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

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

doi:10.1117/12.470647

18 June 2002 Laser-assisted manufacture for performance-optimized dielectrically loaded GPS antennas for mobile telephones

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

Author Affiliations +

Proceedings Volume 4637, Photon Processing in Microelectronics and Photonics; (2002) https://doi.org/10.1117/12.470647
Event: High-Power Lasers and Applications, 2002, San Jose, California, United States

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.

Citation Download Citation

Oliver Leisten, Jim Fieret, Ines Stassen Boehlen, Phil T. Rumsby, Patrick McEvoy, and Yiannis Vardaxoglou "Laser-assisted manufacture for performance-optimized dielectrically loaded GPS antennas for mobile telephones", Proc. SPIE 4637, Photon Processing in Microelectronics and Photonics, (18 June 2002); https://doi.org/10.1117/12.470647

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