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Dielectrically Loaded Quad-Ridge Flared Horn for Beamwidth Control Over Decade Bandwidth—Optimization, Manufacture, and Measurement
IEEE Transactions on Antennas and Propagation ( IF 4.435 ) Pub Date : 2019-09-30 , DOI: 10.1109/tap.2019.2940529
Jonas Flygare; Miroslav Pantaleev

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.
更新日期:2020-01-07

 

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