| With the development of satellite navigation technology, satellite navigation industry becomesthe world’s fastest increasing information industry after the mobile communication and the internetin recent years. Many countries and organizations are actively developing their own satellitenavigation systems, for example the U.S. GPS, the Russian GLONASS, the EU Galileo system andthe China Compass system. In order to improve the user’s positioning accuracy and freedom fromthe constraints of a single system, multiple systems coexisting and multi-mode compatible satellitenavigation terminal is the research direction in the future. Terminal antenna is one of the mostimportant parts of satellite navigation system, and it has a very important influence on theperformance of the satellite navigation system. Therefore, it is necessary to study on multi-modesatellite navigation terminal antenna which can receive multiple satellite signals.This paper introduces the radiation theory and analysis method of microstrip antenna, and itmainly studies the broadband technology and circular polarization technology of microstrip antenna.With the help of the electromagnetic simulation software HFSS, four terminal antennas for satellitenavigation system are designed.1. A single-feed dual-band GPS antenna by stacking two different corner-truncated squarepatches is presented. And it uses high permittivity ceramic dielectric substrate to obtainminiaturization. The simulation results show that, the bandwidth for the L1(1575.42MHz) and L2(1227.6MHz) bands are20MHz and15MHz, respectively, and the axis ratio is smaller than3-dB atthe work frequency.2. A new broadband circularly polarized mircostrip antenna is designed by changing thestructures of microstrip feed-line and the perturbation units. The simulation and measured resultsshow that the impedance bandwidth with S11<-10dB is195MHz (1465-1660MHz), and the axialratio is less than2dB in the band. So it can be used to receive the Compass B1(1561.098MHz),GPS L1(1575.42MHz) and GLONASS L1(1602.56-1615.50MHz) band signals.3. Changing the geometry of the above antenna, a new wideband circularly polarizedmircostrip antenna is obtained. The simulation and measured results show that, the impedancebandwidth and3-dB axis ratio bandwidth can be effectively expanded, and they cover the workingband of GPS, GLONASS, Galileo and Compass. So the proposed antenna can be used as four-modesatellite navigation receiving antenna. The antenna is easy to produce because of its simple structureand low profile.4. A new four-mode satellite navigation terminal antenna with two-feed network is proposed. By introducing air layer, parasitic patch and adopting stacked structure, the impedance bandwidth isenlarged effectively. With the help of two-feed network, the antenna obtains a broadband circularpolarization. The simulation results show that the antenna has a high gain, and it also can be used asfour-mode satellite navigation receiving antenna. |
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