TY - RPRT TI - TEM horn antenna design principles AU - Canles, Seturnino AU - Davis, Benjamin AU - Johnk, Robert T AU - Novotny, David R AU - Veneman, Jason AU - Grosvenor, Chriss A PY - 2007 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS TN 1544 DO - 10.6028/NIST.TN.1544 ER -