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Dielectric Resonator Antenna and Array Concepts based on Glass, Ceramics and Glass-ceramics

Mehmood, Arshad (2018):
Dielectric Resonator Antenna and Array Concepts based on Glass, Ceramics and Glass-ceramics.
Darmstadt, Technische Universität, [Online-Edition: http://tuprints.ulb.tu-darmstadt.de/7503],
[Ph.D. Thesis]

Abstract

The focus of this work has been the exploration of different concepts of the dielectric resonator antennas. Mainly, a new kind of glass-ceramic material was characterized and used for making different dielectric loaded or dielectric resonator antennas and corresponding arrays based on such radiating elements. The measurements were carried out on different glass-ceramic compositions and showed a permittivity ranging from 21 to 38 with Qf product in the range from 1500 to 10000 GHz. Patch antennas for the GPS band using glass-ceramic loading were successfully fabricated and tested. The transparent property of the non-ceramized glass was used for making transparent antennas in combination with a solar-cell module for future energy-autonomous units. Its functionality was demonstrated with a measured gain of 4 dB. Another novel concept of tilted beam dielectric resonator antenna was also successfully tested. The beam was measured to be tilted at 30◦ from the broadside. The prototype was manufactured by using commonly available alumina substrate material and cutting it with laser, thus providing an easy fabrication method. The tilted dielectric resonator antenna element has also been used to fabricate fixed beam arrays at 0◦, 30◦ and 60◦ beams. This proved the concept of using the tilted beam dielectric resonator antennas for better lower elevation angle coverage. Another major part of the work was concerned with realizing the phased arrays with dielectric resonator antennas as radiating elements. Two phased array demonstrators were fabricated in 1 × 4 configuration. One of the array consisted of liquid crystal based delay lines in inverted microstrip technology. It was fabricated with 10 GHz target frequency and successfully showed steering of the beams in −25◦ and +25◦. The second array was based on Barium Strontium Titanate phase shifters in the metal-insulator-metal configuration. This array used stacked dielectric resonator antennas for a wide bandwidth at center frequency of 8 GHz and showed beam steering of −30◦ and +30◦.

Item Type: Ph.D. Thesis
Erschienen: 2018
Creators: Mehmood, Arshad
Title: Dielectric Resonator Antenna and Array Concepts based on Glass, Ceramics and Glass-ceramics
Language: English
Abstract:

The focus of this work has been the exploration of different concepts of the dielectric resonator antennas. Mainly, a new kind of glass-ceramic material was characterized and used for making different dielectric loaded or dielectric resonator antennas and corresponding arrays based on such radiating elements. The measurements were carried out on different glass-ceramic compositions and showed a permittivity ranging from 21 to 38 with Qf product in the range from 1500 to 10000 GHz. Patch antennas for the GPS band using glass-ceramic loading were successfully fabricated and tested. The transparent property of the non-ceramized glass was used for making transparent antennas in combination with a solar-cell module for future energy-autonomous units. Its functionality was demonstrated with a measured gain of 4 dB. Another novel concept of tilted beam dielectric resonator antenna was also successfully tested. The beam was measured to be tilted at 30◦ from the broadside. The prototype was manufactured by using commonly available alumina substrate material and cutting it with laser, thus providing an easy fabrication method. The tilted dielectric resonator antenna element has also been used to fabricate fixed beam arrays at 0◦, 30◦ and 60◦ beams. This proved the concept of using the tilted beam dielectric resonator antennas for better lower elevation angle coverage. Another major part of the work was concerned with realizing the phased arrays with dielectric resonator antennas as radiating elements. Two phased array demonstrators were fabricated in 1 × 4 configuration. One of the array consisted of liquid crystal based delay lines in inverted microstrip technology. It was fabricated with 10 GHz target frequency and successfully showed steering of the beams in −25◦ and +25◦. The second array was based on Barium Strontium Titanate phase shifters in the metal-insulator-metal configuration. This array used stacked dielectric resonator antennas for a wide bandwidth at center frequency of 8 GHz and showed beam steering of −30◦ and +30◦.

Place of Publication: Darmstadt
Divisions: 18 Department of Electrical Engineering and Information Technology
18 Department of Electrical Engineering and Information Technology > Institute for Microwave Engineering and Photonics > Microwave Engineering
18 Department of Electrical Engineering and Information Technology > Institute for Microwave Engineering and Photonics
Date Deposited: 24 Jun 2018 19:55
Official URL: http://tuprints.ulb.tu-darmstadt.de/7503
URN: urn:nbn:de:tuda-tuprints-75034
Referees: Jakoby, Prof. Rolf and Solbach, Prof. Klaus
Refereed / Verteidigung / mdl. Prüfung: 23 June 2017
Alternative Abstract:
Alternative abstract Language
Der Fokus der vorliegenden Arbeit liegt auf der Untersuchung verschiedener Konzepte für dielektrische Resonatorantennen. In erster Linie wurde dazu eine neueartige Glaskeramik charakterisiert und zur Herstellung unterschiedlicher dielektrisch belasteter Antennen bzw. dielektischer Resonator-Antennen genutzt und zu Arrays verbaut. Die Messungen wurden an verschiedenen Zusammensetzungen der Glaskeramik durchgef¨uhrt und lieferten Permittivitäten im Bereich von 21 bis 38 bei einem Qf Produkt im Bereich von 1500 bis 10 000 GHz. Patchantennen auf Basis der Glaskeramiken wurden für das GPS-Band entworfen, aufgebaut und getestet. Die nicht-keramischen Gläser wurden aufgrund ihrer Lichtdurchlässigkeit zur Herstellung transparenter Antennen zusammen mit Solarzellen genutzt, was in Zukunft kombinierte Module für energieautonome Systeme ermöglicht. Ihre Funktion wurde anhand eines Moduls mit 4 dB Gewinn demonstriert. Ein weiteres neuartiges Konzept, eine dielektrische Resonatorantenne mit einem gegenüber Broadside um 30◦ geneigten Strahl (tilted beam) wurde ebenfalls erfolgreich vermessen. Der Prototyp wurde auf handelsüblichem Aluminasubstrat hergestellt und mit Laser zugeschnitten, so dass eine einfache Herstellung sichergestellt ist. Mit dem Konzept der geneigten dielektrischen Resonatorantenne wurden statische Arrays mit Strahlrichtung von 0◦, 30◦ und 60◦ hergestellt. Damit konnte gezeigt werden, dass geneigte dielektrische Resonatorantennen geeignet sind, um niedrige Elevationswinkel besser abzudecken. Ein weiterer wesentlicher Teil der vorliegenden Arbeit beschäftigt sich mit der Realisierung von phasengesteuerten Gruppenantennen mit dielektrischen Resonatoren als Einzelelemente. Zwei Antennendemonstratoren in 1 × 4-Konfiguration wurden aufgebaut. Der erste basiert auf flüssigkristallbasierten Verzögerungsleitungen in invertierter Mikrostreifenleitungstopologie. Er wurde für den Betrieb bei 10 GHz entworfen und demonstrierte einen Strahlschwenk von −25◦ bis 25◦. Der zweite basiert auf Barium-Strontium-Titanat-Phasenschiebern in Metall-Isolator-Metall-Konfiguration. Er nutzt gestapelte dielektrische Resonatorantennen, um eine hohe Bandbreite um die Mittenfrequenz von 8 GHz und einen Strahlschwenk von −30◦ bis 30◦ zu erzielen.German
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