Improvement of technique to convert Chebyshev, Butterworth and composite low pass filter into microstrip circuit
The aim of this thesis is to improve the technique of converting Chebyshev, Butterworth and Composite Low Pass Filter into microstrip line circuit operating at Ultra-High Frequency (UHF) band (2.5 GHz) for wireless communication system. An improved technique for transforming lumped circuit into mi...
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| Format: | Thesis |
| Language: | English |
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| Online Access: | http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/59429/1/Page%201-24.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/59429/2/Full%20text.pdf |
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| Summary: | The aim of this thesis is to improve the technique of converting Chebyshev, Butterworth and Composite Low Pass Filter into microstrip line circuit operating at Ultra-High
Frequency (UHF) band (2.5 GHz) for wireless communication system. An improved
technique for transforming lumped circuit into microstrip line circuit for all high-order
Chebyshev, Butterworth and Composite low pass filter is introduced. The high-order
Butterworth and Chebyshev low pass filters are designed with a band pass ripple of 0.01 dB
of order, n=3, 4, 5, 6, 7, 8 and 9, and implemented on FR4. The circuits are simulated and
developed using Advanced Design System (ADS) without applying any optimization in
order to maintain the actual response characteristic. The filters are then converted into
microstrip lines using fringing compensation technique. A fringing compensation factor has
been considered due to fringing in microstrip inductor and microstrip capacitor. The
analytical results of lumped circuit are compared to the proposed microstrip line circuit
transformed of lumped circuit. The ADS simulation results show that the response of the
microstrip circuit for all types of low pass filter with fringing compensation factor have
excellent agreement with its lumped circuit. Overall, the simulation results have
accomplished excellent agreement with measurement results of all 3 types of microstrip low
pass filters. It shows that the proposed technique achieved good agreement with the lumped
circuit design. In other words, this technique is able to transform the design of high order
Butterworth, Chebyshev, and Composite low pass filters into microstrip line circuit. The
return loss (S11) which represents a matching response has achieved values greater than 20
dB. The results show that the insertion loss is less than 1 dB, whereby about 80% of the
transmitted signal is received by the load. The achieved frequency response performance at
the stopband (S21 at 2fc) is more than 40 dB. The output performance is improved as the
number of order increases, and more unwanted frequency can be eliminated. |
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