Yu.V. Krivosheev - Ph. D. (Eng.), Senior Research Scientist, PJSC «Radiofizika» (Moscow); Lecturer, Department of Radiophysics and Engineering Cybernetics, Moscow Institute of Physics and Technology (State University) E-mail: krivosheev-yury@yandex.ru A.V. Shishlov - Ph. D. (Eng.), Head of Department, PJSC «Radiofizika» (Moscow); Deputy Head of Department of Radiophysics and Engineering Cybernetics, Moscow Institute of Physics and Technology (State University) E-mail: shishlov54@mail.ru

Comparison of antennas based on large-aperture scanning radiators with classical electrically scanned arrays is carried out. Both solu-tions can be used at spaceborn antenna systems. A reflector and a lens large-aperture scanning radiators optimized for service area ±8.7° were used. Diameter of the former is 10.25λ, diameter of the latter is 12.08λ. A high-efficiency horn antenna with diameter 3.96λ was used as phased array radiator (array spacing is 4.0λ). Subarrays of seven horn antennas can be spaced at 10.58λ, which is close to the spacing between large-aperture scanning radiators. Also, number of channels in large-aperture scanning radiators is seven. Based on the comparison of gain of large-aperture scanning radiators and gain of the subarray with horn radiators the following con-clusions were made. With equal number of channels and equal antenna area, gain of antenna based on large-aperture scanning radiators is about 2 dB lower than that of an array with horn radiators; grating lobes of an antenna based on large-aperture scanning radiators are 2.6 times closer to the main lobe than that of an array with horn radiators; both amplitude and phase control is required in antennas based on large-aperture scanning radiators while arrays with horn radiators require only phase control; also, antennas based on large-aperture scanning radiators are more structurally complex.

 

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