Equivalent wire model and travelling wave mode method to analyse the radiated emission of a bent microstrip line
Nowadays, expeditious developments in the electrical and electronic territory due to endless demands from the markets have driven the operation frequency of the system into the gigahertz region. This had evolved into a more effectual-performance system, but also inflicts a lot of difficulties...
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| Format: | Thesis |
| Language: | English English English |
| Published: |
2009
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/7474/1/24p%20YEE%20SEE%20KHEE.pdf http://eprints.uthm.edu.my/7474/2/YEE%20SEE%20KHEE%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/7474/3/YEE%20SEE%20KHEE%20WATERMARK.pdf |
| Summary: | Nowadays, expeditious developments in the electrical and electronic territory due to
endless demands from the markets have driven the operation frequency of the system
into the gigahertz region. This had evolved into a more effectual-performance
system, but also inflicts a lot of difficulties to the designers, for examples
Electromagnetic Interference (EMI) problem and Signal Integrity (SI) issue. The
integrity of circuit layout is inevitably compromised by bifurcated traces for
examples T -junctions, Y -junctions, right-angle bends or left-angle-bends and steps
planar transmission lines in order to fulfil the needs of a denser printed circuit
boards. However, bifurcation often induces impedance mismatching resulting in
reflection, radiated emission and power loss. This research is to investigate the
radiated emission of 0°,45° and 90° bent microstrip lines by using an analytical
fODnulation followed by computer simulation and experimental measurements for
validation purposes. The novelty of this research is the implementation of travelling
wave mode (TWM) method on bent microstrip line by adopting the equivalent wire
model. The reliability of the formulation is proven from the agreement between the
analytical results and computer simulation, especially in predicting the E¢
component. The analytical results clearly showed the significance of the bent in
altering the radiation pattern of the microstrip line. Increasing the operating
frequency and microstrip's width tend to produce more emission. One of the electric
field components, Eo is almost symmetrical with respect to the bent angle/2 line on
the plane of the microstrip line, while the E¢ component radiates strongly into the
bent angle + bent anglel2 direction. The magnetic field on the bent microstrip line
experiences an abrupt change at the location of the bent. This change becomes
apparent as the bent angle increases. Future work should focus on improving the
analytical fornmlation so that it can predict the Eo component with higher accuracy.
FurtheDnore, effort can also be made on generating algorithm which takes into
consideration the composite electric field radiation of all the bents on a practical
printed circuit board. |
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