Antenna device and radio apparatus capable of multiband...

Details Antenna device and radio apparatus capable of multiband... Antenna device and radio apparatus capable of multiband...

2007-11-20

2007-11-20

Nguyen, Hoang V. (Department: 2821)

Communications: radio wave antennas

Antennas

With radio cabinet

C343S7000MS

Reexamination Certificate

active

11499558

ABSTRACT:
An antenna device and a radio apparatus are provided. The antenna device is configured to be coupled to a feeding point of the radio apparatus. The antenna device has a first antenna element and a second antenna element. The first antenna element is configured to be an unbalanced-fed antenna fed at the feeding point to resonate at a first frequency. The second antenna element is configured to be a monopole antenna having an open end and to be fed at the feeding point. The first antenna element and the second antenna element have a common portion from the feeding point to a branching point. The second antenna element is configured to be ungrounded in a first state to resonate at a second frequency lower than the first frequency and to be grounded in a second state at a switch point between the branching point and the open end.

REFERENCES:
patent: 2004/0246179 (2004-12-01), Chen et al.
patent: 2006/0050007 (2006-03-01), Min
patent: 2006/0152419 (2006-07-01), Sato et al.
patent: 2006/0262015 (2006-11-01), Thornell-Pers et al.
patent: 2001-136019 (2001-05-01), None
patent: 2003-46318 (2003-02-01), None
patent: 2004-40596 (2004-02-01), None
Sekine, S. and Shoki, H., “Characteristics of T-type Monopole Antenna with Parallel Resonance Mode”, IEICEJ, Trans. vol. J86-B, No. 2, pp. 200-208, Feb. 2003 (in Japanese).

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