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Design of Printed Array Antennas for Wireless Communications /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Design of Printed Array Antennas for Wireless Communications // Wenting Li.
Author:	Li, Wenting,
Description:	1 electronic resource (175 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 80-10, Section: B.
Contained By:	Dissertations Abstracts International80-10B.
Subject:	Wireless communications. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13873414
ISBN:	9798790674983

Design of Printed Array Antennas for Wireless Communications /
Li, Wenting,

Design of Printed Array Antennas for Wireless Communications /Wenting Li. - 1 electronic resource (175 pages)

Source: Dissertations Abstracts International, Volume: 80-10, Section: B.

Compared to parabolic reflector antennas, printed array antennas have compact size, light weight and low cost. Many printed array antennas have been reported in the literature, but there are lots of challenges remaining. For example, how to achieve polarization-reconfigurable circularly polarized (CP) array antennas? How to reduce the thickness of folded reflectarray CP antennas? How to increase the bandwidth of reflectarray antennas? How to achieve multi-beam radiation? To tackle these challenges, several novel designs of printed array antennas are proposed in this dissertation.First, a novel design of a polarization-reconfigurable CP antenna is proposed. It is the first time an electronically polarization-reconfigurable CP antenna with a single-substrate polarizer is reported. The antenna consists of a slot antenna and an electronically polarization-reconfigurable polarizer (EPRP), which could convert the linearly polarized (LP) waves from the slot antenna to CP waves. The polarization of the antenna could be electronically switched to left-hand circular polarization (LHCP) or right-hand circular polarization (RHCP) by changing the states of the positive-intrinsic-negative (PIN) diodes that are loaded on the polarizer. There are several features of applying an EPRP in this design. 1) The DC circuit of PIN diodes is completely isolated from the RF signals. 2) The PIN diodes are not mounted on the RF feed network. 3) In this antenna, 32 PIN diodes are mounted on the EPRP. The average current of each PIN diode is quite small. Therefore, the antenna can radiate more power without damaging the diodes. 4) The gain of antennas is improved as the aperture of the slot antenna is enlarged by the EPRP.Then, a novel folded CP reflectarray with a significantly-reduced antenna thickness is designed. The antenna consists of a CP feed antenna, a reflecting surface and a circular polarization selective surface (CPSS). The CPSS is transparent for RHCP waves and reflects LHCP waves. By applying the CPSS as the polarization grid for CP waves, the thickness of the CP reflectarray antenna is reduced significantly. It is the first time that the CPSS is applied as the polarization grid in a folded CP reflectarray antenna.To overcome the problem of narrow bandwidth of reflectarrays, one ultra-wide-band tightly coupled dipole reflectarray (TCDR) antenna is proposed. This is the first report of a reflectarray using the concept of tightly coupled elements, and the reflectarray antenna is shown to achieve much wider working bandwidth compared with all the reflectarray antennas that are reported in the previous literature. The reflectarray consist of a wide-band feed antenna and a wide-band reflecting surface. The proposed antenna combines the features of tightly coupled arrays and those of reflectarrays. As a result, the TCDR antenna has an ultra-wide bandwidth, and a much simpler feed network compared with tightly coupled arrays and other ultra-wide-band direct radiation array. A novel method to mini-mize the phase errors of the wideband reflectarray is also proposed. In its operating frequency band, the TCDR antenna has stable main beams and reasonable side lobe levels (SLL). A new method of improving the polarization purity of the TCDR antenna is also proposed. Based on the method, two reflectarray antennas are designed and simulated. The simulated results show that the proposed method could reduce the cross-polarization of the TCDR antenna significantly.Finally, a novel method of designing a Nolen matrix is proposed, and the derivation of the method is given as well. The method is more concise compared with that reported in the previous literature. Based on this method, a multi-beam antenna fed by a 5x5 Nolen matrix network is proposed. The multi-beam antenna is simulated, fabricated and measured. The simulated and measured results prove the effectiveness of the proposed method of designing a Nolen matrix.In this thesis, in order to accurately evaluate the performance of the proposed antennas, full-wave electromagnetic simulations are carried out by using commercial tools such as High Frequency Structure Simulator and Computer Simulation Technology Microwave Studio. Prototypes of the antenna designs are fabricated and measured. The simulated and measured results agree well.

English

ISBN: 9798790674983Subjects--Topical Terms:

3554231
Wireless communications.

Design of Printed Array Antennas for Wireless Communications /
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245 1 0 $a Design of Printed Array Antennas for Wireless Communications / $c Wenting Li.
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500 $a Source: Dissertations Abstracts International, Volume: 80-10, Section: B.
500 $a Advisors: Gao, Steven.
502 $b Ph.D. $c University of Kent (United Kingdom) $d 2018.
520 $a Compared to parabolic reflector antennas, printed array antennas have compact size, light weight and low cost. Many printed array antennas have been reported in the literature, but there are lots of challenges remaining. For example, how to achieve polarization-reconfigurable circularly polarized (CP) array antennas? How to reduce the thickness of folded reflectarray CP antennas? How to increase the bandwidth of reflectarray antennas? How to achieve multi-beam radiation? To tackle these challenges, several novel designs of printed array antennas are proposed in this dissertation.First, a novel design of a polarization-reconfigurable CP antenna is proposed. It is the first time an electronically polarization-reconfigurable CP antenna with a single-substrate polarizer is reported. The antenna consists of a slot antenna and an electronically polarization-reconfigurable polarizer (EPRP), which could convert the linearly polarized (LP) waves from the slot antenna to CP waves. The polarization of the antenna could be electronically switched to left-hand circular polarization (LHCP) or right-hand circular polarization (RHCP) by changing the states of the positive-intrinsic-negative (PIN) diodes that are loaded on the polarizer. There are several features of applying an EPRP in this design. 1) The DC circuit of PIN diodes is completely isolated from the RF signals. 2) The PIN diodes are not mounted on the RF feed network. 3) In this antenna, 32 PIN diodes are mounted on the EPRP. The average current of each PIN diode is quite small. Therefore, the antenna can radiate more power without damaging the diodes. 4) The gain of antennas is improved as the aperture of the slot antenna is enlarged by the EPRP.Then, a novel folded CP reflectarray with a significantly-reduced antenna thickness is designed. The antenna consists of a CP feed antenna, a reflecting surface and a circular polarization selective surface (CPSS). The CPSS is transparent for RHCP waves and reflects LHCP waves. By applying the CPSS as the polarization grid for CP waves, the thickness of the CP reflectarray antenna is reduced significantly. It is the first time that the CPSS is applied as the polarization grid in a folded CP reflectarray antenna.To overcome the problem of narrow bandwidth of reflectarrays, one ultra-wide-band tightly coupled dipole reflectarray (TCDR) antenna is proposed. This is the first report of a reflectarray using the concept of tightly coupled elements, and the reflectarray antenna is shown to achieve much wider working bandwidth compared with all the reflectarray antennas that are reported in the previous literature. The reflectarray consist of a wide-band feed antenna and a wide-band reflecting surface. The proposed antenna combines the features of tightly coupled arrays and those of reflectarrays. As a result, the TCDR antenna has an ultra-wide bandwidth, and a much simpler feed network compared with tightly coupled arrays and other ultra-wide-band direct radiation array. A novel method to mini-mize the phase errors of the wideband reflectarray is also proposed. In its operating frequency band, the TCDR antenna has stable main beams and reasonable side lobe levels (SLL). A new method of improving the polarization purity of the TCDR antenna is also proposed. Based on the method, two reflectarray antennas are designed and simulated. The simulated results show that the proposed method could reduce the cross-polarization of the TCDR antenna significantly.Finally, a novel method of designing a Nolen matrix is proposed, and the derivation of the method is given as well. The method is more concise compared with that reported in the previous literature. Based on this method, a multi-beam antenna fed by a 5x5 Nolen matrix network is proposed. The multi-beam antenna is simulated, fabricated and measured. The simulated and measured results prove the effectiveness of the proposed method of designing a Nolen matrix.In this thesis, in order to accurately evaluate the performance of the proposed antennas, full-wave electromagnetic simulations are carried out by using commercial tools such as High Frequency Structure Simulator and Computer Simulation Technology Microwave Studio. Prototypes of the antenna designs are fabricated and measured. The simulated and measured results agree well.
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650 4 $a Wireless communications. $3 3554231
650 4 $a Wireless networks. $3 1531264
650 4 $a Diodes. $3 673996
650 4 $a Satellite communications. $3 3694420
650 4 $a Signal to noise ratio. $3 3681178
650 4 $a Bandwidths. $3 3560998
650 4 $a Electric fields. $3 880423
650 4 $a Antennas. $3 3681648
650 4 $a Computer simulation. $3 525602
650 4 $a Design. $3 518875
650 4 $a Communications systems. $3 3680625
650 4 $a Aperture. $3 3682378
650 4 $a Radiation. $3 673904
650 4 $a Aerospace engineering. $3 1002622
650 4 $a Electrical engineering. $3 649834
650 4 $a Engineering. $3 586835
650 4 $a Optics. $3 517925
650 4 $a Physics. $3 516296
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690 $a 0544
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710 2 $a University of Kent (United Kingdom). $e degree granting institution. $3 3767445
720 1 $a Gao, Steven $e degree supervisor.
773 0 $t Dissertations Abstracts International $g 80-10B.
790 $a 5021
791 $a Ph.D.
792 $a 2018
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