Abstract
AbstractA mathematical model of variable inclination continuous transverse stub (VICTS) antenna for low sidelobe design is proposed in this paper. VICTS antenna is an antenna with continuous transverse stubs on the parallel-plate waveguide and additional branches attached to the transverse stubs to generate radiation. The antenna using this technique has high aperture efficiency and keeps a significant solution for high-gain antenna. However, the sidelobe level (SLL) of this antenna is relatively high and increases continuously as the pitch angle decreases. This paper presents a fast calculation model for the SLL of VICTS antennas using leaky-wave theory and antenna array theory. The full-wave simulation results and model calculation results are in good agreement, so this model can be used for SLL suppression of VICTS antennas in different frequency bands. By controlling the aperture field distribution to be tapered, the SLL is suppressed to − 23.7 dB using this mathematical model.
Highlights
With the rapid advance of science and technology including satellite communication, mobile satellite communications that work at high frequencies such as Ku-band have been further studied [1,2,3]
Variable inclination continuous transverse stub (VICTS) antenna is a novel antenna evolved from continuous transverse stub (CTS) antenna [8,9,10,11,12]
The beam scanning can be realized by rotating the two plate of the VICTS antenna relatively, and the beam direction of the radiation pattern can be quickly calculated according to the relative rotation angle [15]
Summary
With the rapid advance of science and technology including satellite communication, mobile satellite communications that work at high frequencies such as Ku-band have been further studied [1,2,3]. This paper presents a calculation method for the pattern of VICTS antenna at different scanning angles. Where k = 2πf/c, f is the operating frequency, c is the speed of light in vacuum, εe is the equivalent dielectric constant of the slowwave structure [21, 22], In is the unit amplitude, which can be expressed as In this case, one-dimensional linear array theory can be used to calculate the antenna’s radiation pattern F(θ, w). When the two plates of the VICTS antenna rotate relatively, the angle between the radiation slot and the equal phase plane is denoted as γ. The VICTS antenna is regarded as a two-dimensional array by dispersing the different positions on the radiation slot at equal distance. The short axis pattern of the antenna can be obtained by taking the section parallel to the U-axis and passing through the maximum value of the pattern
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