A new two-terminal feeding active leaky-wave antenna

A new two-terminal feeding active-integrated leaky-wave antenna design is d emonstrated. The S-band microstrip two-terminal feeding leaky-wave antenna is integrated with an active high-electron mobility transistor (HEMT) oscil lator to produce a two-beam radiation pattern, The antenna is fed asymmetri clly at both sides to excite the first higher order mode, This configuratio n, as compared to a single-terminal feeding leaky-wave antenna, has the adv antage of the multidirection and the reduction of the reflected wave caused by the open end of the radiating element. Measured results show that the r adiation directions of two beams are approximately at 34 degrees and 140 de grees, the effectively isotropic radiated power (EIRP) is close to 17.5 dBm , and the return Loss is almost less than -10 dB between 9 and 11.5 GHz.