Communications: radio wave antennas – Antennas – With radio cabinet
Reexamination Certificate
2000-04-28
2001-04-17
Wong, Don (Department: 2821)
Communications: radio wave antennas
Antennas
With radio cabinet
C343S895000
Reexamination Certificate
active
06218993
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is related to a gain structure of a stretchable antenna for mobile phones, and especially to a gain structure of a stretchable rod antenna capable of increasing capability of signal receiving and emitting in cooperation with a coil antenna when the rod antenna is stretched.
2. Description of the Prior Art
A conventional antenna for mobile phones is divided mainly into two kinds; they are the quarter-wave and the half-wave antennas. The quarter-wave antennas have lower impedance in servo linking, and do not need using of impedance transformers, but they are inferior to the half-wave antennas in the capability of signal receiving and emitting. The half-wave antennas have higher impedance, and need using of impedance transformers in the interior of their mobile phones.
In the recent years, mobile phones tend to be minimized. Half-wave antennas have higher impedance and need impedance transformers which occupy larger space in their mobile phones; other redundant parts used further increase their costs. Lengths of half-wave antennas generally are hard to suit modern pocket mobile phones; such lengths are disproportional to the main bodies after assembling. In view of this, pocket mobile phones generally use quarter-wave antennas or quarter-wave coil antenna; however, quarter- wave antennas are evidently insufficient in the capability of signal receiving and emitting even when the rods of antennas as radiators are fully stretched.
In a U.S. patent “Antenna device for portable equipment” U.S. Pat. No. 5,757,325 granted to Saldell, an impedance transformer is evidently used.
In another U.S. Pat. No. 5,661,495 granted to Saldell, a technique is disclosed to use a switching device to separate a quarter-wave antenna when the antenna is retracted; however, it is still insufficient in the capability of signal receiving and emitting.
In another U.S. Pat. No. 5,771,023, a coil antenna for broad bands is disclosed, wherein, a broadband antenna is formed by connecting two coil antennas respectively with a rod antenna.
A U.S. Pat. No. 5,650,789 provides a retractable antenna for an indoor wireless telephone set, of which two coil antennas are respectively used at the end of a rod antenna and the telephone set. The coil antenna at the end of the rod antenna is electrically broken when the latter is stretched out, but can make a fixed coil antenna on the surface of an engaging seat form electromagnetic coupling with the coil antenna at the end of the rod antenna for signal receiving and emitting when the rod antenna is retracted. This patent still cannot increase capability of signal receiving and emitting by using a quarter-wave antenna.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a gain structure of a stretchable antenna for mobile phones, wherein, a coil antenna is provided in a connecting member on the telephone set. The coil antenna is connected with a metallic conductive block normally. A spring sheet is connected on an end thereof with the metallic conductive block, while the other end thereof contacts the electric circuit board in the telephone set. A rod antenna which can be stretched and contracted and is provided with a metallic bottom end sleeve is not electrically connected when it is contracted, and has the metallic bottom end sleeve connected to the metallic conductive block to get gain in capability of signal receiving and emitting when it is stretched. The above stated structure of antenna can thus suit a quarter-wave coil antenna and a quarter-wave rod antenna on a miniature mobile phone.
The present invention will be apparent in its novelty and features after reading the detailed description of the preferred embodiment thereof in reference to the accompanying drawings.
REFERENCES:
patent: 5686927 (1997-11-01), Simmons
patent: 5717409 (1998-02-01), Garner et al.
patent: 5945953 (1999-08-01), Tsuda et al.
patent: 6075489 (2000-06-01), Sullivan
Chao Jack
Yang Annie
Auden Technology Mfg. Co. Ltd.
Dougherty & Troxell
Tran Chuc D
Wong Don
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