Properties of microwave and optical 2-D periodic leaky wave antennas

Research on the 2‐D annular leaky‐wave antenna

“…14,15 In 2020, a two-dimensional (2-D) annular periodic LWA with metal strip gratings printed on a grounded dielectric slab is proposed, suppressing the open stopband and achieving high-gain broadside radiation over a wide bandwidth. 16 It is easy to see that in these studies about 2-D LWA, most of them can be classified into the array antenna, 9,[11][12][13][14][15] and few of them are about the real 2-D structure. 10,16 The research about the radiation mechanisms and design methods of the 2-D LWA is still rare.…”

“…In general, studies on the 1‐D LWA have already been comprehensive and thorough. In contrast, research about the 2‐D LWA is not as common 9–16 . A planar 2‐D leaky‐wave (LW) antenna with segmented circular strip gratings is proposed and designed, to achieve broadside radiation for millimeter‐wave applications 9 .…”

“…[11], and then the radiation mode and radiation properties are explored in refs. [12, 13]. Later, in 2017 and 2019, the author then respectively investigated the propagation characteristics and the radiation properties of the 2‐D LWA in the microwave regime and also the optical regime 14,15 .…”