Abstract
In this letter, we propose a frequency scanning leaky-wave array antenna with a significantly increased scanning range. The proposed structure consists of a pair of rectangular waveguide fed leaky-wave slot array antennas that are designed to achieve focusing in the backward and forward quadrants at 26.5 GHz and 23 GHz respectively. A total scanning range of about 73˚ is achieved by the structure simply by changing the frequency. The focusing gain between the backward and forward quadrants varies from 23 dBi to 25 dBi with the operation of the two waveguides separated by exploiting the cutoff region of one waveguide, operating with negative phase constant, and the endfire radiation of the other waveguide, operating with a positive phase constant, allowing the use of a single feed for both waveguides.
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