Abstract

In this work an all-metal Rotman lens antenna design is presented. Ridge waveguides are used for the input and output ports of the lens to achieve broadband behavior in the K/KA bands of the new generation of satellite communications (17.3 GHz to 31 GHz). The Rotman lens is composed by 5 input and 5 output ports, with a maximum beam scanning of 20 degrees. The connection between the input and output ports is done through a parallel plate waveguide (PPW) in the TEM regime. This simple configuration allows to have an initial assessment of the antenna port isolation and return losses, for the designed ridge to parallel plate waveguide transitions. This preliminary work shows promising results which pave the way for future improvements in terms of bandwidth and scanning performance.

Highlights

  • The Rotman Lens Antenna is one of the most popular types of constrained lens

  • The combination of broadband operation, compactness and wide-angle beam steering makes this type of antenna an appealing solution for a wide range of applications related with 5G and satellite communications [1]

  • As a beam forming network (BFN), the radiation of each antenna input port is channeled to multiple output beam ports that collectively form the collimated beam

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Summary

INTRODUCTION

The combination of broadband operation, compactness and wide-angle beam steering makes this type of antenna an appealing solution for a wide range of applications related with 5G and satellite communications [1]. The physical aperture of the feeding elements will further constrain the array spacing Another crucial step for this design is the bandwidth of the transmission lines and the transition to the PPW. In the context of satellite communications, Rotman lens are appealing for the space segments, being currently investigate as viable solution for the emergent mega-constellations in low and medium Earth orbit (LEO/MEO) [3].

ROTMAN LENS DESIGN
FEEDING NETWORK
ROTMAN LENS FULL-WAVE SIMULATION
CONCLUSIONS
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