| US 7,522,022 B2 | ||
| Planar filter, semiconductor device and radio unit | ||
| Atsushi Yamada, Tenri (Japan) | ||
| Assigned to Sharp Kabushiki Kaisha, Osaka (Japan) | ||
| Appl. No. 10/535,948 PCT Filed Nov. 18, 2003, PCT No. PCT/JP03/14617 § 371(c)(1), (2), (4) Date May 24, 2005, PCT Pub. No. WO2004/049495, PCT Pub. Date Jun. 10, 2004. |
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| Claims priority of application No. P2002-340506 (JP), filed on Nov. 25, 2002; and application No. P2003-359073 (JP), filed on Oct. 20, 2003. | ||
| Prior Publication US 2006/0164188 A1, Jul. 27, 2006 | ||
| Int. Cl. H03H 7/00 (2006.01); H01P 3/08 (2006.01) | ||
| U.S. Cl. 333—204 [333/185; 333/219; 333/246] | 8 Claims |
| 1. A planar filter, comprising:
a first U-shaped open transmission line resonator;
a second U-shaped open transmission line resonator; and
a crank-shaped open transmission line resonator having a middle portion and first and second end portions at opposing ends
of the middle portion, the first end portion being bent at substantially a right angle with respect to the middle portion
to extend in a first direction from the middle portion and the second end portion being bent at substantially a right angle
with respect to the middle portion to extend in a second direction from the middle portion, opposed to the first direction.
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