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HyungSuk Yoo, Se-Hee Lee, Hongjoon Kim, "Broadband Balun For MMIC Application," Microwave and Optical Technology Letters, 2012. Abstract
We present a compact and broadband balun based on the concept of a synthetic left-handed transmission line and right-handed transmission line.The compact balun uses lumped, discrete LC elements only to reduce the circuit size dramatically. For the frequency range of 0.6–1.2 GHz, this circuit maintains 180 ± 9.5° phase difference at the outputs, whereas the maximum insertion loss is −1.78 dB, and the minimum return loss is −10.2 dB at all three ports, yet the circuit size is merely 12 × 8 mm2. As far as we know, this is the smallest broadband balun reported in the literature, and the size can be further reduced, if the circuit is made with a monolithic microwave integrated circuit technology.
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