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Design and Realization of a Compact Multi-Resonator Bandpass Filter for C-Band Earth Station Antennas

The highly sensitive receiver stages of satellite earth stations must be protected from strong signals outside of the receive band in order to avoid intermodulation, overloading, or even gain compression. This can be achieved by a passive bandpass filter. The high requirements for selection and low insertion loss can only be fulfilled by a multi-resonator waveguide bandpass filter. Using a modern simulation tool based on field theory methods, we succeeded to design a 12-pole filter for C-band featuring fairly compact dimensions by two-fold folding in longitudinal direction. The high precision of the simulation method yields a widely tuning-free design. The filter insertion loss can be estimated during simulation using the well-known power loss method. Index Terms – Satellite Earth Stations, Receiver, Intermodulation, Bandpass Filter, Waveguide, Simulation