[問題] PIFA antenna是靠ground輻射?
以前研究所時期 實驗室幾乎一致認為inverted L antenna是靠feed line輻射
如下圖所示
http://img28.imageshack.us/img28/9412/1234qv.png
但是最近看一本書
"Antenna design for mobile device" 裡面說明ILA or IF天線的極化方向取決於ground
的方向
http://img440.imageshack.us/img440/6738/46241066.png
其中ground的長度與波長比例會影響到Ephi 的pattern
這我困惑 難不成PCB的ILA PIFA天線是靠ground輻射?
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