| US 7,605,676 B2 | ||
| Directional coupler | ||
| Jurek Dabrowski, Täby (Sweden); and Andrzej Sawicki, Märsta (Sweden) | ||
| Assigned to Telefonaktiebolaget LM Ericsson (publ), Stockholm (Sweden) | ||
| Appl. No. 10/554,416 PCT Filed Apr. 20, 2004, PCT No. PCT/SE2004/000603 § 371(c)(1), (2), (4) Date Jan. 10, 2006, PCT Pub. No. WO2004/097974, PCT Pub. Date Nov. 11, 2004. |
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| Claims priority of application No. PCT/SE03/00671 (WO), filed on Apr. 25, 2003. | ||
| Prior Publication US 2006/0284700 A1, Dec. 21, 2006 | ||
| Int. Cl. H01P 5/18 (2006.01) | ||
| U.S. Cl. 333—116 [333/117] | 10 Claims |
| 1. A directional coupler comprising:
coupled lines including a first line and a second line, and
at least one ground plane,
wherein at least one of the ground planes is a tuning ground plane and a distance, between the first line and the second line
and each distance between the first line and the respective tuning ground plane are adapted so as to contribute to a desired
coupling level under compensation conditions,
wherein an electrical length of the directional coupler is a quarter or less of length of a wave propagated in the directional
coupler, and
wherein a region between the first and the second lines comprises at least partly a gas, and at least one dielectric layer
is arranged between the second line and the at least one tuning ground plane, whereby each distance between the first line
and the respective tuning ground plane is dependent on the respective distance between each tuning ground plane and a boundary
between the gas and the dielectric layer.
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