Concave spherical feed array for luneberg lens

Abstract

This paper presents a design of concave spherical base Vivaldi feed array for beam steering without the use of any phase shifters. The research goal is reached through the use of Luneberg lens aperture and switching of active feed array element.Vivaldi array element has solid metal sheet design with stripline feeding for linear polarization. Special elements are used for mutual coupling effects weakening and directional pattern back lobe suppression at low frequencies.The design has such advantages, like broad bandwidth, wide scan angle in azimuth and elevation, low loss level, and machining simplicity of feed array.

Effect of the rim presence on the characteristics of inhomogeneous dielectric lens antennas

“…Линзы из неоднородного диэлектрика находят применение в различных системах передачи данных [1][2][3][4][5][6][7]. Авторами были предложены конструкции линз для применения в составе антенных решёток (АР) в качестве дополнительного фокусирующего элемента, позволяющего увеличить период АР и расширить полосу рабочих частот [8][9][10].…”

Flat-layered spherical lens antenna system in conditions of slant polarized feeder radiation

“…The flat-layered spherical lens made from homogenous dielectric material [2][3][4][5] behaves like Luneburg Lens in wide angular range within certain frequency band if the incident wave polarization is linear.…”