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

Master of Science in Communication Engineering

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Bibliographic Details
Main Author: Nurehansafwanah, Khalid
Other Authors: Siti Zuraidah, Ibrahim, Dr.
Format: Thesis
Language:English
Published: Universiti Malaysia Perlis (UniMAP) 2018
Subjects:
Substrate integrated waveguides
Wave guides
Online Access:http://dspace.unimap.edu.my:80/xmlui/handle/123456789/76735
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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 Nurehansafwanah, Khalid Siti Zuraidah, Ibrahim, Dr. Substrate integrated waveguides Wave guides Master of Science in Communication Engineering 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. 2018 2022-11-08T03:00:25Z 2022-11-08T03:00:25Z Thesis http://dspace.unimap.edu.my:80/xmlui/handle/123456789/76735 en Universiti Malaysia Perlis (UniMAP) Universiti Malaysia Perlis (UniMAP) School of Computer and Communication Engineering
institution Universiti Malaysia Perlis
building UniMAP Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Perlis
content_source UniMAP Library Digital Repository
url_provider http://dspace.unimap.edu.my/
language English
topic Substrate integrated waveguides
Wave guides
spellingShingle Substrate integrated waveguides
Wave guides
Nurehansafwanah, Khalid
Design and development of wideband 3dB/90 couper using multiple-rows vias substrate integrated waveguide (SIW) technique
description Master of Science in Communication Engineering
author2 Siti Zuraidah, Ibrahim, Dr.
author_facet Siti Zuraidah, Ibrahim, Dr.
Nurehansafwanah, Khalid
format Thesis
author Nurehansafwanah, Khalid
author_sort Nurehansafwanah, Khalid
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
publisher Universiti Malaysia Perlis (UniMAP)
publishDate 2018
url http://dspace.unimap.edu.my:80/xmlui/handle/123456789/76735
_version_ 1751537964925583360
score 13.222552

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