1. Field of the Invention
The present invention relates to an antenna apparatus for receiving digital signals, and especially relates to an antenna apparatus which can be adjusted to a proper direction to receive horizontal or vertical digital signals.
2. Description of Related Art
A general digital antenna has a base and a signal receiving board fixedly mounted on the base.
When the antenna is receiving signals, the nonadjustable signal receiving board can perform well in receiving vertical signals. However, the horizontal signals can not be received clearly due to the direction of the signal receiving board. For solving the problem, a user must adjust the antenna and even rest it at a horizontal position for receiving horizontal signals. Thus, it is clearly inconvenient to so adjust the antenna.
Therefore, the invention provides an antenna apparatus to mitigate or obviate the aforementioned problems.
The main objective of the present invention is to provide an antenna apparatus which can be adjusted to effectively receive both horizontal and vertical signals.
Other objectives, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
With reference to
The base (11) is formed with a plate (111) having a front side and a back side and an outer periphery (112) between the front side and back side. The outer periphery (112) has two notches (113) defined at two diametrically opposite sides thereof. Four holes (114) are evenly defined at the front side of the base (11). A sleeve (115) is mounted on the center of the base (11).
The first connecting rod (12) has a slot (121) defined at a first end thereof, and a first bush (122) provided at a second end thereof and rotatably received in the sleeve (115).
The second connecting rod (13) has a tongue (131) formed at a first end thereof and pivotally mounted in the slot (121) of the first connecting rod (12).
A signal receiving board (20) has a stub (21) formed at a lower side thereof. The stub (21) has an open end for receiving a second end of the second connecting rod (13). A second bush (23) is provided between the stub (21) and the second end of the second connecting rod (13). A channel (211) is longitudinally defined through an outer periphery of the stub (21) and a threaded hole (212) is radially defined through the outer periphery of the stub (21). The signal receiving board (20) is rotatably mounted on the second connecting rod (13) and can be fastened by a screw (24) threadingly inserted in the threaded hole (212) to press the second bush (23) towards the second connecting rod (13). In addition, the second bush (23) can be replaced by a ring.
With reference to
With reference to
With reference to
With reference to
With reference to
It is to be understood, however, that even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
Number | Name | Date | Kind |
---|---|---|---|
6215445 | Chang | Apr 2001 | B1 |
6999034 | Tsai et al. | Feb 2006 | B1 |
20040257299 | Tai et al. | Dec 2004 | A1 |
20050024276 | Izumi | Feb 2005 | A1 |
20050116877 | Wu | Jun 2005 | A1 |