Abstract
An eight-ring radial helical array antenna based on a novel slot-coupled structure is designed and simulated. The novel coupling structure has the advantages of high power-handling capacity and excellent coupling ability. The simulation results of the array antenna agree well with theoretical calculations, and the aperture efficiency is about 78.1% when the beam is in the normal direction. The power-handling capacity is about 100 MW on vacuum condition. The simulation results also show that the gain is 30.7 dB and the main lobe’s axial ratio is 0.25 dB. Furthermore, the structure of the antenna is compact, and it may be applied to larger circular helical arrays to realize higher gain and higher power-handling capacity.
Highlights
With the development of high power microwave (HPM) technologies,[1] HPM antennas with high gains and high power-handling capacities are of great interests for practical applications
The radial line helical array antennas have been widely used for HPM radiation, and have been proved to possess notable power-handling capacities, compact structures, and high aperture efficiencies.[2]
The simulation results indicate that, the reflectance gets close to 0 through optimization when rs is changing from 2.00 mm to 5.00 mm, and s is changing from 1.50 mm to -1.50 mm
Summary
With the development of high power microwave (HPM) technologies,[1] HPM antennas with high gains and high power-handling capacities are of great interests for practical applications. The radial line helical array antennas have been widely used for HPM radiation, and have been proved to possess notable power-handling capacities, compact structures, and high aperture efficiencies.[2]. The probe insertions will reduce the power-handling capacity of the system, and may result in an uneven transmission field. Conventional probes such as E-coupled and H-coupled probes have limited coupling abilities, are unsuitable for large circular array design.[4] In Ref. 5, the combination of rectangular sub-arrays forms a massive rectangular array, while it will greatly increase the volume and the ohmic dissipation of the system.
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