Arrangement for matching and tuning a surface acoustic wave...

Details Arrangement for matching and tuning a surface acoustic wave... Arrangement for matching and tuning a surface acoustic wave...

H - Electricity

03

H

H03H 9/48 (2006.01) H03H 7/42 (2006.01) H03H 9/145 (2006.01) H03H 9/64 (2006.01)

Patent

CA 2180172

The present invention relates to an arrangement for matching and tuning the impedance of a high frequency surface acoustic wave (SAW) filter (3) to the characteristic impedance of an external system. The arrangement include a power divider/combiner (9,10) with 180 degrees phase difference between the two output ports of the divider - or input ports of the combiner - and adjustable capacitor means (15,24) installed between the power divider/combiner (9,10) and the SAW-filter (3). The arrangement may be a microstrip network where the powerdivider/combiner includes a Wilkinson-divider (9,10) in combination with a 180 degrees phase-shift (11,12) between the output arms (13,14;20,21) of the divider (9,10)

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