To meet the requirements of large system capacity and miniaturized terminal of mobile satellite communication

Muti-beam array antenna is adopted to realize the high gain and wide coverage by LEO satellite.This paper presents a planar transmitter array antenna with equal flux density coverage according to CDMA standard utilized by LEO satellite.The phased array antenna consists of an array antenna with 61 micro-strip elements

61 RF front ends

and digital beam forming network (BFN).Orthogonal transform and phase-amplitude adjustment are completed in digital BFN.The 61-channel IF signals outputted by digital BFN are up-converted and amplified by RF front ends

finally transmitted by array antenna to realize the desired shaped-beam coverage.The design methodology and measured results of DBF phased array antenna is discussed in the paper.The measurements demonstrate that all the parameters of array antenna are consistent with the predefined requirements

which validates the rationality of system design and project implementation.