S. N. HsiehC. H. TsengTAH HSIUNG CHU2018-09-102018-09-102005-12http://scholars.lib.ntu.edu.tw/handle/123456789/317631[SDGs]SDG7A three element retro-directive antenna arrayconference paper10.1109/APMC.2005.16066962-s2.0-33847139113