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US 7,030,833 B2Granted
Antenna device
AssigneeDenso Corporation
InventorsKatsuhiro Ohara, Toru Yamazaki, Seishin Mikami
Life of this patent
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AssigneeDenso Corporation
InventorsKatsuhiro Ohara, Toru Yamazaki, Seishin Mikami
Estimating the term…
An antenna device includes a ground plane, a first radiation element, and a second radiation element that is entirely disposed within the first radiation element. Of the first radiation element, a portion from a first end portion to a first bending portion electromagnetically couples with, of the second radiation element, a portion from a first end portion to a first bending portion. Further, of the first radiation element, a portion from a second end portion to a second bending portion electromagnetically couples with, of the second radiation element, a portion from a second end portion to a second bending portion. This structure enables the second radiation element to be resonant with the first radiation element.
An antenna device comprising:
An antenna device comprising:
Dependencies are inferred from the claim text.
From the US filing history. Foreign family members aren’t listed.
With receiving set: used in mobile communications, e.g. GSM
Arrangements for providing operation on different wavebands: combination of fed elements with parasitic elements
Antenna arrays or systems: combinations of separate antenna units operating in different wavebands and connected to a common feeder system
Antennas, i.e. radio aerials
Term ended 7 Oct 2024 (estimated)
This application is based on and incorporates herein by reference Japanese Patent Application No. 2003-322938 filed on Sep. 16, 2003.
The present invention relates to an antenna device that is used in mobile communications devices and formed of multiple radiation elements earthed to a ground plane.
JP-2002-290138 A describes an antenna device formed of multiple radiation elements that are earthed to the ground plane. This antenna device includes a first radiation element and a second radiation element. Each of the two radiation elements includes a turnup portion so that two side portions are formed in approximately parallel with each other. Further, each of the two radiation elements includes a bending portion so that the two side portions are formed in approximately parallel with a ground plane. Further, the two radiation elements adjoin approximately parallel with each other while being grounded to the ground plane.
The above and other objects, features, and advantages of the present invention will become more apparent from the following detailed description made with reference to the accompanying drawings. In the drawings:
FIG. 1 is a schematic view of an antenna device according to a first embodiment of the present invention;
FIG. 2 is a schematic view of an antenna device according to a second embodiment of the present invention;
(First Embodiment)
An antenna device 1 according to a first embodiment will be explained with reference to FIG. 1. The antenna device 1 is formed of a ground plane 2, a first radiation element 3, and a second radiation element 4. The ground plane 2 is formed of a metal plate whose planar dimension is much larger than those of the first and second radiation elements 3, 4.
The first radiation element 3 is formed of a transmission line antenna, where a turnup portion 3c is formed in such a manner that two side portions 3a, 3b are disposed approximately parallel with each other, and a first and second end portions 3d, 3e are disposed approximately perpendicular to the surface 2a (upper surface in FIG. 1) of the ground plane 2. The first end portion 3d functions as a current feeding point, while the second end portion 3e is electrically connected to the ground plane 2. The two bending portions 3f, 3g are formed in such a manner that the two side portions 3a, 3b are disposed approximately parallel with the ground plane 2. Here, first and second leg portions 3h, 3i are defined to be from the first and second end portions 3d, 3e to the first and second bending portions 3f, 3g, respectively. Further, the first and second leg portions 3h, 3i of the first radiation element 3 have the same lengths.