Ka-band 7-Channel Output Multiplexer for Broadcasting Service

摘要

The next satellite of the Chollian satellite which has been launched in June 2010 will provide services of communications and high-quality broadcasting services. The high-quality broadcasting service will use the new frequency band of 21.4 GHz ~ 22.0 GHz to provide a multi-channel HDTV service. The output multiplexer for this purpose has been designed and fabricated, and this paper will present the results. The output multiplexer has 7 channels in 21GHz band. The bandwidth and the guard band are 72 MHz and10 MHz respectively. Each channel filter is a 5-pole dual-mode filter using circular waveguides for cavities and couplings between cavities or modes are realized by slot-type irises and coupling screws. The manifold uses WR51 rectangular waveguides. The test result shows that the output multiplexer's performance is satisfactory.