| Popis: |
A dual-beam scanning microstrip antenna is proposed in this letter. The well-known characteristic of the conventional leaky wave antenna is the beam scanning with operating frequency variation. Here, two L-shaped slots are applied on the ground plane of the conventional leaky wave antenna structure to obtain the dual-beam scanning characteristic. The results show that this will work with relatively simple structure radiatng not only in the upper half-plane, but also in the lower half-plane. The upper half-plane main lobe scans from 356 - (i4 - ) to 24 - (scanning region is 28 - ). Meanwhile, the lower half-plane main lobe scans form 190 - (i170 - ) to 161 - (scanning region is 29 - ). The 7-dB return loss bandwidth is 600MHz from 3.4GHz to 4GHz. In addition, the measured average antenna gain is about 5.3dBi in the operating frequency. |
