Compact planar magic-T Based on the Double-Sided Parallel-Strip Line and the Slotline Coupling

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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  • Wenjie Feng
  • Quan Xue
  • Wenquan Che


Original languageEnglish
Article number5597965
Pages (from-to)2915-2923
Journal / PublicationIEEE Transactions on Microwave Theory and Techniques
Issue number11 PART 1
Publication statusPublished - Nov 2010


Two compact planar magic-T structures implemented on the double-sided parallel-strip line (DSPSL) and the slotline coupling are proposed and demonstrated. Due to a metallic ground inserted into the middle of the substrate for the double-sided parallel-strip line, the E-plane DSPSL power divider thus shows an intrinsic 180° out-of-phase characteristic between the two input/output ports. A transition between slotline and DSPSL is utilized to realize the H-plane input/output port of the magic-T. The equivalent circuits are derived for the design of the proposed planar multilayer magic-T. Good agreement between the measured and simulated results indicates that the fractional bandwidths for the two planar magic-T structures are 42.8% and 43.8%, respectively, while the amplitude and phase imbalance are less than 0.22 dB and 1.5° . © 2006 IEEE.

Research Area(s)

  • Double-sided parallel-strip line, equivalent circuit, fractional bandwidth (FBW), planar magic-T, slotline