A Compact Machinable 90° Waveguide Twist for Broadband Applications Zeng, Lingzhen ; Tong, C. Edward ; Paine, Scott N. ; Grimes, Paul K. Abstract Publication: IEEE Transactions on Microwave Theory Techniques Pub Date: July 2020 DOI: 10.1109/TMTT.2020.2987800 Bibcode: 2020ITMTT..68.2515Z