Analysis and design of complex impedance transforming marchand baluns

Rasmus Schandorph Michaelsen, Tom Keinicke Johansen, Kjeld M. Tamborg

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Abstract

A new type of Marchand balun is presented in this paper, which has the property of complex impedance transformation. To allow the Marchand balun to transform between arbitrary complex impedances, three reactances should be added to the circuit. A detailed analysis of the circuit gives the governing equations. To verify the theory, a design and electromagnetic simulation of a lumped element Marchand balun is made in a SiGe BiCMOS technology. The lumped element impementation is favorable because capacitors are placed where the additional reactances should be added. Thus it is possible to absorb a positive reactance by reducing a capacitor. At the design frequency of 10.5 GHz it matches 50Ω to 50 - j66Ω. It has an insertion loss of 5.1 dB, an input reflection of −20.8 dB, as well as phase and magnitude imbalance better than 0.2° and 0.12 dB, respectively.
Original languageEnglish
Title of host publicationProceedings of 2014 20th International Conference on Microwaves, Radar, and Wireless Communications
Number of pages4
PublisherIEEE
Publication date2014
ISBN (Print)9786176075530
DOIs
Publication statusPublished - 2014
Event2014 20th International Conference on Microwaves, Radar, and Wireless Communications - Mercure Hotel, Gdansk, Poland
Duration: 16 Jun 201418 Jun 2014

Conference

Conference2014 20th International Conference on Microwaves, Radar, and Wireless Communications
LocationMercure Hotel
Country/TerritoryPoland
CityGdansk
Period16/06/201418/06/2014

Keywords

  • Aerospace
  • Communication, Networking and Broadcast Technologies
  • Components, Circuits, Devices and Systems
  • Fields, Waves and Electromagnetics
  • Photonics and Electrooptics
  • Signal Processing and Analysis
  • Balun
  • Capacitors
  • Complex impedance transformation
  • Impedance
  • Impedance matching
  • Integrated circuit modeling
  • Marchand balun
  • Mathematical model
  • Microwave theory and techniques
  • MMIC
  • Ports (Computers)

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