This paper presents the design and measurement
of a novel transmit-array (TA) that is able to combine wide
beam steering and high gain for two distinct frequency bands.
The TA is designed for a mobile ground platform to operate at
satellite communications in the Ka-bands: Rx (19.7-20.2 GHz)
and Tx (29.5-30.0 GHz). A 28 dBi gain is obtained for 30 GHz
and 24 dBi for 20 GHz. The zenith beam steering results from a
linear displacement of the aperture (􀫚􀫢􀫟 × 􀫚􀫝􀫠 􀢓􀢓􀫛) in front
of a stationary feed. A scanning range of 50º was obtained with
2dB scan loss. Overall, the dual-band TA performs as well as if
two independent single band apertures were designed