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？ 
本人用pifa設計....有指向性但增益很低(-10dBi) 
請問有人覺得這尺寸設計得出來嗎？ 

网友回复:

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 put into implementation. 
 
Thank you

网友回复:

 
英文看着很舒服

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