Scanning-Rate Enhancement of Periodic Leak-Wave Antennas Using Delay Element

This paper explores and compares two approaches to enhance the scanning rate of a series fed patch (SFP) leaky-wave antenna. In the designs, we insert into the feeding line two different allpass delay elements, whose group delay is high in a wide bandwidth. The results revealed that leaky-wave antenna with delay line has increase the scanning rate by 100%-128%.