A dual operating frequency band periodic half-width microstrip leaky-wave antenna

The dual operating frequency band periodic half-width microstrip leaky wave antenna (LWA) is presented in this paper. The proposed antenna consists of a series of half-width microstrip LWA with two different sizes. The radiating periods are placed on different sides of the transmission line. The radiating period works in the slow-wave region of the first higher-order mode, and the periodic construction radiates the power out along the edges. The experimental results show that the main lobe scans twice, electronically and continuously, from 131° to 95° in H-plane(y-z plane) when the operating frequency increases from 4.2 GHz to 5.1 GHz, and from 6.7 GHz to 8 GHz. The main lobe directs at the same angle when the antenna works at a different frequency.