Ceramic duplex filter

Details Ceramic duplex filter Ceramic duplex filter

1992-03-31

1993-08-24

Pascal, Robert J.

Wave transmission lines and networks

Plural channel systems

Having branched circuits

333206, 455 82, H01P 1205, H04B 148

Patent

active

052392791

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 a single ceramic block by making, between 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 (R.sub.4, T.sub.1) 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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