| US 7,535,314 B2 | ||
| Line transition device, high-frequency module, and communication apparatus | ||
| Atsushi Saitoh, Komatsu (Japan) | ||
| Assigned to Murata Manufacturing Co., Ltd., Kyoto-fu (Japan) | ||
| Filed on Feb. 15, 2008, as Appl. No. 12/32,175. | ||
| Application 12/032175 is a continuation of application No. PCT/JP2006/316356, filed on Aug. 22, 2006. | ||
| Claims priority of application No. 2005-243589 (JP), filed on Aug. 25, 2005. | ||
| Prior Publication US 2008/0136550 A1, Jun. 12, 2008 | ||
| Int. Cl. H01P 5/107 (2006.01) | ||
| U.S. Cl. 333—26 [333/248] | 9 Claims |
| 1. A line transition device comprising:
a conductor block;
a waveguide provided in the conductor block;
a microstrip line including:
a dielectric substrate having a first and a second surface;
a line conductor disposed on the first surface of the dielectric substrate;
a ground conductor disposed on the second surface of the dielectric substrate, the second surface including a region where
the ground conductor is not provided; and
a coupling conductor formed at an end of the line conductor and opposite the region where the ground conductor is not provided,
the coupling conductor being positioned at a terminal end of the waveguide and inside the waveguide,
the conductor block having a choke groove located at a position facing the ground conductor and surrounding the terminal end
of the waveguide at a predetermined distance therefrom; and
a slit-like no-ground-conductor-formed part extending from the region where the ground conductor is not provided and near
a boundary between the coupling conductor and the microstrip line.
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