[天线]COMPACT WIDE-BAND MICROSTRIP ANTENNAS

我最近发的都应该是微带天线的。 rsQtMtS2  
PCS and cellular phones are required to operate well beside the human body. They are usually S!UaH>Rh  
hand-held and randomly orientated by the operator. Therefore, their antennas are required to be small ^#$n~]s  
in size, light in weight, and sensitive to two perpendicular polarizations. Their radiation patterns ]'}L 1r  
should be quasi-isotropic, in all the principal planes, and they should have a wide bandwidth. The )UR7i8]!0  
effect of the human body on the antenna as well as the specific absorption rate (SAR) of the radiation I0-MRU~[K  
from the antenna by the human body should be as small as possible. Furthermore, it is always d~H`CrQE*  
desirable to integrate the antenna to the Printed Circuit Board (PCB) or the plastic case of the phone. ?}0,o.  
Therefore, microstrip antennas could be considered as one of the best candidates for such |N2#I
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applications. Microstrip antennas are relatively easy to manufacture in a very accurate repeatable tc! #wd+u  
way. They may be fed by coupling and thus, there would not be any physical contact between the uph(V  
antenna and the RF circuit. Furthermore, it is relatively easy to separate the receive and the transmit ]`K2N  
bands of microstrip antennas to eliminate the duplexer or, at least, make it easy to design. Also, it is 2 nCA<&  
relatively easy to design dual band internal integrated microstrip antennas for PCS and cellular JI}'dU>*U:  
phones. Moreover, internal i .. rH-23S  
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