A Medium-Loaded Low-Frequency Octave Wide-Beam Shrinking Field Feed Source

Abstract

The invention relates to a low frequency octave wide wave beam compact range feed source based on medium loading. A ridge waveguide part cooperates with the ridge curve of a horn, which can widen thethickness of the ridge to the most extent. A feed probe is a semi-rigid coaxial cable feed joint (8) which is connected by SMA joints, and the two feed probes are vertically arranged, and are respectively corresponding to two polarizations of the feed source. The terminal position at the oral surface of the ridge curve is disposed in a horn oral surface but not at the edge of a horn wall (1), which effectively reduces the distribution area of a high frequency antenna oral surface without affecting the low frequency antenna oral surface. The invention is advantageous in that a rather small hornopening angle is adopted, and the phase difference of the high frequency oral surface field can be further reduced; through optimizing the shape of medium loading materials and the relative positionof a quadruple-ridged horn, the radiation electric field of feed source antenna can be concentrated in the medium area, and the wave beam can be widened and the phase center can be stabilized; the medium loading quadruple-ridged horn antenna is small in volume, light in weight, and low in cost.

Description

technical field [0001] The invention relates to the technical field of a compact field feed source, in particular to a medium-loaded low-frequency octave wide-beam compact field feed source. Background technique [0002] With the continuous development of the compact field technology, the low-frequency measurement requirements of the compact field are constantly increasing, and a relatively wide measurement bandwidth is often required at low frequencies, so as to increase the resolution in the distance direction and improve the test efficiency at the same time. The original standard band feed can not meet the requirements of compact field measurement. Low-frequency broadband compact field feeds will become an essential measurement tool for future compact field systems. There are many alternative antennas that can be used as a broadband compact field. Among them, the ridge waveguide horn has a wide impedance bandwidth and has the potential to be used as a compact field feed ...

AI Technical Summary

Problems solved by technology

However, like most ridge horn literature, the beam width, amplitude pattern taper and phase pattern taper of the ridge waveguide horn are not strictly controlled, and cannot be used as a compact field feed.

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