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A Planar Magic-T Structure Using Substrate Integrated Circuits Concept and Its Mixer Applications

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5 Author(s)
Fan Fan He ; Dept. of Electr. Eng., Ecole Polytech. de Montreal, Montreal, QC, Canada ; Ke Wu ; Wei Hong ; Liang Han
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In this paper, a planar 180 phase-reversal T-junction and a modified magic-T using substrate integrated waveguide (SIW) and slotline are proposed and developed for RF/microwave applications on the basis of the substrate integrated circuits concept. In this case, slotline is used to generate the odd-symmetric field pattern of the SIW in the phase-reverse T-junction. Measured results indicate that 0.3-dB amplitude imbalance and 3 phase imbalance can be achieved for the proposed 180 phase-reversal T-junction over the entire -band. The modified narrowband and optimized wideband magic-T are developed and fabricated, respectively. Measured results of all those circuits agree well with their simulated ones. Finally, as an application demonstration of our proposed magic-T, a singly balanced mixer based on this structure is designed and measured with good performances.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:59 ,  Issue: 1 )