Ultra-wideband Conical Log-Spiral Circularly Polarized Feed for Radio Astronomy
Artikel i vetenskaplig tidskrift, 2019

In order to meet the requirements of the new generation of radio telescopes, we have developed a new topology called DYQSA, which stands for DYson Quad-Spiral Array. The design exhibits dual circular polarization in contrast to dual linear polarization of state-of-the-art feeds. It covers the required ultra-wideband (UWB) from 2 GHz to 14 GHz with an almost constant and real input impedance which facilitates the design of the feeding structure and the Low Noise Amplifiers (LNAs). Different versions are investigated for enhancing feed performance, ensuring higher aperture efficiencies and mechanical stability. Simulation results of the reflector loaded by the proposed feed show an aperture efficiency of 65±5% can be achieved with a noise antenna temperature around 14 K and a System Equivalent Flux Density (SEFD) of about 1300 Jy, both averaged over the required bandwidth at zenith. Measurements of the single-element and the four-element feeds are presented. Comparisons with other state-of-the-art feeds are shown in terms of total aperture efficiencies, design adaptability to different reflectors, calibration signal injection, the required number of LNAs per feed, cost, and physical volume.

Reflector antenna feeds

Dual-polarized antennas

Signal to noise ratio

Conical antennas

Antenna radiation patterns

Log spiral antennas

3-D printing

ultra wideband (UWB) antennas

Radio telescopes

Apertures

DYson Quad-Spiral Array (DYQSA)

Radio astronomy

Very Long Baseline Interferometry (VLBI)

Circular polarization

VLBI2010 Global Observing System (VGOS)

Författare

Kerlos Atia Abdalmalak

Signal Theory and Communication Department, Carlos III University of Madrid (UC3M), Spain

Gabriel Santamaría Botello

Signal Theory and Communication Department, Carlos III University of Madrid (UC3M), Spain

Sergio Llorente-Romano

Signal Theory and Communication Department, Carlos III University of Madrid (UC3M), Spain

Alejandro Rivera-Lavado

Signal Theory and Communication Department, Carlos III University of Madrid (UC3M), Spain

Jonas Flygare

Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium, Elektroniklaboratorium

José Antonio López Fernández

Observatorio de Yebes (IGN)

José Manuel Serna Puente

Observatorio de Yebes (IGN)

Luis Emilio García-Castillo

Signal Theory and Communication Department, Carlos III University of Madrid (UC3M), Spain

Daniel Segovia-Vargas

Signal Theory and Communication Department, Carlos III University of Madrid (UC3M), Spain

Miroslav Pantaleev

Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium, Elektroniklaboratorium

Luis Enrique García-Muñoz

Signal Theory and Communication Department, Carlos III University of Madrid (UC3M), Spain

IEEE Transactions on Antennas and Propagation

0018-926X (ISSN)

Vol. Early Access 2949700

Infrastruktur

Onsala rymdobservatorium

Ämneskategorier

Elektroteknik och elektronik

DOI

10.1109/TAP.2019.2949700

Mer information

Senast uppdaterat

2020-01-04