Ceramic duplex filter

Details Ceramic duplex filter Ceramic duplex filter

H - Electricity

03

H

H03H 9/46 (2006.01) H01P 1/205 (2006.01) H01P 1/213 (2006.01) H03H 9/24 (2006.01)

Patent

CA 2065531

Abstract Previously it was not possible to realize a ceramic duplex filter using a single monolithic ceramic block, because the isolation between the transmitter branch and the receiver branch could not be made sufficiently high. A duplex filter (1) can be realized in ~ single ceramic block by making, be- tween its filters (A and B), a strip like area (9) on the non-coated surface (5) of the ceramic block, due to which the electric and magnetic coupling between the resonators (R4, T1) of filters (A and B) on each side of the area can be adjusted to almost zero. This "electric partition" (9) provides a sufficient isolation between the filters of each branch.

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