Computer-Aided Group Delay Equalization for Broad-Band Satellite Transponder Applications

Equalization of the group delay characteristic of a satellite repeater has been examined. The channel group delay includes the transmit and receive filter group delay, and the transponder filter group delay. The perturbation of the transponder group delay of a satellite channel caused by the dual-path transmission effect resulting from an adjacent channel has also been studied. Various combinations of filter and equalizing sections have been examined. In the realization of wide passband filters, equalization of group delay presents some difficulties, especially when it is achieved by networks with many sections. The minimum peak-to-peak group delay deviation in the specified passband has been achieved by using a recent nonlinear programming technique with a penalty function approach.