Table 1 The characteristic impedance of each section in the proposed launcher.

From: Holographic inspired high-performance circular polarized spoof surface plasmon polariton leaky-wave antenna excited by a novel launcher

Section I

Section II

Section III

Impedance step structure with height H3

Impedance step structure with height H4

Impedance step structure with height H5

50 Ω

From 50 to 35.65 Ω

33.92 Ω

30.20 Ω

24.08 Ω