[天线]COMPACT WIDE-BAND MICROSTRIP ANTENNAS

我最近发的都应该是微带天线的。 =},{8fZ4  
PCS and cellular phones are required to operate well beside the human body. They are usually 8<{;=m8cQ  
hand-held and randomly orientated by the operator. Therefore, their antennas are required to be small w2C&%Xk  
in size, light in weight, and sensitive to two perpendicular polarizations. Their radiation patterns aiJnfU]W  
should be quasi-isotropic, in all the principal planes, and they should have a wide bandwidth. The K0oFPDJN  
effect of the human body on the antenna as well as the specific absorption rate (SAR) of the radiation _0.pvQ  
from the antenna by the human body should be as small as possible. Furthermore, it is always xG8`'SNY  
desirable to integrate the antenna to the Printed Circuit Board (PCB) or the plastic case of the phone. YNk|+A.<d  
Therefore, microstrip antennas could be considered as one of the best candidates for such \q,s?`+B  
applications. Microstrip antennas are relatively easy to manufacture in a very accurate repeatable A=y"x$%-_  
way. They may be fed by coupling and thus, there would not be any physical contact between the 1|]xo3j"'  
antenna and the RF circuit. Furthermore, it is relatively easy to separate the receive and the transmit `zY!`G  
bands of microstrip antennas to eliminate the duplexer or, at least, make it easy to design. Also, it is -p]>Be+^x  
relatively easy to design dual band internal integrated microstrip antennas for PCS and cellular g}m+f]|  
phones. Moreover, internal i .. VyY.r#@  
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