Antenna device and radio communication apparatus
AssigneeSony Ericsson Mobile Communications Japan, Inc.
InventorsToru OZONE, Hideaki Shoji
Life of this patent
Estimating the term…
Abstract
An antenna device that includes an antenna having a single feed and a shunt circuit. The shunt circuit includes a first shunt matching circuit causing impedance, viewed from a main path connecting the antenna and a radio frequency circuit, to be substantially infinite with respect to all frequency ranges handled by the antenna, and a second shunt matching circuit providing a predetermined impedance characteristic with respect to a first subset of the frequency ranges handled by the antenna. Each of the first and second shunt matching circuits are selectively connected to the main path, and a selection controller of the antenna device controls selection of which of the first and second shunt matching circuits are connected to the main path.
Claims17
An antenna device comprising:
- an antenna having a single feed;
- a shunt circuit including:
- a first shunt matching circuit configured to cause impedance, viewed from a main path connecting the antenna and a radio frequency circuit, to be substantially infinite with respect to all frequency ranges handled by the antenna;
- and
- a second shunt matching circuit configured to provide a predetermined impedance characteristic with respect to a first subset of the frequency ranges handled by the antenna,
- wherein a first end of each of the first and second shunt matching circuits are connected to ground, and a second end of each of the first and second shunt matching circuits are selectively connected to the main path;
- and
- a selection controller configured to control selection of which of the first and second shunt matching circuits are connected to the main path.
A radio communication apparatus comprising:
- an antenna device including:
- an antenna having a single feed;
- a shunt circuit including:
- a first shunt matching circuit configured to cause impedance, viewed from a main path connecting the antenna and a radio frequency circuit, to be substantially infinite with respect to all frequency ranges handled by the antenna;
- and
- a second shunt matching circuit configured to provide a predetermined impedance characteristic with respect to a first subset of the frequency ranges handled by the antenna,
- wherein a first end of each of the first and second shunt matching circuits are connected to ground, and a second end of each of the first and second shunt matching circuits are selectively connected to the main path;
- and
- a selection controller configured to control selection of which of the first and second shunt matching circuits are connected to the main path.
An antenna device comprising:
- an antenna having a single feed;
- a shunt circuit including:
- means for causing impedance, viewed from a main path connecting the antenna and a radio frequency circuit, to be substantially infinite with respect to all frequency ranges handled by the antenna;
- and
- means for providing a predetermined impedance characteristic with respect to a first subset of the frequency ranges handled by the antenna,
- wherein the means for causing and means for providing are selectively connected to the main path;
- and
- means for controlling selection of which of the means for providing and means for causing are connected to the main path.
Dependencies are inferred from the claim text.