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A Modified Marchand Balun Configuration With Tunable Phase Balance

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4 Author(s)
Michaelsen, R. ; Electromagn. Syst. group, Tech. Univ. of Denmark, Lyngby, Denmark ; Johansen, T. ; Tamborg, K. ; Zhurbenko, V.

In this letter, a novel modified Marchand balun configuration with tunable phase balance is analyzed and verified experimentally. It is proposed to add a shunt susceptance in between the two couplers of the Marchand balun. This allows for a change in the phase balance which, to first order, is linear with the susceptance, while the magnitude balance is kept constant. To verify the proposed configuration, a lumped element Marchand balun has been fabricated using a SiGe BiCMOS technology. The balun design is centered around 9.4 GHz, with an insertion loss of 6.0 dB. The phase difference between the output ports can be changed from 175.8° to 183 ° whereas the magnitude imbalance is kept almost constant at 0.3 dB. The balun performs well in the range from 7 to 11 GHz, where it is possible to tune the phase to exactly 180°.

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:23 ,  Issue: 2 )