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

Introduction !<&To  
Dual-frequency operation of "r=p/"4D  
microstrip antennas have been studied to a51}~V1  
some extent by many researchers [1]-[3]. = Rn  
Until now, however, there are only little ]k$:sX  
attentions for integration these type of ta@fNS4  
microstrip antenna with active circuits to W!+eJ!Da  
perform what we call dual-frequency EK
Ac>g  
operation of active microstrip antenna \'r;1W  
although these integration already known wE-y4V e  
will increasing the performance of hWiHKR]  
microstrip antenna.  Spw^h=o  
This paper describe about ?
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designing and building a dual-frequency Qe0?n  
operation active microstrip antenna, that a$EudD#+  
is the integration of circular-ring TtrV -X>L  
concentr .. RA!8AS?  
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