EP 0818883 A3 19980909 - Duplex filter
Title (en)
Duplex filter
Title (de)
Duplexfilter
Title (fr)
Filtre duplex
Publication
Application
Priority
FI 962815 A 19960711
Abstract (en)
[origin: EP0818883A2] The invention relates to a radio-frequency filter with a good temperature stability and power handling capacity. The invention can be applied in the pre-stages of portable mobile telephone apparatuses, for example. The receiver branch (2) of the filter construction according to the invention employs two filter stages (3, 4), the first of which (3) attenuates the signal connected to the second filter stage, said second filter stage being a SAW filter (4). Said first filter stage (3) can be realized with a helix or dielectric resonator, for example. In a second embodiment of the invention, said first filter stage (3) is used to compensate for changes caused by the temperature dependence of the frequency response of the SAW filter (4). <IMAGE>
IPC 1-7
IPC 8 full level
H01P 1/213 (2006.01); H03H 9/02 (2006.01); H03H 9/72 (2006.01)
CPC (source: EP)
H01P 1/213 (2013.01)
Citation (search report)
- [A] EP 0614242 A1 19940907 - LK PRODUCTS OY [FI]
- [A] US 4509165 A 19850402 - TAMURA YOSHIHARU [JP]
- [A] EP 0678973 A1 19951025 - NEC CORP [JP]
- [A] PATENT ABSTRACTS OF JAPAN vol. 008, no. 229 (E - 273) 20 October 1984 (1984-10-20)
Designated contracting state (EPC)
AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
EP 0818883 A2 19980114; EP 0818883 A3 19980909; FI 962815 A0 19960711
DOCDB simple family (application)
EP 97304719 A 19970630; FI 962815 A 19960711