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Chapter 5: Multimode and Advanced Termin... > 5.1 Multiband Terminal Antennas

5.1 Multiband Terminal Antennas

With the development of satellite navigation technology, many countries have started to build their own satellite navigation systems. Nowadays, these systems are used intensively. The American GPS and the Russian GLONASS are already operating worldwide. The Chinese Compass system has also provided a partial service. Future satellite navigation receivers will provide multimode operation utilising different satellite navigation systems to improve their positioning accuracy and reliability, so the design of terminal antennas for multimode satellite navigation systems is practically desirable.

A multimode satellite navigation receiver is required to cover several frequency bands for the GPS, GLONASS, Galileo and Compass systems, as detailed in Table 1.1. Each GNSS has several frequency bands. The challenges in the design of a multiband receiver antenna come from two requirements: the antenna needs to provide right hand circular polarisation with a low axial ratio and also maintain a low VSWR over multiple frequency bands. In this chapter several designs of dual-band and triple-band GNSS antennas are discussed.


  

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