Design of a THz Microstrip Fast Wave Antenna

A novel terahertz(THz) microstrip fast wave antenna working at 200 GHz is proposed in this paper. Firstly an odd-mode feeding method using CPS is employed to excite fast wave in the THz microstrip structure. Then the THz slot ring antenna is fed by the odd-mode feed network structure based on fast wave theory, which can enlarge the size of antenna for reducing design redundancy of THz antenna, manufacturing difficulty and decreasing fabrication cost. Furthermore, compared with an equally sized ring fed by a common microstrip, simulation results verify that the radiation pattern of our proposed fast wave antenna does not have a deep depression in the zenith direction with a enlarged size. It meets the requirements of many applications.