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Balun bandpass filter based on multilayer substrate integrated waveguide power divider

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3 Author(s)
J. N. Hui ; School of Electronic and Optical Engineering, Nanjing University of Science & Technology, Nanjing 210094, People's Republic of China ; W. J. Feng ; W. Q. Che

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 )