| US 7,457,651 B2 | ||
| Dual mode filter based on smoothed contour resonators | ||
| Luciano Accatino, Turin (Italy); and Giorgio Bertin, Turin (Italy) | ||
| Assigned to Telecom Italia S.p.A., Milan (Italy); and Pirelli & C. S.p.A., Milan (Italy) | ||
| Appl. No. 10/573,891 PCT Filed Sep. 30, 2003, PCT No. PCT/EP03/10825 § 371(c)(1), (2), (4) Date Mar. 29, 2006, PCT Pub. No. WO2005/041345, PCT Pub. Date May 06, 2005. |
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| Prior Publication US 2007/0035358 A1, Feb. 15, 2007 | ||
| Int. Cl. H01P 1/203 (2006.01); H01B 12/02 (2006.01) | ||
| U.S. Cl. 505—210 [333/204; 333/219; 333/99 S] | 19 Claims |
| 1. A planar filter comprising a planar resonator including:
a conductive region supporting a first resonating mode propagating along a first conductive path, said conductive region being
a smoothed contour shaped region; and
a conductor-free region disposed in said conductive region, said conductor-free region being a smoothed contour shaped region
symmetrically disposed along a region axis, the region axis having an angle θ with respect to said first conductive path,
and the angle θ being an odd multiple of 45°.
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