Thesis (MEng) -- Stellenbosch University, 2002. / ENGLISH ABSTRACT: The tuning of coupled-resonator filters is an essential part of its production. It is, however, a time
consuming and expensive process. The use of model-based parameter extraction algorithms as a
semi-automated tuning procedure is examined.
This thesis describes the development of such a procedure. Different models for the filter are
compared. The extraction algorithm is based on the least squares method. A more robust
procedure is presented which makes the parameter extraction possible, without the availability of
good starting values.
The algorithm is evaluated using a fourth order single mode direct coupled cavity filter with a
centre frequency of 10GHz. The algorithm produces good results and makes the tuning of this type
of filter possible in an effective way. It also allows for the diagnosis of the filter, which is a great
advantage over the more conventional direct tuning methods. / AFRIKAANSE OPSOMMING: Die instelling van gekoppelde-resoneerderfilters is ’n essensiele deel van die vervaardiging
daarvan. Dit is egter ’n tydsame en duur proses. Die gebruik van modelgebaseerde
parameteronttrekking as ’n semi-geoutomatiseerde instellingsproses is ondersoek.
Hierdie tesis beskryf die ontwikkeling van so ’n prosedure. Verskillende modelle vir die filter is
vergelyk. Die onttrekkingsalgoritme is gebaseer op die kleinste-kwadraatmetode. ’n Meer
robuuste metode word voorgestel wat die parameteronttrekking moontlik maak, sonder dat daar
goeie beginwaardes beskikbaar is.
Die algoritme word geevalueer aan die hand van ’n vierde orde enkelmodus direkgekoppelderesoneerderfilter
met ’n senterfrekwensie van 10GHz. Die algoritme lewer goeie resultate en maak
die instelling van hierdie tipe filter moontlik op ’n effektiewe wyse. Die metode kan ook gebruik
word vir die diagnose van die filter wat ’n groot voordeel is bo meer konvensionele direkte
instellingsmetodes.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:sun/oai:scholar.sun.ac.za:10019.1/53029 |
| Date | 03 1900 |
| Creators | Van der Colff, A. P. E. |
| Contributors | Meyer, P., Van Niekerk, C., Stellenbosch University. Faculty of Engineering. Dept. of Electrical and Electronic Engineering. |
| Publisher | Stellenbosch : Stellenbosch University |
| Source Sets | South African National ETD Portal |
| Language | af_ZA |
| Detected Language | Unknown |
| Type | Thesis |
| Format | 134 p. : ill. |
| Rights | Stellenbosch University |
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