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Combined differential and common-mode analysis of power splitters and combiners

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2 Author(s)
Bockelman, D.E. ; Motorola Radio Products Appl. Res., Plantation, FL, USA ; Eisenstadt, W.R.

Power splitter/combiner phase and magnitude imbalance is analyzed in terms of simultaneous orthogonal modes of propagation. These simultaneous modes are defined as differential and common-mode. A new measure of splitter imbalance is suggested in the common-mode rejection ratio (CMRR). Measured response of a 180° hybrid splitter is represented in terms of the differential and common-mode responses, and the CMRR is calculated. Combiner imbalance is also analyzed in terms of differential and common-mode responses, and response metrics are suggested. Analytical expressions for CMRR of several common splitters is given as functions of phase and magnitude imbalance

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:43 ,  Issue: 11 )