2015/03/30 by Matthew Morgan, Matthew A. Morgan, Morgan, Matthew A. +2
Engineering · Physics and Astronomy · #Electromagnetic Compatibility and Measurements #FOS: Physical sciences #Gyrotron and Vacuum Electronics Research #Instrumentation and Methods for Astrophysics (astro-ph.IM) #Microwave Engineering and Waveguides #astro-ph.IM
paper · pdf · doi:10.48550/arxiv.1503.08667
5 pages, 13 figures
arxiv created 2015/03/30 · openalex publication_date 2015/03/30 · arxiv updated 2015/03/31 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/04
The design, fabrication, and measurement of a coax to double-ridged waveguide launcher and horn antenna is presented. The novel launcher design employs two symmetric field probes across the ridge gap to minimize spreading inductance in the transition, and achieves better than 15 dB return loss over a 10:1 bandwidth. The aperture-matched horn uses a half-cosine transition into a linear taper for the outer waveguide dimensions and ridge width, and a power-law scaled gap in order to realize monotonically-varying cutoff frequencies, thus avoiding the appearance of trapped mode resonances. It achieves a nearly constant beamwidth in both E- and H-planes for an overall directivity of about 16.5 dB from 10-100 GHz.