An extremely compact Q-band three-conductors balun is presented. The proposed structure exploits the increased line-to-line coupling to improve bandwidth and impedance transformation. Furthermore the insertion of open-ended stubs makes the circuit suitable for EHF mixer application. The balun operates in the 38-50 GHz range with a typical 1-dB amplitude error and 10 degrees phase unbalance. (C) 2016 Wiley Periodicals, Inc.
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