[天线]COMPACT WIDE-BAND MICROSTRIP ANTENNAS

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PCS and cellular phones are required to operate well beside the human body. They are usually oZgjQM$YP  
hand-held and randomly orientated by the operator. Therefore, their antennas are required to be small c)85=T6*aA  
in size, light in weight, and sensitive to two perpendicular polarizations. Their radiation patterns sll\g  
should be quasi-isotropic, in all the principal planes, and they should have a wide bandwidth. The F/{!tx  
effect of the human body on the antenna as well as the specific absorption rate (SAR) of the radiation Nai2W<,  
from the antenna by the human body should be as small as possible. Furthermore, it is always 5C]x!>kX  
desirable to integrate the antenna to the Printed Circuit Board (PCB) or the plastic case of the phone. hi(;;C9  
Therefore, microstrip antennas could be considered as one of the best candidates for such zC!t;*8a  
applications. Microstrip antennas are relatively easy to manufacture in a very accurate repeatable `U_)98  
way. They may be fed by coupling and thus, there would not be any physical contact between the 6d}lw6L  
antenna and the RF circuit. Furthermore, it is relatively easy to separate the receive and the transmit /{_:{G!Q0  
bands of microstrip antennas to eliminate the duplexer or, at least, make it easy to design. Also, it is ]_gU#,8  
relatively easy to design dual band internal integrated microstrip antennas for PCS and cellular cV6D<,)  
phones. Moreover, internal i .. B9z?mt'|r)  
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