[天线]73 THE NORMAL MODE SPHERICAL HELICAL ANTENNA FOR MOBILE COMMUNICATIONS

THE NORMAL MODE SPHERICAL HELICAL ANTENNA FOR MOBILE COMMUNICATIONS 8C2!Wwz`J8  
H. T. HUI and K. Y. Chan a4N8zDS  
Wireless Communications Centre, City University of Hong Kong, Hong Kong R= *vPS  
E-mail: eehthui@cityu.edu.hk )F:UkS  
EDWARD K. N. YUNG [ ]=}0l
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Electronic Engineering Department, City University of Hong Kong, Hong Kong H$]FUv8  
E-mail: eeedyung@cityu.edu.hk YQ5d!a.  
A small spherical helical antenna operating in the normal mode is investigated. It is found that it can uB35CRd  
undergo a strong resonance around 900 MHz. The impedance level is very high near the resonant }pv<<7}|  
frequency. The radiation patterns are similar to those of the normal mode cylindrical helical antenna.
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