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Circularly Polarized Antennas for GN...

Hussine, Umniyyah Ulfa,

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Circularly Polarized Antennas for GNSS Applications /

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Circularly Polarized Antennas for GNSS Applications // Umniyyah Ulfa Hussine.
作者:	Hussine, Umniyyah Ulfa,
面頁冊數:	1 electronic resource (182 pages)
附註:	Source: Dissertations Abstracts International, Volume: 82-10, Section: B.
Contained By:	Dissertations Abstracts International82-10B.
標題:	Receivers & amplifiers. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28403723
ISBN:	9798728215318

Circularly Polarized Antennas for GNSS Applications /
Hussine, Umniyyah Ulfa,

Circularly Polarized Antennas for GNSS Applications /Umniyyah Ulfa Hussine. - 1 electronic resource (182 pages)

Source: Dissertations Abstracts International, Volume: 82-10, Section: B.

Global navigation satellite system (GNSS) is developing rapidly. Modern GNSS technology is facing challenges for researchers to explore. One hot topic is the multisystem GNSS device. The motivation for the antenna designers is to miniaturize the size of the antenna and meanwhile keep its standard performance. It is a challenging task for an antenna array design to achieve a wide bandwidth, high gain, small size, good coverage, and simple fabrication technique all at the same time. This thesis develops several different novel compacts, high gain, and wide bandwidth circularly polarized (CP) antenna capable of providing wide coverage for GNSS frequency bands from 1.16 GHz to 1.6 GHz to cover the GPS L1-L5 bands, GLONASS G1, G2 and G3 as well as the Galileo E5a, E5b, E6, and E1bands. In the first part of the thesis, the author proposed a new broadband antenna to cover the GPS L1-L5 bands, GLONASS G1, G2 and G3 as well as the Galileo E5a, E5b, E6, and E1bands. The antenna is composed of four parasitic elements that are excited by coupling with the elliptical crossed dipole in the center. By adjusting the size of the parasitic element and the edge of the dipoles, the coupling strength can be optimized. The antenna employs a single feed and two orthogonally elliptical printed dipoles. The dipoles are crossed through a 90° phase delay line of a vacant-quarter printed ring to achieve CP radiation. The main problem of an antenna equipped with a metallic reflector is often addressed by including a quarter-wavelength space between the radiating elements and the reflector to obtain optimal antenna characteristics. These can be circumvented by using an artificial magnetic conductor (AMC) surface instead of a metallic reflector. The second contribution is the development of two novel broadband antennas using two different material of AMC substrate which is FR-4 and Rogers RT6006. By combining the crossed dipole radiators and the finite AMC surfaces, low-profile multiband CP antennas that are nearly completely matched to a single 50 Ω source and have high radiation efficiencies have been implemented. The proposed antenna has a 10-dB return loss over 1.153 - 2.36 GHz and achieves a peak realized gain of 5.86 dBi. The interesting features of the AMC-based crossed dipole antennas are not only their ability to achieve high efficiency with a low profile but also to generate additional resonances and the corresponding additional CP radiation features. These were utilized to add other operating bands or to broaden the antenna bandwidth. Jamming is the act of intentionally directing electromagnetic energy towards a communication and navigation system to disrupt or prevent signal transmission. GNSS jammers broadcast their interference signal in the frequency band used for satellite navigation. Consequently, the final contribution of the work is a novel wideband CP antijamming antenna array with the capability of generating multiple steerable beam directions and enables effective jammer suppression with negligible phase distortion. A 2 x 2 antenna array exhibits a wide bandwidth from 0.995-2.333 GHz and has a peak gain of 7.6 dBi. In order to have a compact system, a total antenna array miniaturization has been achieved. Collectively, these contributions advance the state-of-the-art in GNSS adaptive antennas in terms of performance, precision, and practicality.

English

ISBN: 9798728215318Subjects--Topical Terms:

3559205
Receivers & amplifiers.
Subjects--Index Terms:

Global navigation satellite systems

Circularly Polarized Antennas for GNSS Applications /
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520 $a Global navigation satellite system (GNSS) is developing rapidly. Modern GNSS technology is facing challenges for researchers to explore. One hot topic is the multisystem GNSS device. The motivation for the antenna designers is to miniaturize the size of the antenna and meanwhile keep its standard performance. It is a challenging task for an antenna array design to achieve a wide bandwidth, high gain, small size, good coverage, and simple fabrication technique all at the same time. This thesis develops several different novel compacts, high gain, and wide bandwidth circularly polarized (CP) antenna capable of providing wide coverage for GNSS frequency bands from 1.16 GHz to 1.6 GHz to cover the GPS L1-L5 bands, GLONASS G1, G2 and G3 as well as the Galileo E5a, E5b, E6, and E1bands. In the first part of the thesis, the author proposed a new broadband antenna to cover the GPS L1-L5 bands, GLONASS G1, G2 and G3 as well as the Galileo E5a, E5b, E6, and E1bands. The antenna is composed of four parasitic elements that are excited by coupling with the elliptical crossed dipole in the center. By adjusting the size of the parasitic element and the edge of the dipoles, the coupling strength can be optimized. The antenna employs a single feed and two orthogonally elliptical printed dipoles. The dipoles are crossed through a 90° phase delay line of a vacant-quarter printed ring to achieve CP radiation. The main problem of an antenna equipped with a metallic reflector is often addressed by including a quarter-wavelength space between the radiating elements and the reflector to obtain optimal antenna characteristics. These can be circumvented by using an artificial magnetic conductor (AMC) surface instead of a metallic reflector. The second contribution is the development of two novel broadband antennas using two different material of AMC substrate which is FR-4 and Rogers RT6006. By combining the crossed dipole radiators and the finite AMC surfaces, low-profile multiband CP antennas that are nearly completely matched to a single 50 Ω source and have high radiation efficiencies have been implemented. The proposed antenna has a 10-dB return loss over 1.153 - 2.36 GHz and achieves a peak realized gain of 5.86 dBi. The interesting features of the AMC-based crossed dipole antennas are not only their ability to achieve high efficiency with a low profile but also to generate additional resonances and the corresponding additional CP radiation features. These were utilized to add other operating bands or to broaden the antenna bandwidth. Jamming is the act of intentionally directing electromagnetic energy towards a communication and navigation system to disrupt or prevent signal transmission. GNSS jammers broadcast their interference signal in the frequency band used for satellite navigation. Consequently, the final contribution of the work is a novel wideband CP antijamming antenna array with the capability of generating multiple steerable beam directions and enables effective jammer suppression with negligible phase distortion. A 2 x 2 antenna array exhibits a wide bandwidth from 0.995-2.333 GHz and has a peak gain of 7.6 dBi. In order to have a compact system, a total antenna array miniaturization has been achieved. Collectively, these contributions advance the state-of-the-art in GNSS adaptive antennas in terms of performance, precision, and practicality.
546 $a English
590 $a School code: 0722
650 4 $a Receivers & amplifiers. $3 3559205
650 4 $a Satellite communications. $3 3694420
650 4 $a Antennas. $3 3681648
650 4 $a Aerospace engineering. $3 1002622
650 4 $a Electrical engineering. $3 649834
653 $a Global navigation satellite systems
653 $a Broadband antenna
653 $a Antenna arrays
690 $a 0544
690 $a 0538
710 2 $a The University of Liverpool (United Kingdom). $e degree granting institution. $3 3767499
720 1 $a Huang, Yi $e degree supervisor.
773 0 $t Dissertations Abstracts International $g 82-10B.
790 $a 0722
791 $a Ph.D.
792 $a 2021
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28403723