Modified microstrip filters improving the suppression performance of harmonic signals
- 27 August 2003
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- Vol. 1, 539-542 vol.1
- https://doi.org/10.1109/mwsym.2003.1210995
Abstract
In this paper, a new parallel-coupled-line microstrip BPF (Band-pass Filter) improving the suppression performance of 2/sup nd/ harmonic signals is described. Using the consecutive patterns in a coupled-line, the desired passband performance is improved and harmonic passband signal is diminished. Recalculation of design parameters(space-gap between lines, line widths and lengths) of conventional filters is not required because, after using the conventional design methodology for parallel-coupled-line BPF, new filters can be easily realized by inserting periodic patterns in coupled-line. To evaluate the validity of this novel technique, order-3 Butterworth BPF centered at 2.5 GHz with a 10% FBW (Fractional Bandwidth) and order-5 Chebyshev BPF centered at 10 GHz with it 15% FBW were used. When five and three square grooves are used, over 30 dB suppression at 2/sup nd/ harmonic is achieved in simulation and experiment.Keywords
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