Abstract: A patch antenna array having multiple beam-forming capability is formed as a feed network (15) on a lower microstrip substrate with patches (13) overlaying these on an upper substrate. The patch array consists of a number of linear series-connected patch arrays (13a, 13b, 13c) each array being resonant and may have open circuits at each end. A travelling wave arrangement of feed lines (15a, 15b, 15c) is provided and in one embodiment the total number of beams which may be generated is twice the number of feed lines. The invention is useful in small satellite communication earth terminals and is suitable for operation in the region of 10 GHz.

Abstract: There is provided an improved trailer and tailgate therefore. The means for attaching the tailgate to the remainder of the trailer is independent of the inside surfaces of the sidewalls of the trailer. Thus the sidewalls are free from obstructions permitting a free flow of material out of a trailer when it is being dumped. A pair of cane shaped rods are received through the top and bottom of the tailgate and are connected to the floor and to the tops of the sidewalls of the trailer.