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Planar Probe Coaxial-Waveguide Power Combiner/Divider

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2 Author(s)
Kaijun Song ; Dept. of Electron. Eng., City Univ. of Hong Kong, Hong Kong, China ; Quan Xue

A novel axially symmetric oversized coaxial waveguide power combiner/divider, which utilizes a planar probe array to transform multiway input to a central oversized coaxial waveguide, is presented in this paper. The use of a coaxial waveguide allows standard transverse electromagnetic design theory to be used, and the characteristics of the coaxial taper transition and the planar probe array are analyzed in detail. A design procedure is also established for the structure. A ten-way planar probe coaxial-waveguide power combiner/divider over the Ku-band is designed and measured. The measured results show a reasonable agreement with the simulated results. The measured 15-dB return-loss bandwidth is approximately 4.3 GHz, and a maximum amplitude imbalance of plusmn 1 dB and a phase imbalance of plusmn5deg are observed in the 11.5-16-GHz band. Furthermore, the isolation between the peripheral ports is also discussed.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:57 ,  Issue: 11 )