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

Introduction &i6),{
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Dual-frequency operation of zBzZxK>$  
microstrip antennas have been studied to W')Yg5T  
some extent by many researchers [1]-[3]. m
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Until now, however, there are only little )"7iJb<E  
attentions for integration these type of Jdj2~pTq  
microstrip antenna with active circuits to #Lh;CSS  
perform what we call dual-frequency UM"- nZ>[  
operation of active microstrip antenna Mh]Gw(?w  
although these integration already known at,XB.}Z]  
will increasing the performance of ivJ@=pd)B  
microstrip antenna. nksLWfpG?B  
This paper describe about lR6@ xJd:@  
designing and building a dual-frequency n{argI8wF  
operation active microstrip antenna, that I;wp':  
is the integration of circular-ring |ATvS2  
concentr .. s"r*YlSp"  
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