Fig. 1. Structure schematic of (a) metallic hollow waveguide and (b) dielectric-coated metallic hollow waveguide
Fig. 2. Transmission loss of fundamental mode and single-mode transmission range in metallic hollow waveguide
Fig. 3. Transmission loss of fundamental mode and single-mode transmission range in 2-mm-diameter dielectric-coared metallic hollow waveguide
Fig. 4. Single-mode transmission range versus dielectric layer thickness in waveguides with different diameters
Fig. 5. Dispersion coefficients of metallic hollow waveguides with different diameters
Fig. 6. Dispersion coefficients of fundamental mode in 4-mm-diameter dielectric-coated metallic hollow waveguide with different dielectric layer thickness
Fig. 7. Schematic of linearly polarized Gaussian beam coupling to the hollow waveguide
Fig. 8. (a) Coupling coefficient of fundamental mode versus waist/diameter ratio for metallic hollow waveguides with different diameters; (b) coupling coefficient of fundamental mode versus waist/diameter ratio for 4-mm-diameter dielectric-coated metallic hollow waveguides with different dielectric layer thicknesses
Fig. 9. Coupling coefficient of fundamental mode versus wavelength for dielectric-coated metallic hollow waveguides with different dielectric layer thicknesses at optimum waist/diameter ratio
Fig. 10. Electric fields of fundamental mode in dielectric-coated metallic hollow waveguides with different dielectric layer thicknesses of (a) d = 0, (b) d = 100 μm, (c) d = 700 μm, and (d) d = 1600 μm
Wavelengthλ /mm | | Propagation time /ns | | Δt /ns |
---|
TE11 | TM01 | | TE21 |
---|
3 | 3.714 | 4.076 | 4.885 | 1.171 | 4 | 4.107 | 5.157 | 13.502 | 9.395 |
|
Table 1. Propagation time of different modes in 4-mm-diameter metallic hollow waveguide
Dielectric layer thickness d /μm | | Propagation time /ns | | Δt /ns |
---|
TE11 | TM01 | | TE21 |
---|
100 | 3.772 | 4.227 | 4.902 | 1.130 | 500 | 5.123 | 5.659 | 5.855 | 0.732 | 1000 | 5.533 | 5.740 | 5.884 | 0.351 |
|
Table 2. Propagation time of different modes in 4-mm-diameter dielectric-coated metallic hollow waveguide