This application claims priority to Chinese Application No 201110069642.3, filed on Mar. 18, 2011.
1. Field of the Invention
The invention relates to a concealed antenna, more particularly to a small shorted patch antenna.
2. Description of the Related Art
U.S. Pat. No. 6,600,448B2 discloses a patch antenna fed by a small coaxial line where the patch antenna and a system ground plane can be individually installed inside an electronic device, giving flexibility in the position to which the patch antenna can be installed. However, this type of patch antenna can only be disposed on one side of a metallic object. If the patch antenna is disposed directly on top of the metallic object, impedance matching and radiation efficiency of the patch antenna would be affected.
Therefore, an object of the present invention is to provide a small shorted patch antenna that is flexible in terms of installation position and that is suitable for installation inside electronic products.
According to a first aspect of the present invention, a shorted patch antenna comprises a metal plate having two parallel long sides and two short sides connecting to the two parallel long sides. The metal plate further has a first fold line and a second fold line that are parallel to the two short sides of the metal plate and that partition the metal plate into a ground portion on one side of the first fold line and a radiating portion on one side of the second fold line. The ground portion has a length longer than a length of the radiating portion and not longer than twice the length of the radiating portion.
The metal plate further has a shorting port ion between the first fold line and the second fold line and connecting the ground portion and the radiating portion, and a feed-in portion extending from the second fold line toward the first fold line. The feed-in portion forms a first slit with the ground portion, and forms a second slit with the shorting portion. The first slit is connected to the second slit.
The shorting portion is folded relative to the ground portion along the first fold line such that the shorting portion and the feed-in portion are substantially perpendicular with respect to the ground portion.
The radiating portion is folded relative to the shorting portion and the feed-in portion along the second fold line such that the radiating portion is substantially perpendicular with respect to the shorting portion and the feed-in portion and such that the radiating portion is spaced apart from a surface of the ground portion.
The two short sides are located on a same side of the first fold line.
According to a second aspect of the present invention, a shorted patch antenna comprises a ground portion, a radiating portion, a shorting portion and a feed-in portion.
The ground portion has a first long edge and a second long edge opposite to each other, and a first short edge and a second short edge opposite to each other and each connected to the first long edge and the second long edge.
The radiating portion is spaced apart from a surface of the ground portion and has a third long edge and a fourth long edge opposite to each other, and a third short edge and a fourth short edge opposite to each other and each connected to the third long edge and the fourth long edge.
The third short edge is aligned with the first short edge.
The second short edge and the fourth short edge are located on a same side of the first short edge.
The shorting portion has a first side connected to the first short edge of the ground portion, and a second side opposite to the first side and connected to the third short edge of the radiating portion.
The feed-in portion is connected to the third short edge of the radiating portion, extends from the third short edge towards the first short edge, forms a first slit with the first short edge, and forms a second slit with the shorting portion.
The first slit and the second slit are interconnected.
According to a third aspect of the present invention, a patch antenna comprises a ground portion, a radiating portion, a shorting portion and a feed-in portion.
The ground portion has a first long edge and a second long edge opposite to each other, and a first short edge and a second short edge opposite to each other and each connected to the first long edge and the second long edge.
The radiating portion is spaced apart from a surface of the ground portion and has a third long edge and a fourth long edge opposite to each other, and a third short edge and a fourth short edge opposite to each other and each connected to the third long edge and the fourth long edge.
The third long edge is aligned with the first long edge. The second short edge and the fourth short edge are located on a same side of the first short edge.
The shorting portion has a first side connected to the first long edge of the ground portion, and a second side opposite to the first side and connected to the third long edge of the radiating portion. The feed-in portion is connected to the third long edge of the ground portion, extends from the third long edge towards the first long edge, forms a first slit with the first long edge, and forms a second slit with the shorting portion. The first slit and the second slit are interconnected.
The length of the ground portion is longer than the length of the radiating portion and shorter than twice the length of the radiating portion. Preferably, the length of the ground portion is 1.6 times the length of the ground portion.
Preferably, each of the first slit and second slit has a slit width of 1 mm.
The effect of the present invention is by stamping a single metal plate to form the first slit and the second slit between the ground portion and the radiating portion and by folding of the shorting portion and the radiating portion along the first fold line and the second fold line respectively, a small shorted patch antenna is formed. Not only is the structure of the antenna easy and inexpensive to make, the shorting portion and the feed-in portion are both on the same side of the antenna, allowing flexibility in the installation of the antenna inside an electronic device.
Other features and advantages of the present invention will become apparent in the following detailed description of the preferred embodiments with reference to the accompanying drawings, of which:
a is a chart showing the radiation pattern on the x-z plane of the first embodiment operating at 2442 MHz;
b is a chart showing the radiation pattern on the x-y plane of the first embodiment operating at 2442 MHz;
c is a chart showing the radiation pattern on the y-z plane of the first embodiment operating at 2442 MHz;
a shows the radiation pattern of the first embodiment operating at 2400 MHz;
b shows the radiation pattern of the first embodiment operating at 2484 MHz;
c shows the radiation pattern of the first embodiment operating at 2442 MHz;
Referring to
The metal plate 3 has a first fold line 35 and a second fold line 36 that are parallel to the two short edges 33, 34. The two fold lines 35, 36 partition the metal plate 3 into a ground portion 37 on one side of the first fold line 35 and a radiating portion 38 on one side of the second fold line 36. The ground portion 37 has a length longer than a length of the radiating portion 38 and not longer than twice the length of the radiating portion 38. The ground portion 37 has a first long edge 371 and a second long edge 372 that are arranged parallel to each other and equal in length, and a first short edge 373 and a second short edge 374 that are each connected to the first long edge 371 and the second long edge 372. The radiating portion 38 has a third long edge 381 and a fourth long edge 382 that are arranged parallel to each other and equal in length and a third short edge 383 and a fourth short edge 384 that are each connected to the third long edge 381 and the fourth long edge 382.
Further, between the first fold line 35 (or the first short edge 373) and the second fold line 36 (or the third short edge 383) , there is a shorting portion 39 on the side of a long side 31 and connecting to the ground portion 37 and the radiating portion 38, and a feed-in portion 41 extending from the second fold line 36 (or the third short edge 383) toward the first fold line 35 (or the first short edge 373). That is, the short circuit section 39 and the feed-in portion 41 are located between the first fold line 35 (or the first short edge 373) and the second fold line 36 (or the third short edge 383). Between the feed-in portion 41 and the first short edge 373 of the ground portion 37, there is a first slit 42 extending along the first fold line 35. Between the feed-in portion 41 and the shorting portion 39, there is a second slit 43 that is interconnected with the first slit 42 and that is arranged substantially perpendicular to the first slit 42. The feed in portion 41 near the first short edge 373 of the ground portion 37 makes it convenient to connect a signal line of a small type coaxial cable (not shown) to a feed-in point A on the feed-in portion 41, and to connect a ground line of the small type coaxial cable to a ground point B on the first short edge 373 of the ground portion 37 for feeding a signal.
The dimensions of the metal plate 3, the ground portion 37, the radiating portion 38, the shorting portion 39 and the feed-in portion 41 of the present embodiment are shown in
Referring to
By adjusting the widths of the first slit 42 and the second slit 43 (for example, in
Referring to
It is apparent from the foregoing that the small shorted patch antenna of the present embodiment has the ground portion 37 and the radiating portion 38 of the same width, and the length of the ground portion 37 is 1.6 times the length of the radiating portion 38, such that the dimensions of the ground portion 37 are close to those of the radiating portion 38. Comparing the ground portion 37 to the ground plane with the conventional patch antenna and the conventional inverted-F patch antenna, the ground portion 37 of the present embodiment is much smaller. Therefore, not only can the small shorted patch antenna of the present embodiment be disposed independently inside an electronic device, it also gives a lot of flexibility and freedom in terms of installation. Moreover, the distal ends of the ground portion 37 and the radiating portion 38 (the second short edge 374 and the fourth short edge 384) both extend in the same direction, while the shorting portion 39 and the feed-in portion 41 are both located on the short edges 373, 383 of the ground portion 37 and the radiating portion 38 that are on the same side. This allows signal feed in when using small type coaxial lines (not shown) to be a lot more convenient, giving even more flexibility in terms of installation inside an electronic device.
Referring to
As described above, the embodiments use one single metal plate that is stamped to form a first slit 42 (42′) and the second slit 43(43′) between the ground portion 37(37′) and the radiating portion 38(38′), and the shorting portion 39 (39′) and the radiating portion 38 (38′) are folded along the first fold line 35(35′) and the second fold line 36(36′) to form a small shorted patch antenna. Not only is the antenna simple in structure, the manufacturing process is also simple and the manufacturing cost is low. Also, the shorting portion 39(39′) and the feed-in portion 41 (41′) are both located on the same side on the antenna, allowing the antenna to be installed easily and flexibly inside an electronic device. Moreover, by having the ground portion 37(37′) serve as a shield, whether or not the antenna is set up on the side or on top of a metal component, it would not affect the impedance matching and the radiation efficiency.
While the present invention has been described in connection with what are considered the most practical and preferred embodiments, it is understood that this invention is not limited to the disclosed embodiments but is intended to cover various arrangements included within the spirit and scope of the broadest interpretation so as to encompass all such modifications and equivalent arrangements.
Number | Date | Country | Kind |
---|---|---|---|
201110069642.3 | Mar 2011 | CN | national |