Design Of Quasi-Lumped Element Bandpass Filter
This dissertation demonstrates the design of quasi-lumped element bandpass filters operating at 2 GHz. The design was simulated before being implemented, because it was easy to make a mistake in the calculations and waste a lot of time. Agilent Advance Design System software (ADS) a computer-a...
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Main Author: | |
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Format: | Monograph |
Language: | English |
Published: |
Universiti Sains Malaysia
2006
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Subjects: | |
Online Access: | http://eprints.usm.my/58623/1/Design%20Of%20Quasi-Lumped%20Element%20Bandpass%20Filter_Cho%20Sheau%20Fen.pdf http://eprints.usm.my/58623/ |
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Summary: | This dissertation demonstrates the design of quasi-lumped element bandpass
filters operating at 2 GHz. The design was simulated before being implemented,
because it was easy to make a mistake in the calculations and waste a lot of time.
Agilent Advance Design System software (ADS) a computer-aided design CAD tool is
used for the simulation purpose. In implementation, substrate Duroid is selected. The
first part of this dissertation, the quasi-lumped element resonator consisting of the
interdigital capacitor parallel with a straight line or meander line inductor is designed.
The frequency response of the resonator depends on the length, width, number of
interdigital fingers and gap is used in the quasi-lumped element resonator design. The
advantage of using microstrip quasi-lumped element resonator is low loss because it
reduces the connection between devices and PCB. Beside that, this resonator design is
more low-cost, compact and simple to realize by comparing to the other resonators
structure. The second part of this dissertation, a quasi-lumped element bandpass filter is
built using three quasi-lumped element resonators. The final design is fabricated on
Duroid-type printed circuit board after simulation. Measurement will be carried out
using the vector network analyzer (VNA) after the fabrication. The network analyzer
instrument is used to measure the scattering parameters (magnitude and phase) of two-port microwave network. The simulation and measurement result will be discussed in
this dissertation. A meander line inductor achieves further filter miniaturization. Low-insertion loss, high return loss and high Q factor are simultaneously required for filters.
In addition, these filters should be compact, low-cost, and high performance. This
project includes literature review, simulation, fabrication and measurement. |
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