Variable permittivity dielectric material loaded stepped-horn antenna

44Table 4.4 Amplitude and Phase of Reflection and Transmission Coefficient of a TE10Mode in a Dielectric (εr = 3) Loaded Horn Antenna of Length L = 2.5A. A is theWavelength Inside the Dielectric Medium.Table 4.5 Comparison of VSWR's and Gains of the 20 dB Standard Gain Horn Antenna.Numerical validation of the developed code was carried out also on a dielectric loadedwaveguide [20]. Numerical simulations for the input reflection coefficient correspondingto an open-ended loaded waveguide with dielectric material εr = 2.63, the length ofwaveguide L = 9.51mm, are compared with experimental results. Figure 4.1 showsexcellent agreement between the computed model and measured results.The presence of a dielectric material loading in a 10dB standard gain antenna ischosen as a test antenna to study the proposed method. Input waveguide section sizes arechosen as al = 22.86 mm and b 1 = 10.16 mm. Aperture sizes are aA = 40.13 mm