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Analys och förbättringsförslag för riktkopplardesign
Linköping University, Department of Electrical Engineering.
2005 (Swedish)Independent thesis Basic level (professional degree), 20 points / 30 hpStudent thesisAlternative title
Design of a directional coupler (English)
Abstract [en]

Ericsson develops a new stripline directional coupler. Its design is described in appendix B and differs from the directional couplers Ericsson uses in current products. The new directional coupler will be used for transmission power measurement in future UMTS 3G base stations.

The most important parts of directional coupler theory are presented. It is necessary to study this theory to understand how the coupler works and how it should be designed to get good performance.

Optimal directional coupler termination component values to get high directivity and broad directivity bandwidth have been investigated.

The trim screws trim ranges have been studied.

A simple analysis of serial production performance when termination component tolerances are taken into consideration has been done.

The resistance components reactive (inductive/capacitive) characteristics at 2.14 GHz have been analyzed.

The directivity performance limitations of the directional coupler, when Ericsson’s band pass filter is connected, are investigated.

Design changes leading to better performance are proposed. Some important relations between design choices and performance are explained.

Abstract [sv]

Ericsson utvecklar en ny typ av striplineriktkopplare. Dess utformning beskrivs i appendix B och skiljer sig från de riktkopplare Ericsson använder i nuvarande produkter. Den nya riktkopplaren ska användas för uteffektmätning i framtida UMTS 3G basstationer.

De viktigaste delarna av riktkopplarteori gås igenom. Det är nödvändigt att studera teorin för att förstå riktkopplarens funktion och för att förstå hur den ska designas för att få bra prestanda.

Optimala värden på riktkopplartermineringskomponenter har laborerats fram för att få så hög direktivitet och stor direktivitets-bandbredd som möjligt.

Trimskruvarnas trimområde har kartlagts.

En enkel analys av serieproduktionsprestanda har gjorts med hänsyn till termineringskomponenternas toleranser.

Resistanskomponenternas reaktiva (induktiva/kapacitiva) karakteristik vid 2.14 GHz har undersökts.

Riktkopplarens direktivitetsprestandabegränsningar när Ericssons bandpassfilter är inkopplat utreds.

Förslag till möjliga förbättringar ges. Vissa viktiga samband mellan designval och prestanda klarläggs.

Place, publisher, year, edition, pages
Institutionen för systemteknik , 2005. , 123 p.
Keyword [en]
directional coupler, design of a directional coupler, stripline, microstrip, UMTS
Keyword [sv]
riktkopplare, riktkopplardesign, stripline, mikrostrip, UMTS
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:liu:diva-4685ISRN: LiTH-ISY-EX--05/3587--SEOAI: oai:DiVA.org:liu-4685DiVA: diva2:20700
Uppsok
teknik
Supervisors
Examiners
Available from: 2005-11-11 Created: 2005-11-11

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
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  • modern-language-association-8th-edition
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Language
  • de-DE
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