Millimeter-wave spiral microstrip-based leaky-wave antenna for circularly polarized radiation

In this paper a circularly polarized (CP) leaky-wave antenna is proposed for millimeter-wave communication. By the addition of metallic strip grating on a ground dielectric slab (GDS), the fundamental TM₀-mode surface waves on the GDS is transformed into leak waves (LWs). Meanwhile, by tailoring the phases and magnitudes of the LWs, CP radiation can be achieved. Investigations show that the proposed antenna features characteristics of high gain and simple feeding structure.