... bit, loi anten vi di (microstrip antennas) v m nh g to th lc s dng ph bi th n hi i. Anten vi ... Reader Antenna for 2.4 GHz Band, PIERS Proceedings, Xi'an, China, March 22 26, 2010. 4. Dau-Chyrh Chang, Bing-Hao Zeng, and Ji-Chyun Liu, High Performance Antenna Array with Patch Antenna ... on its surface and a circular metal plate (reflector). The antenna substrate is stacked above the reflector by a small distance. The antenna size and positions of the two feeding ports using...