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Wideband, Highly Directional Antenna...

Son, Dong-Chan,

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Wideband, Highly Directional Antennas With Fixed and Steerable Patterns /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Wideband, Highly Directional Antennas With Fixed and Steerable Patterns // Dong-Chan Son.
Author:	Son, Dong-Chan,
Description:	1 electronic resource (190 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 86-03, Section: B.
Contained By:	Dissertations Abstracts International86-03B.
Subject:	Electromagnetics. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31486545
ISBN:	9798384048633

Wideband, Highly Directional Antennas With Fixed and Steerable Patterns /
Son, Dong-Chan,

Wideband, Highly Directional Antennas With Fixed and Steerable Patterns /Dong-Chan Son. - 1 electronic resource (190 pages)

Source: Dissertations Abstracts International, Volume: 86-03, Section: B.

This dissertation introduces various wideband, highly directional antennas and examines their design and performance. Initially, it discusses a dual-polarized quad-ridge horn (QRH) antenna with a 3:1 bandwidth. This antenna incorporates a spline-based aspheric dielectric lens with a unique protrusion at its base to ensure sufficient gain across ±4° field of view (FOV). The antenna features exponential-shaped horns and ridges to enhance impedance bandwidth and radiation pattern quality. It also includes a dual-polarization orthomode transducer (OMT) with a turnstile junction (TJ) and custom-designed single- and double-ridge waveguides. A coaxial transition has been developed to adapt the horn for non-waveguide-based transmitters. The design achieves a minimum gain of 21 dBi within the FOV and over 24 dBi in broadside gain, with low sidelobe levels (SLLs) below -15 dB and a cross-polarization discrimination exceeding 30 dB. The second part of the thesis proposes a wideband, dual-polarized QRH antenna, enabled by additive manufacturing (AM), that operates from 36 to 90 GHz. This modular setup integrates a QRH antenna, a waveguide OMT, a dielectric lens, and an absorber-lined cavity to control radiation patterns. Adding a plano-convex AM dielectric lens augments aperture efficiency to over 70% across the bandwidth. The configuration also features a cavity module with a current sheet absorber, significantly improving the SLL and beam efficiency (BE) and allowing for flush mounting. Achievements include a broadside gain exceeding 26 dBi and radiation and beam efficiencies above 75% and 88%, respectively, with SLLs below -25 dB.Further, the dissertation presents a 3-D printed wideband, multibeam array with an inhomogeneous lens operating from 36 to 90 GHz. This design consists of five double-ridge horn (DRH) antennas, an absorber-lined ring, a structural spacer, and a shielding cover. Integrating an annular ring-shaped structure with a current sheet absorber notably improves gain and SLL, while the shielding cover reduces electromagnetic interference/compatibility (EMI/EMC) risks. Employing digital light processing (DLP) 3-D printing technology enables prototype fabrication while maintaining tight tolerances. Performance metrics include gains of over 12 dBi for five feeds and a radiation efficiency above 62% at the high frequency end, with SLLs below -12 dB and minimal scan loss (< 0.5 dB).Finally, the thesis showcases a compact unit-cell design for a circularly polarized microstrip patch array. The unit-cell consists of four sequentially rotated microstrip patch elements with chamfered corners and a cross-slot mounted on a single substrate. This configuration results in a compact size and broadens the axial ratio (AR) and impedance bandwidths. The closely placed elements induce strong mutual coupling. The design methodology and its feasibility are substantiated with a 2x2 finite array prototype featuring integrated series power dividers. Experimental results demonstrate symmetric radiation patterns with a VSWR under 2:1 and a 1dB AR bandwidth over a 56% range, validating the design's application potential in various RF scenarios.

English

ISBN: 9798384048633Subjects--Topical Terms:

3173223
Electromagnetics.
Subjects--Index Terms:

Additive manufacturing

Wideband, Highly Directional Antennas With Fixed and Steerable Patterns /
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245 1 0 $a Wideband, Highly Directional Antennas With Fixed and Steerable Patterns / $c Dong-Chan Son.
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300 $a 1 electronic resource (190 pages)
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500 $a Source: Dissertations Abstracts International, Volume: 86-03, Section: B.
500 $a Advisors: Filipović, Dejan S. Committee members: Popović, Zoya B.; Scarborough, Cody; Elmansouri, Mohamed A.; Samaiyar, Aman.
502 $b Ph.D. $c University of Colorado at Boulder $d 2024.
520 $a This dissertation introduces various wideband, highly directional antennas and examines their design and performance. Initially, it discusses a dual-polarized quad-ridge horn (QRH) antenna with a 3:1 bandwidth. This antenna incorporates a spline-based aspheric dielectric lens with a unique protrusion at its base to ensure sufficient gain across ±4° field of view (FOV). The antenna features exponential-shaped horns and ridges to enhance impedance bandwidth and radiation pattern quality. It also includes a dual-polarization orthomode transducer (OMT) with a turnstile junction (TJ) and custom-designed single- and double-ridge waveguides. A coaxial transition has been developed to adapt the horn for non-waveguide-based transmitters. The design achieves a minimum gain of 21 dBi within the FOV and over 24 dBi in broadside gain, with low sidelobe levels (SLLs) below -15 dB and a cross-polarization discrimination exceeding 30 dB. The second part of the thesis proposes a wideband, dual-polarized QRH antenna, enabled by additive manufacturing (AM), that operates from 36 to 90 GHz. This modular setup integrates a QRH antenna, a waveguide OMT, a dielectric lens, and an absorber-lined cavity to control radiation patterns. Adding a plano-convex AM dielectric lens augments aperture efficiency to over 70% across the bandwidth. The configuration also features a cavity module with a current sheet absorber, significantly improving the SLL and beam efficiency (BE) and allowing for flush mounting. Achievements include a broadside gain exceeding 26 dBi and radiation and beam efficiencies above 75% and 88%, respectively, with SLLs below -25 dB.Further, the dissertation presents a 3-D printed wideband, multibeam array with an inhomogeneous lens operating from 36 to 90 GHz. This design consists of five double-ridge horn (DRH) antennas, an absorber-lined ring, a structural spacer, and a shielding cover. Integrating an annular ring-shaped structure with a current sheet absorber notably improves gain and SLL, while the shielding cover reduces electromagnetic interference/compatibility (EMI/EMC) risks. Employing digital light processing (DLP) 3-D printing technology enables prototype fabrication while maintaining tight tolerances. Performance metrics include gains of over 12 dBi for five feeds and a radiation efficiency above 62% at the high frequency end, with SLLs below -12 dB and minimal scan loss (< 0.5 dB).Finally, the thesis showcases a compact unit-cell design for a circularly polarized microstrip patch array. The unit-cell consists of four sequentially rotated microstrip patch elements with chamfered corners and a cross-slot mounted on a single substrate. This configuration results in a compact size and broadens the axial ratio (AR) and impedance bandwidths. The closely placed elements induce strong mutual coupling. The design methodology and its feasibility are substantiated with a 2x2 finite array prototype featuring integrated series power dividers. Experimental results demonstrate symmetric radiation patterns with a VSWR under 2:1 and a 1dB AR bandwidth over a 56% range, validating the design's application potential in various RF scenarios.
546 $a English
590 $a School code: 0051
650 4 $a Electromagnetics. $3 3173223
650 4 $a Electrical engineering. $3 649834
650 4 $a Engineering. $3 586835
650 4 $a Computer science. $3 523869
653 $a Additive manufacturing
653 $a Highly directional
653 $a Horn antennas
653 $a Lens
653 $a Phased array
653 $a Wideband
690 $a 0607
690 $a 0544
690 $a 0984
690 $a 0537
710 2 $a University of Colorado at Boulder. $b Electrical Engineering. $e degree granting institution. $3 3816084
720 1 $a Filipović, Dejan S. $e degree supervisor.
773 0 $t Dissertations Abstracts International $g 86-03B.
790 $a 0051
791 $a Ph.D.
792 $a 2024
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31486545