Communications: radio wave antennas – Antennas – With support for antenna – reflector or director
Reexamination Certificate
1999-10-15
2001-03-13
Phan, Tho (Department: 2821)
Communications: radio wave antennas
Antennas
With support for antenna, reflector or director
C343S765000, C343S878000, C343S892000, C074S005700, C244S003160, C318S035000
Reexamination Certificate
active
06201512
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention generally relates to a biaxially rotational structure, and more particularly to a biaxially rotational structure for a planar antenna in which the angle of the planar antenna can be adjusted biaxially.
2. Description of the Related Art
Conventional antenna for one-dimension polarized wireless communication is configured as a retractable elongated rod. For receiving the one-dimension polarized wireless communication signals, the conventional retractable elongated antenna can be adjusted its orientation at its joint according to the polarized direction of the one-dimension polarized wireless communication signals. However, due to the obstruction of any barriers and the interference of any other signals or electromagnetic fields, the one-dimension polarized wireless communication signal will significantly decay in the transmission path. Even though the antenna is adjusted to its optimal position, the one-dimension polarized wireless communication signal received by the antenna is still not clear enough as required.
In order to overcome the disadvantages of the one-dimension polarized wireless communication, a planar antenna for two-dimension polarized wireless communication is developed. With the radio frequency (RF) signal, the distances that the planar antenna can cover are much greater. For use in the two-dimension polarized wireless communication, the planar antenna has two freedoms of rotation such that the inclined angle and the directional angle of the planar antenna can be adjusted to conform to the polarized angle of the two-dimension polarized wireless communication signal. Accordingly, the planar antenna can receive better wireless communication signal.
FIG. 1
depicts a conventional planar antenna which mainly comprises an antenna
1
, a box set
2
, a hollow tube body
31
, ear members
32
, a plate
41
, two supports
42
, screws
43
and a cable. The supports
42
of the plate
41
press against the ear members
32
of the hollow tube body
31
such that the frictional force between the supports
42
and the ear members
32
enables the hollow tube body
31
to rotate horizontally with respect to the box set
2
. The antenna
1
also can rotate with respect to vertical direction of the box set
2
. According to the conventional planar antenna, the user might rotate the planar antenna along the vertical direction without any limitation and the cable therein might be tangled or even be broken. Besides, the conventional planar antenna utilizes friction force to sustain the twist force of the cable and the gravity force of the planar antenna. When the conventional planar antenna has been used for a long while, the frictional parts of the conventional planar antenna will wear out and thus will not function well any longer.
SUMMARY OF THE INVENTION
It is a primary object of the present invention to provide a. biaxially rotational structure for a planar antenna, wherein the biaxially rotational structure is provided with a rotation limiting mechanism for preventing the user from unlimitedly rotating the planar antenna along the directional angle (vertical direction), thereby the cable therein might not be tangled and broken.
It is another object of the present invention to provide a. biaxially rotational structure for a planar antenna, wherein the biaxially rotational structure is provided with resilient friction members at each axial direction to enhance the frictional torsion between each axially rotation members.
It is a further object of the present invention to provide a. biaxially rotational structure for a planar antenna, wherein the biaxially rotational structure is made of metal material so as to enhance the mechanical strength and elongate the use life.
According to one aspect of the present invention, the biaxially rotational structure mainly includes a biaxial base, a vertical shaft assembly disposed at the vertical direction of the biaxial base, a support frame pivotally mounted on the vertical shaft assembly for supporting an antenna, and a horizontal shaft assembly disposed at the horizontal direction of the biaxial base, wherein the biaxial base can rotate with respect to the horizontal shaft assembly and the support frame can rotate along the vertical shaft assembly with respect to the biaxial base. A mounting member presses a resilient washer against the support frame such that a pressing force from the resilient washer is always exerted on the support frame and depresses the support frame against the vertical shaft assembly. Accordingly, when the biaxially rotational structure of the present invention has been used for a long while, the friction torsion between the support frame and the vertical shaft assembly will be maintained. The horizontal shaft assembly has a shaft body and two resilient plates. When the shaft body and the resilient plates are inserted into the horizontal axial hole, the two resilient plates respectively depress against the shaft body. Thus, when the biaxially rotational structure of the present invention has been used for a long while, the friction forces among the shaft body, resilient plates and the horizontal axial hole will be maintained. According to the present invention, the biaxially rotational structure is provided with resilient friction members at each axial direction to enhance the frictional torsion between each axially rotation members so as to overcome the shortcomings of the conventional art.
According to another aspect of the present invention, the vertical shaft assembly is provided with a rotation limiting member at the second flange and the support frame is provided with a stopper near the mounting hole extending downwardly to the circumference of the second flange. When the support frame is rotated with respect to the vertical shaft assembly, the stopper of the support frame will be limited by the rotation limiting member of the vertical shaft assembly such that the support frame only can be rotated within one turn with respect to the vertical shaft assembly. Therefore, the biaxially rotational structure of the present invention will prevent the user from unlimitedly rotating the planar antenna along the directional angle (vertical direction), thereby the cable therein might not be tangled and broken.
Other objects, advantages, and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 4558325 (1985-12-01), Strom
patent: 4580461 (1986-04-01), Sears et al.
patent: 4786913 (1988-11-01), Barendregt et al.
patent: 4792812 (1988-12-01), Rinehart
patent: 5153485 (1992-10-01), Yamada et al.
Armstrong Westerman Hattori McCleland & Naughton, LLP
Phan Tho
RF-Link Systems Inc.
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