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Micro-strip to waveguide transition with integrated coupler
University of Borås, School of Engineering.
2008 (English)Independent thesis Basic level (degree of Bachelor)Student thesis
Abstract [en]

The purpose of this project is to examine a novel approach for coupling RF-power from a transmitter chain in a MiniLink radio. The coupling is achieved by inserting a probe into the microstrip to waveguide transition of the radio. The main purpose of the coupler is to be used for decoupling of output power to an external detector. Today the RF-detector is often placed on the PA chip, this is limiting the number of designs available on the market for HighPower versions of radios. Also an off chip coupler before the waveguide transition will have the drawback of higher insertion loss and also by larger dimensions. An alternative use of the coupler could be to design an RF-loop channel from Tx to Rx in a radio. Simulations in Ansoft HFSS and ADS have been used for designing and testing the tolerance of the design for product variations on the 23 GHz waveguide. Two different designs are handled in this report, one where the probe for coupling of output power is placed where the force is as strongest and one where the probe is placed where it is preferable considering the design on the rest of circuit board. Both designs were drawn and simulated in HFSS with satisfying results. A design that meets the requirements was created by simulations. First, simulations were made for establishing what variables that affect the interesting outcome values such as coupling level between probe and u-strip, insertion loss et cetera, then an optimize simulation was made to get the best values on those variables. The consequence of lack of directivity was examined with ADS also here with a satisfying result.

Place, publisher, year, edition, pages
University of Borås/School of Engineering , 2008.
Series
Kandidatuppsats
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:hb:diva-19027Local ID: 2320/3888OAI: oai:DiVA.org:hb-19027DiVA, id: diva2:1310961
Note
Uppsatsnivå: CAvailable from: 2019-04-30 Created: 2019-04-30

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
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More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
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