Laser-assisted manufacture for performance-optimized dielectrically loaded GPS antennas for mobile telephones

Leisten, Oliver; Fieret, Jim; Stassen Böhlen, Ines; Rumsby, Phil T.; McEvoy, Patrick; Vardaxoglou, Yiannis

doi:10.1117/12.470647

Publication type:	Conference paper
Type of review:	Not specified
Title:	Laser-assisted manufacture for performance-optimized dielectrically loaded GPS antennas for mobile telephones
Authors:	Leisten, Oliver Fieret, Jim Stassen Böhlen, Ines Rumsby, Phil T. McEvoy, Patrick Vardaxoglou, Yiannis
DOI:	10.1117/12.470647
Published in:	Proceedings / SPIE
Proceedings:	Photon Processing in Microelectronics and Photonics
Volume(Issue):	4637
Page(s):	397
Pages to:	404
Conference details:	High-Power Lasers and Applications, San Jose, United States, 20-25 January 2002
Issue Date:	2002
Publisher / Ed. Institution:	International society for optical engineering
ISSN:	0277-786X
Language:	English
Subjects:	Excimer laser; Nd:YAG laser; Trimming; Resist exposure
Subject (DDC):	621.3: Electrical, communications, control engineering
Abstract:	The use of ceramic cores of high dielectric constant is an essential part of a strategy to miniaturize GPS antennas for mobile telephones. The core reduces the guide wavelength of the conducting structures on the antenna, thereby creating a need for high-resolution imaging to maintain very accurate dimensions. It is for this principal reason that a novel laser imaging technology has been developed using a positive electrophoretic photoresist and UV excimer laser mask imaging to produce the conducting features on the surface of the antenna. Furthermore, a significant process challenge in producing this type of antenna concerns the reproducibility of the right-hand circular polarization performance and the bandwidth over which this can be achieved - which becomes progressively smaller as antenna size is reduce. It is therefore a vital requirement that the antennas have the point to be tuned by a laser trimming process at an automatic RF testing station. A galvanometer controlled Nd:YAG laser spot is used to trim the conductive pattern on the top of the antenna following an RF measurement to characterize the resonant frequencies of the four helical conductors. Results demonstrate the laser imaging and trimming techniques ensure a high-speed method of guaranteeing the antenna performance. The technique is appropriate for other antenna types such as GSM, Bluetooth and Wireless LAN.
URI:	https://digitalcollection.zhaw.ch/handle/11475/16449
Fulltext version:	Published version
License (according to publishing contract):	Licence according to publishing contract
Departement:	School of Engineering
Organisational Unit:	Institute of Applied Mathematics and Physics (IAMP)
Appears in collections:	Publikationen School of Engineering

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Leisten, O., Fieret, J., Stassen Böhlen, I., Rumsby, P. T., McEvoy, P., & Vardaxoglou, Y. (2002). Laser-assisted manufacture for performance-optimized dielectrically loaded GPS antennas for mobile telephones [Conference paper]. Proceedings / SPIE, 4637, 397–404. https://doi.org/10.1117/12.470647

Leisten, O. et al. (2002) ‘Laser-assisted manufacture for performance-optimized dielectrically loaded GPS antennas for mobile telephones’, in Proceedings / SPIE. International society for optical engineering, pp. 397–404. Available at: https://doi.org/10.1117/12.470647.

O. Leisten, J. Fieret, I. Stassen Böhlen, P. T. Rumsby, P. McEvoy, and Y. Vardaxoglou, “Laser-assisted manufacture for performance-optimized dielectrically loaded GPS antennas for mobile telephones,” in Proceedings / SPIE, 2002, vol. 4637, pp. 397–404. doi: 10.1117/12.470647.

LEISTEN, Oliver, Jim FIERET, Ines STASSEN BÖHLEN, Phil T. RUMSBY, Patrick MCEVOY und Yiannis VARDAXOGLOU, 2002. Laser-assisted manufacture for performance-optimized dielectrically loaded GPS antennas for mobile telephones. In: Proceedings / SPIE. Conference paper. International society for optical engineering. 2002. S. 397–404

Leisten, Oliver, Jim Fieret, Ines Stassen Böhlen, Phil T. Rumsby, Patrick McEvoy, and Yiannis Vardaxoglou. 2002. “Laser-Assisted Manufacture for Performance-Optimized Dielectrically Loaded GPS Antennas for Mobile Telephones.” Conference paper. In Proceedings / SPIE, 4637:397–404. International society for optical engineering. https://doi.org/10.1117/12.470647.

Leisten, Oliver, et al. “Laser-Assisted Manufacture for Performance-Optimized Dielectrically Loaded GPS Antennas for Mobile Telephones.” Proceedings / SPIE, vol. 4637, International society for optical engineering, 2002, pp. 397–404, https://doi.org/10.1117/12.470647.