無線通訊 關鍵性智慧財產權 無線區域網路 無線都會網路 無線個人網路 多層陶瓷技術 低溫共燒陶瓷厚膜製程 臺灣第四代行動通訊 Wireless communications Essential IP Wireless local area network WLAN Wireless metropolitan area network WMAN Wireless personal area network WPAN Multi-layer ceramic MLC Low-temperature co-fired ceramic LTCC Taiwan 4th generation mobile communication TW4G