US 7,321,278 B2
Low profile ceramic RF filter including trap resonators and a decoupler
Reddy Vangala, Albuquerque, N. Mex. (US)
Assigned to CTS Corporation, Elkhart, Iowa (US)
Appl. No. 10/550,523
PCT Filed Apr. 07, 2004, PCT No. PCT/US2004/010526
§ 371(c)(1), (2), (4) Date Sep. 22, 2005,
PCT Pub. No. WO2004/093239, PCT Pub. Date Oct. 28, 2004.
Claims priority of provisional application 60/460970, filed on Apr. 07, 2003.
Prior Publication US 2006/0192634 A1, Aug. 31, 2006
Int. Cl. H01P 1/213 (2006.01); H01P 1/205 (2006.01)
U.S. Cl. 333—134  [333/202; 333/206] 12 Claims
OG exemplary drawing
 
3. An antenna duplexer comprising:
a dielectric block having a first, a second and a third set of paired opposed sides and a central portion;
a first and a second antenna coupling electrode located on the dielectric block in the central portion;
a first section of the block extending between the first antenna electrode and a first end of the block;
a second section of the block extending between the second antenna electrode and a second end of the block, the second end opposing the first end,
each of the first and second sections having a plurality of coupled resonators extending between the first set of paired opposed sides, the plurality of coupled resonators being defined by a plurality of metallized through-holes extending between the first set of paired opposed sides;
a decoupler located in the central portion of the dielectric block and being defined by one of the plurality of metallized through-holes extending between the first set of paired opposed sides, the decoupler further being located between the first and second antenna coupling electrodes; and
a relatively expansive metallized area located on the block for providing a reference potential, the block further comprising a metallization extension on one of the sides of the first set of paired opposed sides, the metallization extension extending between the decoupler and the relatively expansive metallized area.