Abstract
A modified Marchand balun incorporating a more compact resistive phase inverter composed of lumped left-handed unit cells and resistors is proposed in this paper. By connecting the lossy phase shifter to the balanced output ports, the revised balun possesses excellent port matching and isolation properties. Implemented by a GaAs pHEMT process, the device is fabricated on-chip for demonstration. Measured return losses are better than 10 dB for all three ports and output port isolation better than 15 dB over the frequency range of 21 to 34 GHz. The magnitude and phase imbalances are less than 0.77 dB and <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$3.2^{\circ}$</tex> within the operating bandwidth. With improved performance and structural simplicity, the balun built here is applicable to many K/Ka band wireless and communication systems.
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