Radio apparatus

Details Radio apparatus Radio apparatus

2006-11-14

2006-11-14

Phan, Tho (Department: 2821)

Communications: radio wave antennas

Antennas

With radio cabinet

Reexamination Certificate

active

07136022

ABSTRACT:
There is provided a radio apparatus usable in a frequency band of use comprising a feeder circuit, a first antenna element and a second antenna element. The first antenna element having a first end connected to the feeder circuit and a grounded second end includes a forward path and a backward path short-circuiting to each other at a shorting bridge, and is a half wavelength long of a first frequency in the band of use. The distance between the first end and the second end is no greater than one-tenth wavelength of the first frequency. The second antenna element begins with the first end, shares a part of the forward path with the first antenna element, diverges from the forward path at a diverging point before the shorting bridge, comes to an open end and is one-fourth wavelength long of a second frequency in the band of use.

REFERENCES:
patent: 4138681 (1979-02-01), Davidson et al.
patent: 5598169 (1997-01-01), Drabeck et al.
patent: 6734825 (2004-05-01), Guo et al.
patent: 6861986 (2005-03-01), Fang et al.
patent: 11-68453 (1999-03-01), None
patent: 2004-96314 (2004-03-01), None
Antenna Engineering Handbook, pp. 112-113, Figures 4.1 and 4.3, edited by The Institute of Electronics, Information and Communication Engineers, Ohm-sha, Oct. 1996.
Dual-Band Folded Antenna with Two Shorted Points, by K. Sato and T. Amano, IEICE General Conference B-1-57, The Institute of Electronics, Information and Communication Engineers, Mar. 2004.

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