[天线]Dual Band Quadrifilar Helix Antennas

This paper details antenna design work on quadrifilar X.[8L^ldh  
helices that can be applied to antennas for small satconi iHlee=}od  
terminals (on boats and vehicles), for GPS Esdw^MGL2  
applications, and in the space segment for <8BNqbX  
communications monitoring and data down links. E{]PfUfFY  
During the development of the Antennas for the D|g{]nO  
METOP Programme for ESA it was necessary to  J7p?9  
produce a design of antenna to operate over three ?b xak  
frequency bands concurrently. These were centred on 495A\8#  
the VAJ .. b_']S0
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A 1B_EX.  

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