Miniaturization of multi-arm multi-mode spiral antennas for GPS applications

点击翻译按钮获取中文摘要

The Global Positioning System, GPS, is used in many applications for surveying, location identification, navigation, vehicular speed calculations, mapping and other novel devices. There seems to be no limit in its utilization, and new applications become implemented or proposed regularly. One of the reasons for its popularity is the availability of GPS signals for common use and ease of use. However, in most applications the receiving device is mobile or is in an unattended location that requires low energy consumption and longer battery life. The system must also be low cost, which excludes large and sophisticated electronics for signal processing, and interference mitigation. These conflicting requirements discourage the use of active devices and transfer some of the signal processing to passive components, especially antennas. Antenna arrays can reduce or overcome interference problems, but require larger space for implementation. One of the critical challenges in design of the next generation advanced GPS systems is in developing reduced-size low cost antenna arrays with enhanced performance.