[互助]RFID 美規頻段 指向性天線問題

請問尺寸長55mm寬25mm高4mm做得出915MHz指向性天線嗎? ?+yr7_f3*  
本人用pifa設計....有指向性但增益很低(-10dBi) Da=EAG-{7  
請問有人覺得這尺寸設 .. 8Bf>  
c/;;zc  

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The wave length at UHF frequency band is about 300mm. So your antenna size is too small to get a good radiation efficiency. Try to enlarge your prototype. JGs:RD'  
87 Z[0>  
Normally, we can get 3-5 dBi for monopole structure and 2 dBi for dipole. So -10 dBi is too low to be put into implementation. y Zafq"o  
HiCh:IP7>/  
Thank you

kusucar:The wave length at UHF frequency band is about 300mm. So your antenna size is too small to get a good radiation efficiency. Try to enlarge your prototype.
Normally, we can get 3-5 dBi for monopole structure and 2 dBi for dipole. So -10 dBi is too low to be p .. (2013-08-16 05:38)  p$,7qGST  

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英文看着很舒服