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Synthesis and design of narrowband bandpass filters in waveguide technique

: Reible, S.; Herschel, R.; Brauns, R.; Nüßler, D.; Pohl, N.


Institute of Electrical and Electronics Engineers -IEEE-:
10th German Microwave Conference, GeMIC 2016. Proceedings : 14-16 March 2016, Bochum, Germany
Piscataway, NJ: IEEE, 2016
ISBN: 978-1-4673-9887-9
ISBN: 978-3-9812668-7-0
German Microwave Conference (GeMiC) <10, 2016, Bochum>
Conference Paper
Fraunhofer FHR ()

The design and realisation of a high order bandpass filter for millimetre wave signals is presented. It is purely based on split-block hollow-metal waveguide technology. The synthesis process starting at the equivalent lowpass filter is demonstrated, involving the use of K-inverters and equivalent circuits for waveguide discontinuous. This results in a compact iris filter with less than 1.2GHz bandwidth at 94GHz and more than 40 dB suppression at 0.5 GHz offset while the insertion loss is kept as low as 3 dB. The design is verified by EM simulation and experimental characterisation of a manufactured prototype to underline the potential of the filter for innovative system design in the millimetre wave range.