Title :
Broadband amplitude tapering for a linear W-band array antenna for Gaussian beam-shaping
Author :
Koenen, Christian ; Siart, Uwe ; Eibert, Thomas F. ; Conway, Garrard D. ; Stroth, Ulrich
Author_Institution :
Lehrstuhl fur Hochfrequenztech., Tech. Univ. Munchen, Munich, Germany
Abstract :
A W-band horn array antenna is currently being developed for the Doppler reflectometry system on ASDEX Upgrade tokamak in Garching. The antenna is dedicated to radiate a well defined Gaussian beam over nearly the whole W-band (75GHz to 105GHz). As in-vessel moving parts have to be avoided, the underlying structure of the feed network is a series feed. This contribution examines a broadband coupling structure to couple a defined amount of power from the main feed line to the radiating elements. Its applicability is validated by measurements of a prototype coupling network and full-wave simulation of a 32-element series fed array antenna.
Keywords :
antenna feeds; antenna radiation patterns; broadband antennas; horn antennas; linear antenna arrays; microwave reflectometry; millimetre wave antenna arrays; 32-element series fed array antenna; ASDEX upgrade tokamak; Doppler reflectometry system; Gaussian beam-shaping; broadband amplitude tapering; broadband coupling structure; frequency 75 GHz to 105 GHz; full-wave simulation; linear w-band array antenna; prototype coupling network; radiating elements; series feed; Apertures; Arrays; Broadband antennas; Broadband communication; Couplings; Feeds; Plasmas;
Conference_Titel :
Microwave Conference (GeMiC), 2015 German
Conference_Location :
Nuremberg
DOI :
10.1109/GEMIC.2015.7107788
