[天线]DUAL-FREQUENCY OPERATION OF ACTIVE CONCENTRIC CIRCULAR -

Introduction .#"1bRWpZ  
Dual-frequency operation of c!.=%QY
 
microstrip antennas have been studied to K4_~ruhr  
some extent by many researchers [1]-[3]. Wa(W&]  
Until now, however, there are only little (Z5q&#f  
attentions for integration these type of NWw<B3aL  
microstrip antenna with active circuits to d8rBu jT  
perform what we call dual-frequency 15o9CaQw4"  
operation of active microstrip antenna $|rCrak;  
although these integration already known yq1Gqbh l  
will increasing the performance of Ob7zu"zr  
microstrip antenna. F ~*zC`>Y  
This paper describe about oN_S}o  
designing and building a dual-frequency keae.6[  
operation active microstrip antenna, that =sxkrih  
is the integration of circular-ring JvKO $^  
concentr .. ejP,29  
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