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Explicit design of remote‐tuned combiner for GSM and WCDMA signals
Author(s) -
Rhodes J. D.,
Mobbs C. I.
Publication year - 2007
Publication title -
international journal of circuit theory and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.364
H-Index - 52
eISSN - 1097-007X
pISSN - 0098-9886
DOI - 10.1002/cta.429
Subject(s) - gsm , w cdma , code division multiple access , electronic engineering , antenna (radio) , computer science , amplitude , topology (electrical circuits) , electrical engineering , engineering , telecommunications , physics , quantum mechanics
The problems associated with combining multiple GSM carriers and WCDMA signals onto a single antenna are developed leading to a unique solution. This solution is based upon the concept of cascading directional filters to meet the electrical requirements, which may readily be tuned electrically leading to remote‐tuned products capable of injecting one or more WCDMA channels into the same communication band as several GSM carriers. A particular solution is presented, which exhibits both optimum amplitude and group delay characteristics for the WCDMA signal. Closed‐form expressions are given for the network functions including the amplitude and group delay characteristics. By developing techniques similar to those used in Rhodes ( Theory of Electrical Filters . Wiley: New York, 1976), explicit formulas for element values in the general 2 n th degree network are given and proved. A practical operating unit for the US cellular band has been designed and constructed. Measured per‐ formance is given and shows excellent agreement with theory. Copyright © 2007 John Wiley & Sons, Ltd.