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US 7,843,394 B2Granted
Radio antenna unit and mobile radio device equipped with the same
AssigneePanasonic Corporation
InventorsKiyoshi Egawa, Yoshio Koyanagi, Hiroshi Haruki
Life of this patent
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AssigneePanasonic Corporation
InventorsKiyoshi Egawa, Yoshio Koyanagi, Hiroshi Haruki
Estimating the term…
A multi-band antenna can be realized by using a common antenna element with a simple configuration. A radio antenna unit includes a ground conductor plate 1 provided to a casing of a radio device and having a ground potential, a first radio circuit 2 handling a system in a first frequency band and a second radio circuit 3 handling a system in a second frequency band lower than the first frequency band, which are provided in the ground conductor plate 1, a first feeding line 4 connected to the first radio circuit 2 and being a coaxial transmission line having an outer conductor 5 that is arranged along the ground conductor plate 1, an antenna element 6 connected to the first feeding line 4 and the outer conductor 5 respectively, and arranged along the ground conductor plate 1, and a second feeding line 7 for connecting the second radio circuit 3 and the outer conductor 5, wherein the first feeding line 4 feeds a high frequency power input from the first radio circuit 2 and the second feeding line 7 feeds a high frequency power input from the second radio circuit 3.
A radio antenna unit, comprising:
A radio antenna unit, comprising:
Dependencies are inferred from the claim text.
Drawings are temporarily unavailable. Open the PDF at USPTO
From the US filing history. Foreign family members aren’t listed.
Antenna arrays or systems: combinations of different interacting antenna units for giving a desired directional characteristic
Used in mobile communications, e.g. GSM: specially adapted for hand-held use
Substantially flat resonant element parallel to ground plane, e.g. patch antenna: with a shorting wall or a shorting pin at one end of the element
Resonant antennas: with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
About 4 months of term left · ends 5 Mar 2027 (estimated)
The present invention relates to a radio antenna unit used in a mobile radio device and, more particularly, a multi-band radio antenna unit for transmitting/receiving a radio in a plurality of systems and a mobile radio device equipped with the same.
Out of the antenna units used in the radio capable of handling multiple bands in the prior art, there is the antenna unit that a feeding point is constructed in a mode of multiple coaxial lines and another coaxial line is connected to the outer conductor, and then the transmitter/receiver is connected to the transmitting/receiving antennas via each center conductor respectively (see Patent Literature 1, for example).
A configurative view of a multi-band antenna in the prior art is shown in FIG. 21. A reference numeral 1 is a ground conductor plate 1, 2 is a first radio circuit, 3 is a second radio circuit 3, 21 is an upper antenna element, 22 is a center conductor, 23 is a lower antenna element, 24, 25, 26 are outer conductors, and 27 is a center conductor of another coaxial line.
FIG. 1 A configurative view of a radio antenna unit according to a first embodiment of the present invention.
FIG. 2 A current distribution chart in a first frequency band according to the first embodiment of the present invention.
FIG. 3 An operating principle view in the first frequency band according to the first embodiment of the present invention.
1 ground conductor plate 2 first radio circuit 3 second radio circuit 4 first feeding line 5 outer conductor 6 antenna element 7 second feeding line 8 upper case 9 lower case 10 flip 11 retractable element 12 switching element 13 switching deciding portion 14 reactance element for a second frequency band 15 antenna selecting switch 16 feeding line changing switch 17 reactance element for a first frequency band 18 third feeding line 19 matching circuit 20 parasitic element
A radio antenna unit and a mobile radio device equipped with the same according to embodiments of the present invention will be explained hereinafter.
A radio antenna unit according to a first embodiment of the present invention will be explained in detail with reference to the drawings hereunder.