Low profile ceramic RF filter including trap resonators and...

Wave transmission lines and networks – Plural channel systems – Having branched circuits

Reexamination Certificate

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C333S202000, C333S206000

Reexamination Certificate

active

10550523

ABSTRACT:
A low profile ceramic filter for connection to an antenna, a transmitter and a receiver. The filter filters an incoming signal from the antenna to the receiver and an outgoing signal from the transmitter to the antenna. The filter has a ceramic core with through-holes that extend between sides of the core. The through-holes form coupled resonators and trap resonators. Two trap resonators are located at ends of the block, and two of the trap resonators are located in a central portion of the block. The coupled resonators are located between the end trap resonators and the trap resonators in the central portion. The trap resonators have a resonant frequency that is outside of the desired passband such that trap zeros or poles are provided.

REFERENCES:
patent: 5109536 (1992-04-01), Kommrusch
patent: 5929721 (1999-07-01), Munn et al.
patent: 6828883 (2004-12-01), Kitajima et al.
patent: 2003/0201848 (2003-10-01), Bloom et al.
patent: 2003/0231080 (2003-12-01), Katsumi et al.
patent: 959 518 (1999-11-01), None
patent: 1 001 479 (2000-05-01), None
patent: 1 249 887 (2000-10-01), None

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