Duplex unit using surface wave bandpass filter

The duplex unit has two acoustic surface wave filter chips with different pass band average frequencies. The unit also has a phase adaptation circuit for adjusting the phases of the two filter chips. The filter chips and the phase adjustment circuit are combined in a unit. In the unit the phase adju...

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Bibliographic Details
Main Authors IKATA, OSAMU, KAWASAKI, KANAGAWA, JP, SATOH, YOSHIO, KAWASAKI, KANAGAWA, JP
Format Patent
LanguageEnglish
German
Published 23.04.1998
Edition6
Subjects
BASIC ELECTRIC ELEMENTS
BASIC ELECTRONIC CIRCUITRY
CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS
ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS
MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
PRINTED CIRCUITS
RESONATORS
SEMICONDUCTOR DEVICES
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Summary:The duplex unit has two acoustic surface wave filter chips with different pass band average frequencies. The unit also has a phase adaptation circuit for adjusting the phases of the two filter chips. The filter chips and the phase adjustment circuit are combined in a unit. In the unit the phase adjustment circuit is formed in a layer which provides a hollow chamber for the acoustic surface wave filter chip. The layer defining the chamber is arranged to fasten the acoustic surface wave filter chip. The layer defining the chamber may have a contact terminal layer below which is arranged an earthing layer. This layer has separate patterns for the individual surface acoustic waves.
Bibliography:Application Number: DE19971012065