Abstract
The sidelobe level (SLL) is an essential performance factor for satellite communication antennas. A low-SLL design can effectively suppress adjacent satellite interference. A low-SLL design method for a variable inclination continuous transverse stub (VICTS) antenna is proposed in this paper. The VICTS antenna is composed of three rotatable parts: a feeding plate, a radiation plate, and a polarization plate. The radiation plate comprises two groups of stubs with different radiation ratios. Combined with the nonlinear slow-wave structure attached to the feeding plate, the radiation ratio of the unit can be adjusted. The aperture field of the VICTS antenna using this method can be tapered in order to suppress the SLL. To verify the effectiveness of this method, the antenna prototype is fabricated and measured in a microwave anechoic chamber. The simulation and the measurement are in good agreement. The reflection coefficient of the antenna is kept below −15 dB and between 13.75 GHz and 14.5 GHz. When the radiation plate and the feeding plate rotate relative to each other, the pattern beam can be scanned from 5° to 70 ° . In the scanning range, the typical SLL can reach −18 dB.
Highlights
Satellite communication [1,2,3] is a highly specialized technology field and one of the important methods of modern communication and informatization
Since the research focus of this paper is the lowSLL design and the polarization plate has no effect on the antenna pattern, the polarization plate is not described in detail
The red dotted line area is a nonlinear slow-wave structure attached to the bottom of the parallel plate. e slow-wave structure is made of lightweight plastic processed with electroplating, with an equivalent dielectric constant of 1.14 and no loss
Summary
Satellite communication [1,2,3] is a highly specialized technology field and one of the important methods of modern communication and informatization. E stub has the characteristics of a wide band, high radiation ratio, low loss, and compact structure. E radiation and feeding structures of the VICTS antenna can rotate relative to each other. E relative rotation of the radiation plate with the feed produces a phase difference to steer the beam. E radiation ratio of the stub is changed by adjusting the height of the parallel plate waveguide and the width of the slot. E slow-wave structure is made of lightweight plastic processed with electroplating, with an equivalent dielectric constant of 1.14 and no loss In order to suppress the generation of the grating lobe, the period d of the stub should be less than the
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