Outside device null for small-sized terrestial station

摘要

PURPOSE:To use the C band small size ground station use outdoor equipment with the Ku band small size ground station use parabolic antenna by providing a reception low noise amplifier or the like to the focus of the parabolic antenna and providing a housing in the vicinity of the focus. CONSTITUTION:A cross polarized branching filter 11 and a reception low noise amplifier 12 are installed at the focus of a parabolic antenna 17 and a housing 1 containing a transmission power amplifier 2 and a transmission frequency converter 3 or the like is installed in the vicinity of the focus. Then the housing 1, the amplifier 12 and the branching filter 11 are interconnected by using low loss coaxial cables 16, 16'. Thus, the heat dissipation is increased attended with the increase in the output power of the amplifier 2 and even when the size of the housing 1 is increased or its weight is increased, the mechanical stability of the antenna is not lost. Moreover, the deterioration in the noise characteristic of the amplifier 12 is prevented to attain excellent reception performance and the deterioration in the transmission output due to the cable loss is reduced. Then the outdoor equipment for the C band small size ground station is used by the parabolic antenna for the Ku band small size ground station.