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Millimetre-Wave Components Based on Groove Gap Waveguide Technology: Design and Development.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Millimetre-Wave Components Based on Groove Gap Waveguide Technology: Design and Development./
Author:	Al-Juboori, Bahaa Jasim Mousa.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2022,
Description:	159 p.
Notes:	Source: Dissertations Abstracts International, Volume: 84-01, Section: B.
Contained By:	Dissertations Abstracts International84-01B.
Subject:	Propagation. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29191715
ISBN:	9798835547906

Millimetre-Wave Components Based on Groove Gap Waveguide Technology: Design and Development.
Al-Juboori, Bahaa Jasim Mousa.

Millimetre-Wave Components Based on Groove Gap Waveguide Technology: Design and Development. - Ann Arbor : ProQuest Dissertations & Theses, 2022 - 159 p.

Source: Dissertations Abstracts International, Volume: 84-01, Section: B.

Thesis (Ph.D.)--The University of Liverpool (United Kingdom), 2022.

This item must not be sold to any third party vendors.

Millimetre-wave (mmWave) passive devices have been a pivotal research topic for the last decades. Low loss, low mass and ease of manufacture for passive components operating at mmWave frequency bands and beyond are of high importance for aerospace and satellite applications. A vast number of mmWave components using various design technologies have been reported. For high-frequency applications, designers prefer conventional waveguides due to their low loss and high powerhandling capabilities. However, the poor contact between the joined waveguide parts is one of the drawbacks. Gap waveguide technology has been introduced as a promising and an alternative solution to the conventional waveguides, at mmWave frequency bands and beyond. A gap waveguide consists of two parallel plates, one acts as a perfect electrical conducting, while the other has a periodic structure of metal pins to act as an artificial magnetic conductor.The work of this thesis can be divided into three major parts: (i) A comprehensive review of the design technologies of mmWave passive devices is accomplished, exhibiting the advantages and features of using the metamaterial-based gap waveguide technology. (ii) A mmWave bandpass filter is designed and fabricated using two different manufacturing technologies (computer numerical control machining and high-resolution metalised polymer jetting 3D printing) showing the difference between the two fabricated counterparts in terms of performance and mass. The metalised 3D printed BPF exhibits lower mass and better performance. Such low mass and low loss for BPFs are of high importance for aerospace applications. (iii) A novel periodic pinform of gap waveguide structures is proposed to overcome the limitations of the traditional forms of pins. Instead of only full-height pins in a conventional gap waveguide, a combination of wall and pins constitutes the new pin-form.Four advantages can be achieved by using the proposed pin-form. First, the wave shielding will be much more effective at the operating band compared to the traditional full-height pins. Second, the bandwidth of the passband can be enhanced by moving the upper edge of the passband towards higher frequencies due to the use of shorter pins instead of full-height pins, with the same width and height of the groove. Third, a good matching between a groove gap waveguide structure and a standard waveguide port can be achieved without the need for a transition. The fourth advantage is the solid wall can be exploited to make a horizontal slot to be used for wave radiation. This is the first time that the sidewalls of gap waveguides can be used for slot radiation. Based on the proposed structure, two components, a cavity-backed slot antenna and a cavity-backed slot filtering antenna, are designed and experimentally tested to yield excellent results with the simulations.

ISBN: 9798835547906Subjects--Topical Terms:

1372600
Propagation.

Millimetre-Wave Components Based on Groove Gap Waveguide Technology: Design and Development.
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520 $a Millimetre-wave (mmWave) passive devices have been a pivotal research topic for the last decades. Low loss, low mass and ease of manufacture for passive components operating at mmWave frequency bands and beyond are of high importance for aerospace and satellite applications. A vast number of mmWave components using various design technologies have been reported. For high-frequency applications, designers prefer conventional waveguides due to their low loss and high powerhandling capabilities. However, the poor contact between the joined waveguide parts is one of the drawbacks. Gap waveguide technology has been introduced as a promising and an alternative solution to the conventional waveguides, at mmWave frequency bands and beyond. A gap waveguide consists of two parallel plates, one acts as a perfect electrical conducting, while the other has a periodic structure of metal pins to act as an artificial magnetic conductor.The work of this thesis can be divided into three major parts: (i) A comprehensive review of the design technologies of mmWave passive devices is accomplished, exhibiting the advantages and features of using the metamaterial-based gap waveguide technology. (ii) A mmWave bandpass filter is designed and fabricated using two different manufacturing technologies (computer numerical control machining and high-resolution metalised polymer jetting 3D printing) showing the difference between the two fabricated counterparts in terms of performance and mass. The metalised 3D printed BPF exhibits lower mass and better performance. Such low mass and low loss for BPFs are of high importance for aerospace applications. (iii) A novel periodic pinform of gap waveguide structures is proposed to overcome the limitations of the traditional forms of pins. Instead of only full-height pins in a conventional gap waveguide, a combination of wall and pins constitutes the new pin-form.Four advantages can be achieved by using the proposed pin-form. First, the wave shielding will be much more effective at the operating band compared to the traditional full-height pins. Second, the bandwidth of the passband can be enhanced by moving the upper edge of the passband towards higher frequencies due to the use of shorter pins instead of full-height pins, with the same width and height of the groove. Third, a good matching between a groove gap waveguide structure and a standard waveguide port can be achieved without the need for a transition. The fourth advantage is the solid wall can be exploited to make a horizontal slot to be used for wave radiation. This is the first time that the sidewalls of gap waveguides can be used for slot radiation. Based on the proposed structure, two components, a cavity-backed slot antenna and a cavity-backed slot filtering antenna, are designed and experimentally tested to yield excellent results with the simulations.
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