CN101582538B - Array antenna - Google Patents

Abstract

An array antenna includes a first antenna unit, a second antenna unit, a third antenna unit and a fourth antenna unit. The second antenna element is adjacent to the first antenna element. The third antenna element is adjacent to the second antenna element. The fourth antenna element is adjacent to the third antenna element and the first antenna element and opposite to the second antenna element.

Description

array antenna

technical field

The present invention relates to an array antenna, in particular to an omnidirectional array antenna.

Background technique

Known antennas generally use omnidirectional dipole antennas in order to cover all surrounding areas. However, the gain of dipole antennas is not high and the transmission distance is limited. To improve the gain of a dipole antenna, its size needs to be increased. Taking a dipole antenna with a gain of 11dBi in the 0.8GHz frequency band as an example, its size must be at least 300 cm.

The known technologies also include microstrip antennas disclosed in US Patent Publication No. 20060273865 and US Patent Publication No. 7,173,572. The combination requires a jig or a support frame to complete, and the cost is relatively high, and the volume is still relatively large.

Contents of the invention

The present invention provides an array antenna for solving the problems of the known technology, including a first antenna unit, a second antenna unit, a third antenna unit and a fourth antenna unit. The second antenna element is adjacent to the first antenna element. The third antenna element is adjacent to the second antenna element and opposite to the first antenna element. The fourth antenna unit is adjacent to the third antenna unit and the first antenna unit, and opposite to the second antenna unit.

By applying the array antenna of the present invention, a small-sized antenna structure can be used to provide omnidirectional and good signal transmission effects.

Description of drawings

Fig. 1 shows the array antenna of the present invention;

Fig. 2 shows the structure of the first antenna unit alone;

Figure 3a shows the structure of the first antenna on the first upper surface;

Figure 3b shows the structure of the first antenna on the first lower surface;

4 is a vertical plane (E-Plane) field diagram showing an array antenna according to an embodiment of the present invention;

5 is a horizontal plane (H-Plane) field diagram showing an array antenna according to an embodiment of the present invention;

FIG. 6 shows the input return loss of the array antenna according to the embodiment of the present invention.

Detailed ways

Referring to FIG. 1 , it shows an array antenna 100 according to an embodiment of the present invention, including a first antenna unit 101 , a second antenna unit 102 , a third antenna unit 103 and a fourth antenna unit 104 . The first antenna unit 101 , the second antenna unit 102 , the third antenna unit 103 and the fourth antenna unit 104 are all antenna structures with an L-shaped cross section. The second antenna unit 102 is adjacent to the first antenna unit 101 . The third antenna unit 103 is adjacent to the second antenna unit 102 and opposite to the first antenna unit 101 . The fourth antenna unit 104 is adjacent to the third antenna unit 103 and the first antenna unit 101 .

The following takes the first antenna unit 101 as an example to describe the detailed structure of each antenna unit, wherein the first antenna unit 101, the second antenna unit 102, the third antenna unit 103 and the fourth antenna unit 104 have the same structure , so it will not be described separately.

Referring to FIG. 2 , it shows the structure of the first antenna unit 101 alone, which includes an L-shaped substrate 110 , a first antenna 120 and a second antenna 130 . The L-shaped substrate 110 includes a first area 111 and a second area 112, the first area 111 is perpendicular to the second area 112, the first area 111 includes a first upper surface 113 and a first lower surface 114, the The second region 112 includes a second upper surface 115 and a second lower surface 116 . The first antenna 120 is located in the first area 111 , and the second antenna 130 is located in the second area 112 .

3a and 3b, the detailed structure of the first antenna 120 will be described below. The first antenna 120 includes a first grounding portion 121 , two first radiating portions 122 , a first feeding conductor 124 , a first signal line (not shown), and a first grounding line (not shown). The first grounding portion 121 is connected to the above-mentioned first radiation portions 122, the first grounding portion 121 and the first radiation portion 122 are disposed on the first upper surface 113, and the first feed-in conductor 124 is disposed on the first lower surface. On the surface 114, the first feeding conductor 124 corresponds to the first radiation portion 122, the first ground line (not shown) is electrically connected to the first ground portion 121, and the first signal line (not shown) Electrically connected to the first feeding conductor 124 .

3b, the first feed conductor 124 includes a feed point 125, the feed point 125 is located between the above-mentioned first radiation parts 122, the first signal line (not shown) is electrically connected to the feed point 125 The first feed conductor 124 . At the same time, the first ground wire (not shown in the figure) is also on the first ground portion 121 at a position corresponding to the feeding point 125 , electrically connected to the first ground portion 121 . In an embodiment, the first ground wire and the first signal wire can be integrated into a coaxial cable.

3a, each first radiating portion 122 includes a first L-shaped radiating element 1221 and a second L-shaped radiating element 1222, the first L-shaped radiating element 1221 includes a first free end 1223, the second L The shaped radiating element 1222 includes a second free end 1224, and the first free end 1223 and the second free end 1224 respectively extend in opposite directions. The first L-shaped radiating element 1221 may further include a matching element 1225 , and the second L-shaped radiating element 1222 may further include a matching element 1226 , so as to obtain a better transmission effect.

There is a slit 123 between the first L-shaped radiating element 1221 and the second L-shaped radiating element 1222 . Referring to FIG. 3 b , the first feeding conductor 124 corresponds to the first L-shaped radiating element 1221 , the second L-shaped radiating element 1222 and the slit 123 . Thus, the first feeding conductor 124 is inductively coupled to the first radiation portion 122 .

In the above-mentioned embodiment, the case of two first radiating parts is taken as an example for illustration, but it does not limit the present invention. The array antenna applying the embodiment of the present invention can also use a single first radiating part, or three or more The first antenna of the first radiating part performs signal transmission.

With the structure of the first antenna unit, the second antenna includes a second grounding part, two second radiation parts, a second feeding conductor, a second signal line and a second grounding line, and the second grounding part is connected to the above-mentioned The second radiating parts, the second grounding part and the above-mentioned second radiating parts are arranged on the second upper surface, the second feeding conductor is arranged on the second lower surface, and the second feeding conductor Corresponding to the second radiating part, the second ground wire is electrically connected to the second ground part, and the second signal line is electrically connected to the second feeding conductor. Since the structure of the second antenna is exactly the same as that of the first antenna unit, it will not be described in additional illustrations.

In an embodiment of the present invention, the first ground portion and the second ground portion are connected to each other by welding. However, it does not limit the present invention, and the first ground portion and the second ground portion may also be integrally connected, or the first ground portion and the second ground portion may not be connected to each other.

The antenna unit of the embodiment of the present invention uses an endfire dipole antenna for signal transmission. Applying the array antenna 100 of the present invention, since the first antenna unit 101, a second antenna unit 102, a third antenna unit 103 and a fourth antenna unit 104 transmit signals in four directions respectively, it can cover the surrounding signals .

With reference to Fig. 4,5,6, Fig. 4 is the vertical plane (E-Plane) pattern diagram showing the array antenna of the embodiment of the present invention, and Fig. 5 is the horizontal plane (H-Plane) showing the array antenna of the embodiment of the present invention The field diagram, FIG. 6 shows the input return loss ( S11 ) of the array antenna according to the embodiment of the present invention. It can be seen from FIGS. 4 , 5 , and 6 that the array antenna of the embodiment of the present invention can provide omnidirectional and good signal transmission effects with a small-sized antenna structure.

Although the present invention has been disclosed above with specific preferred embodiments, it is not intended to limit the present invention. Anyone skilled in this art can still make some changes and modifications without departing from the spirit and scope of the present invention. , so the scope of protection of the present invention should be defined by the claims.

Claims (5)

1. An array antenna, characterized in that comprising: a first antenna unit comprising: The L-shaped substrate includes a first area and a second area, the first area is perpendicular to the second area, the first area includes a first upper surface and a first lower surface, and the second area includes a second upper surface and a first lower surface. two lower surfaces; The first antenna includes a first grounding part, a first radiation part and a first feeding conductor, the first grounding part is connected to the first radiation part, and the first grounding part and the first radiation part are arranged on the first upper On the surface, the first feeding conductor is arranged on the first lower surface, and the first feeding conductor corresponds to the first radiation part; and The second antenna includes a second grounding part, a second radiating part and a second feeding conductor, the second grounding part is connected to the second radiating part, and the second grounding part and the second radiating part are arranged on the second upper On the surface, the second feeding conductor is arranged on the second lower surface, and the second feeding conductor corresponds to the second radiating part; a second antenna element, said second antenna element being adjacent to said first antenna element; a third antenna element, said third antenna element being adjacent to said second antenna element; a fourth antenna unit, the fourth antenna unit is adjacent to the third antenna unit and the first antenna unit, and opposite to the second antenna unit; Wherein, the above-mentioned first antenna unit, the above-mentioned second antenna unit, the above-mentioned third antenna unit and the above-mentioned fourth antenna unit have the same structure. 2. The array antenna according to claim 1, wherein the first radiating part comprises a first L-shaped radiating element and a second L-shaped radiating element, the first L-shaped radiating element comprises a first free end, and the above-mentioned The second L-shaped radiating element includes a second free end, and the first free end and the second free end respectively extend in opposite directions. 3. The array antenna according to claim 2, characterized in that there is a slit between the first L-shaped radiating element and the second L-shaped radiating element, and the first feeding conductor corresponds to the first L-shaped a radiation element, the above-mentioned second L-shaped radiation element, and the above-mentioned slit. 4. The array antenna according to claim 1, wherein the first feeding conductor is inductively coupled to the first radiating part. 5. The array antenna according to claim 1, wherein the first ground portion and the second ground portion are connected to each other.

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