Design and development of wideband 3dB/90 couper using multiple-rows vias substrate integrated waveguide (SIW) technique

Substrate Integrated Waveguide (SIW) technique is a good candidate when designing a 3dB/90° coupler at high frequency as this technique exhibits low loss compared to traditional microstrip. In microstrip technique, some of the electric and magnetic field is propagating in the air (lower permittiv...

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Format:	Thesis
Language:	English
Subjects:	Substrate integrated waveguides Wave guides
Online Access:	http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/76735/1/Page%201-24.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/76735/2/Full%20text.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/76735/3/Declaration%20Form.pdf
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spelling	my-unimap-767352022-11-08T03:00:25Z Design and development of wideband 3dB/90 couper using multiple-rows vias substrate integrated waveguide (SIW) technique Siti Zuraidah, Ibrahim, Dr. Substrate Integrated Waveguide (SIW) technique is a good candidate when designing a 3dB/90° coupler at high frequency as this technique exhibits low loss compared to traditional microstrip. In microstrip technique, some of the electric and magnetic field is propagating in the air (lower permittivity compared to substrate), which contributes to the loss of the signal. The loss in microstrip is more significant when operating at high frequency. In contrast, a signal is travelling inside a substrate in SIW technique, guided by metallic vias at both side of the transmission lines. This propagation is similar to the waveguide propagation where no signal is propagating in the air. The possibility of signal loss can be happened through leakage between vias which lead to the performance degradation of the SIW coupler. The presented techniques to enhance the performance of SIW coupler in open literature either has limited bandwidth, larger dimension, or limited to simulated performance only. Therefore, the multiple-rows vias to enhance the operational bandwidth (>20%) of SIW coupler for high frequency applications is presented in this thesis. The proposed SIW coupler technique are designed, analysed and validated at two different frequency ranges, Ku-Band (11-17 GHz) and K-Band (20-26 GHz). Both designs are implemented on Roger RO4003c with thickness (h) of 0.508 and relative permittivity (ɛr) of 3.55. The proposed SIW coupler design optimization is investigated using CST Microwave Studio simulation tool. The investigation is started by sweeping different values of d (diameter of vias) and p (pitch between vias). Through the parametric study analysis, the optimum value of d and p to achieve the minimum insertion loss (S21, S31) is d=0.6 mm and p=0.92 mm, respectively. These optimized dimensions values are then applied in the next parametric study of the SIW couplers where at this stage, additional rows with different number of metallic vias are applied at the centre of both edge side of the coupler structure. It is revealed that the best performance of the SIW coupler can be achieved when 3 rows of metallic vias implemented at the centre of both edge side of the coupler structure. By considering return loss and isolation better than 10 dB, coupling coefficient of 3±1.5 dB and phase difference between output port of 90°±5°, the simulated results show an improved operational bandwidth of 43.88% at Ku-Band and 26.31% at K-Band. The experimental results of the proposed SIW coupler are accomplished using Agilent PNA-X 5245A PNA Network Analyzer where the measured results agree well with the simulated results. In overall, the proposed method for the SIW coupler features wide bandwidth with flat coupling response and better return loss and isolation. Accordingly, it has good potential to be implemented in high frequency application. Universiti Malaysia Perlis (UniMAP) Thesis en http://dspace.unimap.edu.my:80/xmlui/handle/123456789/76735 http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/76735/4/license.txt 8a4605be74aa9ea9d79846c1fba20a33 http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/76735/1/Page%201-24.pdf 426a2292bdc1c90eb448dde6be56665f http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/76735/2/Full%20text.pdf 26b8a59707062449b985d14bff0718a2 http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/76735/3/Declaration%20Form.pdf bade49d55c8be4dd6e64da471ff21648 Universiti Malaysia Perlis (UniMAP) Substrate integrated waveguides Wave guides School of Computer and Communication Engineering
institution	Universiti Malaysia Perlis
collection	UniMAP Institutional Repository
language	English
advisor	Siti Zuraidah, Ibrahim, Dr.
topic	Substrate integrated waveguides Wave guides
spellingShingle	Substrate integrated waveguides Wave guides Design and development of wideband 3dB/90 couper using multiple-rows vias substrate integrated waveguide (SIW) technique
description	Substrate Integrated Waveguide (SIW) technique is a good candidate when designing a 3dB/90° coupler at high frequency as this technique exhibits low loss compared to traditional microstrip. In microstrip technique, some of the electric and magnetic field is propagating in the air (lower permittivity compared to substrate), which contributes to the loss of the signal. The loss in microstrip is more significant when operating at high frequency. In contrast, a signal is travelling inside a substrate in SIW technique, guided by metallic vias at both side of the transmission lines. This propagation is similar to the waveguide propagation where no signal is propagating in the air. The possibility of signal loss can be happened through leakage between vias which lead to the performance degradation of the SIW coupler. The presented techniques to enhance the performance of SIW coupler in open literature either has limited bandwidth, larger dimension, or limited to simulated performance only. Therefore, the multiple-rows vias to enhance the operational bandwidth (>20%) of SIW coupler for high frequency applications is presented in this thesis. The proposed SIW coupler technique are designed, analysed and validated at two different frequency ranges, Ku-Band (11-17 GHz) and K-Band (20-26 GHz). Both designs are implemented on Roger RO4003c with thickness (h) of 0.508 and relative permittivity (ɛr) of 3.55. The proposed SIW coupler design optimization is investigated using CST Microwave Studio simulation tool. The investigation is started by sweeping different values of d (diameter of vias) and p (pitch between vias). Through the parametric study analysis, the optimum value of d and p to achieve the minimum insertion loss (S21, S31) is d=0.6 mm and p=0.92 mm, respectively. These optimized dimensions values are then applied in the next parametric study of the SIW couplers where at this stage, additional rows with different number of metallic vias are applied at the centre of both edge side of the coupler structure. It is revealed that the best performance of the SIW coupler can be achieved when 3 rows of metallic vias implemented at the centre of both edge side of the coupler structure. By considering return loss and isolation better than 10 dB, coupling coefficient of 3±1.5 dB and phase difference between output port of 90°±5°, the simulated results show an improved operational bandwidth of 43.88% at Ku-Band and 26.31% at K-Band. The experimental results of the proposed SIW coupler are accomplished using Agilent PNA-X 5245A PNA Network Analyzer where the measured results agree well with the simulated results. In overall, the proposed method for the SIW coupler features wide bandwidth with flat coupling response and better return loss and isolation. Accordingly, it has good potential to be implemented in high frequency application.
format	Thesis
title	Design and development of wideband 3dB/90 couper using multiple-rows vias substrate integrated waveguide (SIW) technique
title_short	Design and development of wideband 3dB/90 couper using multiple-rows vias substrate integrated waveguide (SIW) technique
title_full	Design and development of wideband 3dB/90 couper using multiple-rows vias substrate integrated waveguide (SIW) technique
title_fullStr	Design and development of wideband 3dB/90 couper using multiple-rows vias substrate integrated waveguide (SIW) technique
title_full_unstemmed	Design and development of wideband 3dB/90 couper using multiple-rows vias substrate integrated waveguide (SIW) technique
title_sort	design and development of wideband 3db/90 couper using multiple-rows vias substrate integrated waveguide (siw) technique
granting_institution	Universiti Malaysia Perlis (UniMAP)
granting_department	School of Computer and Communication Engineering
url	http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/76735/1/Page%201-24.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/76735/2/Full%20text.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/76735/3/Declaration%20Form.pdf
_version_	1776104273922228224

Design and development of wideband 3dB/90 couper using multiple-rows vias substrate integrated waveguide (SIW) technique

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