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We have developed a broadband corrugated horn in the 120–270 GHz and a horn array in the 80–180 GHz bands. The geometry of corrugations is so simple that the horn array can be directly machined from a bulk of aluminum with an end mill. The cross polarization and near sidelobe levels are less than $-$20 and $-$30 dB, respectively. The return loss is less than $-$15 dB in most design frequency bands,...
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