Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Reexamination Certificate
2005-03-17
2009-10-06
Chen, Shih-Chao (Department: 2821)
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
C343S7000MS
Reexamination Certificate
active
07598921
ABSTRACT:
An antenna element1is formed such that a plurality of turning parts13, 15, 17are formed by being turned back in zigzag in parallel to a ground conductor film2while extending perpendicularly thereto and the lengths of segments12, 14, 16, 18between the turning parts are shorter on a side of the ground conductor film2(a side of a feeding part4) and increase gradually as the segments are away from the ground conductor film2. The turning parts of the antenna element1are formed such that the antenna resonates at two or more frequency bands, and has a fractional bandwidth of 4% or more of its frequency in a first frequency band and a fractional bandwidth of 15% or more of its frequency in a second frequency band by adjusting the lengths L1, L2and L3of respective segments and the intervals d1, d2and d3between adjacent segments. Consequently, a wideband antenna is realized in two or more multi-frequency bands, for example 2.4 to 2.5 GHz and 5 to 6 GHz, by using a single folded antenna.
REFERENCES:
patent: 3355740 (1967-11-01), Mayes
patent: 4286271 (1981-08-01), Barbano et al.
patent: 6674405 (2004-01-01), Wang
patent: 6693604 (2004-02-01), Washiro et al.
patent: 10-013135 (1998-01-01), None
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patent: 2003-069331 (2003-03-01), None
patent: 2003-124737 (2003-04-01), None
patent: 2003-218623 (2003-07-01), None
Ge JunXiang
Ichikawa Hiroshi
Kameda Shozaburo
Chen Shih-Chao
Rabin & Berdo P.C.
UBE Industries Ltd.
Yokowo Co., Ltd.
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