Projeto de Circuito Beamformer para Antenas com Dupla Polarização Circular

Danielle O. A. Sieber, Juner M. Vieira, Ildefonso Bianchi, Daniel Basso Ferreira, Daniel Nascimento, Felix Antreich

DOI: 10.14209/sbrt.2022.1570823172

Evento: XL Simpósio Brasileiro de Telecomunicações e Processamento de Sinais (SBrT2022)

Keywords: Beamformer circuit Circular polarization GNSS receivers Sinuous antenna

Abstract

This paper presents the design of a beamformer circuit for dual circularly polarized antennas composed of four sequentially rotated radiators. The beamformer operates over the L band, and its architecture has two 180-deg hybrid couplers, one 90-deg hybrid coupler, and two low-noise amplifiers. Commercial components are selected to build the circuit prototype, and its scattering parameters are measured. The prototype is used to feed a sinuous antenna designed to receive GNSS signals. The antenna measurements show that the broadside axial ratio is below 2.25 dB from 1 to 2 GHz, thus validating the beamformer operation.

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