Duplexer with improved transmission/receiving band separation

Details Duplexer with improved transmission/receiving band separation Duplexer with improved transmission/receiving band separation

H - Electricity

04

B

H04B 1/52 (2006.01) H01P 1/213 (2006.01) H03H 9/64 (2006.01) H03H 9/72 (2006.01) H03H 11/34 (2006.01) H04B 1/00 (2006.01) H04B 1/40 (2006.01) H04B 1/50 (2006.01)

Patent

CA 2392833

The invention relates to a duplexer for a wireless communication system with a transmission band and a receiving band. According to the invention, a split surface wave filter consisting of at least two partial filters which cover adjacent partial frequency ranges of the corresponding band and which together form an entire band, is provided as an input and/or output filter. At least two pairs of partial filters are provided, each pair comprising a filter in the input and output filter respectively. A switch is used to switch between the at least two pairs. If the duplexer interval remains the same, a greater band interval is created between the transmission and receiving bands or between the corresponding partial frequency ranges, said band interval being produced with surface wave filters.

L'invention concerne un commutateur émission/réception d'un système de radiocommunication présentant une bande émission et une bande réception. Selon l'invention, on utilise comme filtre d'entrée et/ou de sortie un filtre à ondes acoustiques de surface fractionné qui est composé d'au moins deux filtres partiels qui couvrent des domaines fréquentiels partiels adjacents de la bande correspondante et se complètent pour former la totalité de la bande. Au moins deux paires de filtres partiels comprennent respectivement un filtre dans le filtre d'entrée et de sortie. Un commutateur permet de procéder à une commutation entre les deux paires ou plus. Pour une distance constante entre les signaux émission et les signaux réception du commutateur émission/réception, on peut créer une largeur de bande interdite plus grande entre la bande émission et la bande réception, notamment entre les domaines fréquentiels partiels, cette largeur de bande étant réalisable avec des filtres à ondes acoustiques de surface.

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