2D Periodic Leaky-Wave Antennas in the Microwave and Optical Regimes

Research on the 2‐D annular leaky‐wave antenna

“…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 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.…”

“…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 .…”