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- [1] Efficiency degradation caused by an axial feed defocusing in generalized classical axially-symmetric dual-reflector antennas 1999 SBMO/IEEE MTT-S INTERNATIONAL MICROWAVE AND OPTOELECTRONICS CONFERENCE, PROCEEDINGS, VOLS 1 & 2: WIRELESS AND PHOTONICS BUILDING THE GLOBAL INFOWAYS, 1999, : 478 - 482