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J Electromagn Eng Sci > Volume 17(2); 2017 > Article
Journal of Electromagnetic Engineering and Science 2017;17(2):65-70.
DOI: https://doi.org/10.5515/JKIEES.2017.17.2.65   
Design of A Compact Single-Balanced Mixer for UWB Applications
Wahab Mohyuddin1, In Bok Kim2, Hyun Chul Choi1, Kang Wook Kim1
1School of Electronics Engineering, Kyungpook National University
2LIGNex1 Co. Ltd.
Correspondence:  Kang Wook Kim,Email: kang_kim@ee.knu.ac.kr
Abstract
The design and implementation aspects of a new single-balanced mixer for ultra-wideband (UWB) applications are presented in this study. The proposed mixer utilizes a miniaturized UWB ring coupler as a balun, consisting of a pair of in-phase and inverted-phase transitional structures. The well-balanced UWB performance of the ring coupler, aside from the optimized diode matching, results in improved conversion loss and inter-port isolations for a wide bandwidth. The size of the implemented single-balanced diode mixer is reduced to about 60% of the area of the conventional single-balanced ring diode mixer. The measured results of the proposed mixer exhibit an average conversion loss of 7.5 dB (minimum 6.7 dB) and a port-to-port isolation of greater than 18 dB over a UWB frequency range of 3.1-10.6 GHz. The measured results agree well with the simulated results.
Key words: Planar Transitions, Ring Coupler, Schottky Diode, Single-Balanced Mixer, Ultra-Wideband

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