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首页> 外文会议>Conference on Photon Processing in Microelectronics and Photonics Jan 21-24, 2002 San Jose, USA >Laser Assisted Manufacture for Performance Optimised, Dielectrically Loaded GPS Antennas for Mobile Telephones
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Laser Assisted Manufacture for Performance Optimised, Dielectrically Loaded GPS Antennas for Mobile Telephones

机译：激光辅助制造，用于性能优化的移动电话用电介质GPS天线

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摘要

The use of ceramic cores of high dielectric constant is an essential part of a strategy to miniaturise 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 polarisation performance and the bandwidth over which this can be achieved - which becomes progressively smaller as antenna size is reduced. It is therefore a vital requirement that the antennas have the option 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 characterise 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.
机译：使用高介电常数的陶瓷芯是使移动电话GPS天线小型化的策略的重要组成部分。纤芯减小了天线上导电结构的引导波长，从而产生了对高分辨率成像的需求，以保持非常精确的尺寸。出于这个主要原因，已经开发出一种新颖的激光成像技术，该技术使用正电泳光刻胶和UV受激准分子激光掩模成像在天线表面上产生导电特征。此外，生产这种类型天线的重大工艺挑战涉及右旋圆极化性能的可再现性以及可实现该性能的带宽，随着天线尺寸的减小，带宽逐渐减小。因此，至关重要的要求是天线必须具有在自动RF测试站通过激光微调过程进行调谐的选项。检流计控制的Nd：YAG激光点用于在RF测量之后修整天线顶部的导电图案，以表征四个螺旋导体的谐振频率。结果表明，激光成像和微调技术可确保保证天线性能的高速方法。该技术适用于其他天线类型，例如GSM，蓝牙和无线LAN。

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