (DICT) |
| Academic Program/FoS | Telecommunications (TC) |
| Chairperson(s) | Ahmed, Kazi Mohiuddin |
| Examination Committee(s) | Zhang, Jian-Guo;Lehtimaki, Seppo |
| Scholarship Donor(s) | Nokia Telecommunications, Finland |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1997 |