[天线]Dual Band Quadrifilar Helix Antennas

This paper details antenna design work on quadrifilar !f)'+
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helices that can be applied to antennas for small satconi 6#N1 -@  
terminals (on boats and vehicles), for GPS )_+"  
applications, and in the space segment for Y8.0R-:ZAN  
communications monitoring and data down links. ZT8. r0  
During the development of the Antennas for the <S $Z  
METOP Programme for ESA it was necessary to PNT.9 *d  
produce a design of antenna to operate over three =%Ut&6}sQ  
frequency bands concurrently. These were centred on '7>Vmr6  
the VAJ .. <WaiJy?  
wX#\\Jgi  

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