Dielectrically Loaded Quad-Ridge Flared Horn for Beamwidth Control Over Decade Bandwidth - Optimization, Manufacture, and Measurement
Artikel i vetenskaplig tidskrift, 2020

We present the design, manufacture, and measured performance of a dielectrically loaded quad-ridge flared horn (QRFH) feed for decade bandwidth radio astronomy application. The introduction of the dielectric load improves the QRFH beamwidth control in H-plane at the mid and upper frequency range. Consequently on the reflector, illumination efficiency, phase efficiency, and the intrinsic cross-polarization ratio (IXR) have been improved. The dielectric load is made from homogeneous low-loss polytetrafluoroethylene and has a low profile with a cylinder shape for simple installation at the center of the QRFH. The dielectrically loaded QRFH presented here covers 1.5-15.5 GHz with a calculated average aperture efficiency above 50% on a f/D = 0.3 prime-focus reflector. We present a calculation of system noise temperature and sensitivity for the QRFH on a 100 m prime-focus reflector. Measured beam patterns of the QRFH are in good agreement with the simulations over the full frequency band. The input reflection coefficient was predicted to be below -10 dB across the bandwidth. We present a tolerance analysis that explains why the measured one deviates.

reflector feed

Bandwidth

Feeds

Dielectrics

Optimization

quad-ridge flared horn (QRFH)

radio astronomy

ultra wideband (UWB) antennas

Författare

Jonas Flygare

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

Miroslav Pantaleev

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

IEEE Transactions on Antennas and Propagation

0018-926X (ISSN)

Vol. 68 1 207-216 2940529

RadioNet 4

Europeiska kommissionen (Horisont 2020), 2017-01-01 -- 2020-12-31.

Infrastruktur

Onsala rymdobservatorium

Ämneskategorier

Kommunikationssystem

Elektroteknik och elektronik

DOI

10.1109/TAP.2019.2940529

Mer information

Skapat

2020-01-04