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

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Millimetre-Wave Components Based on Groove Gap Waveguide Technology :/
其他題名:	Design and Development.
作者:	Al-Juboori, Bahaa Jasim Mousa.
面頁冊數:	1 online resource (159 pages)
附註:	Source: Dissertations Abstracts International, Volume: 84-01, Section: B.
Contained By:	Dissertations Abstracts International84-01B.
標題:	Propagation. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29191715click for full text (PQDT)
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. - 1 online resource (159 pages)

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

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

Includes bibliographical references

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.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798835547906Subjects--Topical Terms:

3680519
Propagation.
Index Terms--Genre/Form:

542853
Electronic books.

Millimetre-Wave Components Based on Groove Gap Waveguide Technology : = Design and Development.
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245 1 0 $a Millimetre-Wave Components Based on Groove Gap Waveguide Technology : $b Design and Development.
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500 $a Source: Dissertations Abstracts International, Volume: 84-01, Section: B.
500 $a Advisor: Zhou, Jiafeng.
502 $a Thesis (Ph.D.)--The University of Liverpool (United Kingdom), 2022.
504 $a Includes bibliographical references
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.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2023
538 $a Mode of access: World Wide Web
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650 4 $a Polymers. $3 535398
650 4 $a Integrated circuits. $3 584067
650 4 $a Manufacturing. $3 3389707
650 4 $a Satellite communications. $3 3694420
650 4 $a Bandwidths. $3 3560998
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650 4 $a Radiation. $3 673904
650 4 $a Technology. $3 531676
650 4 $a Aerospace engineering. $3 1002622
650 4 $a Electrical engineering. $3 649834
650 4 $a Electromagnetics. $3 3173223
650 4 $a Engineering. $3 586835
650 4 $a Industrial engineering. $3 526216
650 4 $a Physics. $3 516296
650 4 $a Polymer chemistry. $3 3173488
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710 2 $a The University of Liverpool (United Kingdom). $3 1684840
773 0 $t Dissertations Abstracts International $g 84-01B.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29191715 $z click for full text (PQDT)