Efficiency improvement of triplate array

Triplate line fed arrays have been researched extensively over the last 10 years for DBS television subscriber antenna in Japan and Europe. The chief advantage of this type of planar array is the reduction of radiation from the array's feedlines. One class of triplate fed array employs a thin metal sheet with apertures punched for radiation from patches on the triplate layer [1], Figure 1. This type of triplate array is considered as a candidate for LMCS subscriber antenna. The focus of this research is to identify different methods for increasing the aperture efficiency of this type of triplate fed array, in order to counter the losses that are expected to occur at EHF.