The requirements for small, compact and inexpensive filters, which are fulfilling sophisticated electrical parameters, are constantly increasing. Small footprint filters which are maintaining the least possible electrical performance degradation should be designed by using new technologies. “Flat filters” seem to be a suitable technology.
Terms of Reference
The goal of the work is a systematic investigation of different circuit topologies for the technology of “flat filters”. Using suitable examples, this must first be investigated by simulation using tools on circuit model level and 3D- FDTD methods as well. For different circuit topologies (attenuation poles by using cross-couplings and / or blocking resonators and / or multi-port couplings) the practical feasibility and electrical parameters are to be examined. After completion of these investigations, individual filter variants are to be selected and assembled. Simulation results must be verified by testing assembled and tuned prototypes. Any deviations should be examined and clarified. Furthermore, temperature and power handling performance results of the prototypes have be examined and compared with the simulation results.
- Systematic investigation of different circuit topologies of "flat filters"
- Creation of attenuation poles below and above the passband with the help of cross-couplings, blocking resonators and / or multi-port couplings
- Simulation of equivalent circuit models (AWR Office)
- Simulation using 3D- FDTD software (CST Design Environment)
- Assembly of selected filter prototypes
- Comparison of simulation and test results
- Temperature and power handling performance studies of prototypes
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Primary country and city: Germany (DE) || || Rosenheim || R&D