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Balun bandpass filter based on multilayer substrate integrated waveguide power divider

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3 Author(s)
Hui, J.N. ; Sch. of Electron. & Opt. Eng., Nanjing Univ. of Sci. & Technol., Nanjing, China ; Feng, W.J. ; Che, W.Q.

A compact multilayer substrate integrated waveguide (SIW) balun bandpass filter is proposed. A 180° reverse phase characteristic between the input/output ports can be easily achieved by the middle metal-ground of the SIW power divider. Four inductive posts are added to the multilayer SIW power divider to realise a passband. Good in-band balance performance (amplitude and phase imbalance are less than 0.35°dB and 2°) over the passband are achieved for the balun bandpass filter.

Published in:

Electronics Letters  (Volume:48 ,  Issue: 10 )