Active dual-beam leaky-wave antenna with asymmetrically scanning capability

An active microstrip leaky-wave antenna possessing asymmetrically dual-beam scanning capability is demonstrated. An active HEMT up-converter is integrated at the right terminal of the two-terminal feeding microstrip leaky-wave antenna. This approach creates dual-beam asymmetrically scanning radiation patterns. When the right beam is fixed in one position, the other beam can be scanned electronically by varying the IF frequency. The measured results show that when the position of the right beam was fixed (48 degrees), a scanning angle of 22 degrees for the left beam could be achieved as the IF input frequency was varied from 0.7 to 2GHz (UHF band).