A Multi-Beam Grid Array Antenna with Multi-Port Excitations

This paper presents a grid array antenna which can realize multiple beams by applying multiple excitations at different ports with phase differences. The proposed antenna operating at 5.2 GHz contains 4 colinear ports which can generate double beams and single beam with different main beam angles. The antenna, fabricated on a substrate with air layer, generates +/- 17 degrees double beams with the gain of 9.1 dB. In single beam situation, the antenna can scan from -20 degrees to 20 degrees in the E plane just changing the two cross ports (e.g. port 1 and port 3) phase differences. The measured results show a good agreement with the simulated ones.