CN103219581A - broadband antenna - Google Patents

Abstract

The invention provides a broadband antenna, which is used for a wireless communication device and comprises: a grounding part; a radiator extending in a first direction for receiving and transmitting wireless signals; a signal feed-in end connected to the radiator for transmitting a feed-in signal to the radiator; and a first parasitic radiator extending towards the first direction, one side of the first parasitic radiator being spaced from one side of the radiator by a first distance, and the other side being spaced from the grounding part by a second distance. The first distance makes the first parasitic radiator and the radiator generate coupling action to form a slot antenna for receiving and transmitting wireless signals, and the second distance makes the first parasitic radiator and the grounding part generate coupling action to form a pair of grounding coupling paths to increase the frequency width.

Description

broadband antenna

technical field

The invention refers to a broadband antenna, especially a slot antenna formed by radiators at specific intervals, which increases the operating bandwidth and conforms to the structure of the product.

Background technique

Antennas are used to transmit or receive radio waves to transmit or exchange radio signals. General electronic products with wireless communication functions, such as notebook computers, personal digital assistants (Personal Digital Assistant), etc., usually access wireless networks through built-in antennas. With the evolution of wireless communication technology, the operating frequencies of different wireless communication systems may be different. Therefore, an ideal antenna should be able to cover frequency bands required by different wireless communication networks with a single antenna. In addition, in line with the trend of shrinking size of portable wireless communication devices, in addition to broadband requirements, the size of the antenna should be reduced as much as possible to integrate the antenna into the portable wireless communication device.

Most of today's portable wireless communication devices often use metal shells or frames in order to take into account the aesthetics and durability. Therefore, when the antenna is integrated into the portable wireless communication device, it often encounters the problem of reduced antenna efficiency or instability. In this case, in addition to facing the challenge of broadband requirements, antenna designers also need to consider the integration with the metal frame. For example, how to design an antenna supporting digital TV frequency bands (470MHz-862MHz) and long-term evolution (Long Term Evolution, LTE) frequency bands (698MHz-960MHz and 1710MHz-2700MHz) in a metal frame environment, there is a certain difficulty.

Therefore, how to combine the antenna with the metal frame environment to design a broadband antenna with broadband characteristics while meeting the space constraints of wireless communication devices has become one of the goals of the industry.

Contents of the invention

Therefore, the main purpose of the present invention is to provide a broadband antenna which has broadband characteristics and satisfies the space constraints of wireless communication devices.

The invention discloses a broadband antenna for a wireless communication device, including a grounding part; a radiator extending toward a first direction, and the radiator is used to send and receive wireless signals; a signal feed-in terminal electrically connected to the radiator a body for transmitting a feed-in signal to the radiator; and a first parasitic radiator extending toward the first direction, one side of the first parasitic radiator is separated from one side of the radiator by a first distance, and the other One side is separated from the ground portion by a second distance. Wherein, the first distance makes the first parasitic radiator and the radiator produce a coupling effect to form a slot antenna for transmitting and receiving wireless signals, and the second distance makes the first parasitic radiator and the ground part produce a coupling effect. Coupling to form a pair of ground coupling paths to increase bandwidth.

The invention combines the antenna with the environment of the metal outer frame and cooperates with the coupling function to design a wide-band antenna with wide-band characteristics, while satisfying the space limitation of the wireless communication device.

Description of drawings

FIG. 1A is a schematic diagram of a broadband antenna according to an embodiment of the present invention.

FIG. 1B is a schematic diagram of the VSWR of the broadband antenna shown in FIG. 1A .

FIG. 2 , FIG. 3 , FIG. 4 , FIG. 5 , FIG. 6 , and FIG. 7 to FIG. 8 are schematic diagrams of broadband antennas according to different embodiments of the present invention.

Figure number:

10, 20, 30, 40, 50, 60, 70, 80 broadband antenna

100 metal frame

102, 802 grounding part

104, 200 radiators

106 signal feed-in terminal

108, 300, 302, 400, 402 parasitic radiators

110, 500, 502, 710 connecting elements

112 matching components

114 system ground terminal

600 matching circuit

d1, d2, d3, d4 distance

Detailed ways

Please refer to FIG. 1A , which is a schematic diagram of a broadband antenna 10 according to an embodiment of the present invention. As shown in Figure 1A, the broadband antenna 10 is suitable for a wireless communication device, and can be integrated with a metal frame 100 of the wireless communication device. ) wireless signal. In detail, the broadband antenna 10 includes a ground portion 102 , a radiator 104 , a signal feed-in terminal 106 , a parasitic radiator 108 , a connecting element 110 and a matching element 112 . The ground portion 102 is connected to a system ground 114 for providing grounding. The radiator 104 is used for transmitting and receiving wireless signals. The signal feed-in terminal 106 is electrically connected to the radiator 104 and used for transmitting the feed-in signal to the radiator 104 . The parasitic radiator 108 extends in the same direction as the radiator 104 and is electrically connected to the connection element 110 for transmitting and receiving wireless signals. It is electrically connected with the matching element 112 . In addition, the parasitic radiator 108 and the radiator 104 are separated by a distance d1 to form a slot, so that the parasitic radiator 108 and the radiator 104 can generate a coupling effect to form a slot antenna. In addition, the parasitic radiator 108 is separated from the ground portion 102 by a distance d2, so that the two have a coupling effect and form a ground coupling path from the parasitic radiator 108 to the ground portion 102 . The metal frame 100 is separated from the radiator 104 , the connection element 110 and the matching element 112 by a distance d3 , so that the metal frame 100 , the radiator 104 , the connection element 110 and the matching element 112 are coupled. The radiator 104 is separated from the connection element 110 by a distance d4, so that the radiator 104 and the connection element 110 have a coupling effect. Therefore, through the coupling effect between elements, an additional current path can be generated, so that the bandwidth can be additionally increased, and the broadband effect can be achieved at the same time.

To put it simply, the radiator 104 and the parasitic radiator 108 of the broadband antenna 10 are used to send and receive relatively high-frequency wireless signals, and the distance d1 between the parasitic radiator 108 and the radiator 104 can produce the effect of a slot antenna. To send and receive relatively low frequency wireless signals. In addition, through the coupling effect of the parasitic radiator 108 and the ground part 102, the coupling effect of the metal frame 100 and the radiator 104, the connection element 110 and the matching element 112, and the coupling effect of the radiator 104 and the connection element 110, additional resonance can be achieved. The high-frequency and low-frequency frequency bands can be used to improve the broadband characteristics to be suitable for the required communication frequency bands (such as DTV, LTE, WWAN, WLAN and Wimax operating frequency bands).

Please continue to refer to FIG. 1B , which is a schematic diagram of the VSWR of the broadband antenna 10 . As can be seen from FIG. 1B , the broadband antenna 10 can indeed meet the broadband requirements by utilizing the coupling effect between components, and more importantly, it can meet the space limitation of the wireless communication device.

It should be noted that FIG. 1A is used to illustrate the concept of the present invention, and those skilled in the art may make various changes and modifications accordingly, and are not limited thereto. For example, the metal outer frame 100 is preferably a part of the housing of the wireless communication device, and is connected to the ground terminal of the wireless communication device, and is mainly used to form a pair of ground coupling paths to increase the bandwidth additionally. Its length is not limited. In addition, the size of the distance d1 should ensure that the parasitic radiator 108 and the radiator 104 can generate a coupling effect to form a slot antenna. Similarly, the size of the distances d2, d3, and d4 should also ensure that the related components can generate a coupling effect. Otherwise, there is no limit. For example, the distance d1 can be 1-2mm, and the distances d2, d3, d4 can be 3mm, but not limited thereto, and can be adjusted according to different embodiments.

In addition, the shape of the radiator 104 and the number and position of the parasitic radiator 108 are not limited. Therefore, those skilled in the art may make various changes and modifications accordingly to meet system requirements. For example, please refer to FIG. 2 , FIG. 3 to FIG. 4 . FIG. 2 , FIG. 3 to FIG. 4 are schematic diagrams of broadband antennas 20 , 30 , 40 according to embodiments of the present invention. The structure of the broadband antenna 20 , 30 , 40 is similar to that of the broadband antenna 10 , so the same components use the same symbols. The broadband antenna 20 differs from the broadband antenna 10 in that a radiator 200 of the broadband antenna 20 is elongated (other planes or geometric shapes are also applicable to the present invention). The broadband antenna 30 differs from the broadband antenna 10 in that the broadband antenna 30 replaces the parasitic radiator 108 with parasitic radiators 300 and 302 . The parasitic radiators 300 and 302 are both electrically connected to the connection element 110 and parallel to the radiator 104 . In detail, there is also a distance d1 between the parasitic radiator 300 and the radiator 104 to ensure the effect of a slot antenna. At the same time, the parasitic radiator 300 and the parasitic radiator 302 can produce a coupling effect, and the parasitic radiator 302 can also produce a coupling effect with the grounding part 102, thus forming a ground connection between the parasitic radiator 300, the parasitic radiator 302 and the grounding part 102. coupling path, which can increase bandwidth additionally. On the other hand, similar to the broadband antenna 30, two parasitic radiators are used to replace the parasitic radiator 108 of the broadband antenna 10. As shown in FIG. Between the outer frame 100 and the grounding portion 102 , both are also electrically connected to the connecting element 110 , thereby still belonging to the structure of the present invention, and also suitable for combining with the metal outer frame of the wireless communication device to produce broadband effect.

In addition, as is well known to those skilled in the art, the operating frequency of the antenna is related to the current path. Therefore, the designer should properly adjust the size and material of the broadband antenna 10 according to the required operating frequency band, or add matching components to meet different system requirements. For example, please refer to FIG. 5 and FIG. 6 . FIG. 5 and FIG. 6 are schematic diagrams of broadband antennas 50 and 60 according to embodiments of the present invention. The structure of the broadband antenna 50, 60 is similar to that of the broadband antenna 10, so the same symbols are used for the same elements. The difference between the broadband antenna 50 and the broadband antenna 10 is that a connection element 500 of the broadband antenna 50 does not extend out of the matching element (such as the matching element 112 of the broadband antenna 10), and an additional connection element 502 is added, which is electrically connected to the grounding part 102 and Between the metal frame 100, it can be coupled with the connection element 500 to increase the bandwidth additionally. The broadband antenna 60 differs from the broadband antenna 10 in that a matching circuit 600 is added to the broadband antenna 60, which can be composed of elements such as resistors, inductors, and capacitors, and is electrically connected between the radiator 104 and the parasitic radiator 108 for use in Matching is achieved, thereby still belonging to the structure of the present invention, which is also suitable for combining with the metal frame of the wireless communication device and producing broadband effect.

On the other hand, in the foregoing embodiments, the connection element 110 is electrically connected to the ground portion 102 , and the ground portion 102 is electrically connected to the metal frame 100 . Actually, the connection element 110 can be separated from the ground part 102 or the ground part 102 can be separated from the metal frame 100 . For example, please refer to FIG. 7 and FIG. 8 . FIG. 7 and FIG. 8 are schematic diagrams of broadband antennas 70 and 80 according to embodiments of the present invention. The structure of the broadband antenna 70, 80 is similar to that of the broadband antenna 10, so the same symbols are used for the same elements. The broadband antenna 70 is different from the broadband antenna 10 in that a connection element 710 of the broadband antenna 70 is not electrically connected to the ground portion 102, and the broadband antenna 80 is different from the broadband antenna 10 in that a ground portion 802 of the broadband antenna 80 is not electrically connected. The metal frame 100 , which still belongs to the structure of the present invention, is also suitable for combining with the metal frame of the wireless communication device to produce broadband effect.

All in all, by using specific spacing radiators and parasitic radiators to form a slot antenna, the operating bandwidth is increased. At the same time, the antenna is combined with the metal frame of the wireless communication device, and the coupling effect is used to increase the resonance frequency band, thereby improving the antenna. Bandwidth, that is, the present invention can improve the problem of low antenna efficiency or instability when the antenna is integrated into a portable wireless communication device, thereby making the antenna suitable for various communication frequency bands.

It should be noted that the above-mentioned various changes of the broadband antenna 10 are intended to illustrate the concept of the present invention, and other changes such as material, manufacturing method, shape and position of each component can be appropriately changed in response to different needs, and are not limited thereto. . And through the slot antenna formed by radiators and parasitic radiators at specific intervals, and integrating the antenna into the metal frame of the wireless communication device, with the coupling effect, the present invention can simultaneously improve the prior art caused by the metal frame environment The problem of antenna efficiency reduction or instability, so as to achieve broadband effect and conform to product organization.

To sum up, the present invention combines the antenna with the metal frame environment and cooperates with the coupling function to design a broadband antenna with broadband characteristics, while meeting the space constraints of the wireless communication device.

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the claims of the present invention shall fall within the scope of the present invention.

Claims (11)

1. a wide frequency antenna is characterized in that, is used for a wireless communication apparatus, and described wide frequency antenna comprises:

One grounding parts;

One radiant body extends towards a first direction, and described radiant body is used for the transmitting/receiving wireless signal;

One signal feed side is electrically connected on described radiant body, is used for transmitting a FD feed to described radiant body; And

One first parasitic radiation body extends towards described first direction, one side of the described first parasitic radiation body and interval, one side of described radiant body one first distance, and another side and described grounding parts be a second distance at interval;

Wherein, described first distance makes described first parasitic radiation body and described radiant body produce coupling, to form a slot antenna, be used for the transmitting/receiving wireless signal, described second distance makes described first parasitic radiation body and described grounding parts produce coupling, to form a coupling path over the ground, to increase frequency range.

2. wide frequency antenna as claimed in claim 1, it is characterized in that, described wide frequency antenna comprises a Connection Element in addition, be electrically connected on the described first parasitic radiation body, and extend towards a second direction, and with another side interval one specific range of described radiant body, described specific range makes described Connection Element and described radiant body produce coupling.

3. wide frequency antenna as claimed in claim 2 is characterized in that described Connection Element is electrically connected on described grounding parts in addition.

4. wide frequency antenna as claimed in claim 2 is characterized in that, described second direction and described first direction approximate vertical.

5. wide frequency antenna as claimed in claim 1 is characterized in that, described wide frequency antenna comprises one second parasitic radiation body in addition, is parallel to the described first parasitic radiation body.

6. wide frequency antenna as claimed in claim 1 is characterized in that described wide frequency antenna comprises a matching element in addition, is electrically connected on described Connection Element.

7. wide frequency antenna as claimed in claim 1 is characterized in that described wide frequency antenna comprises a match circuit in addition, is electrically connected between described radiant body and the described first parasitic radiation body.

8. wide frequency antenna as claimed in claim 1, it is characterized in that, described wide frequency antenna comprises a metal outer frame in addition, with described radiant body with respect to the opposite side of the described first parasitic radiation body at a distance of a specific range, described specific range makes described metal outer frame and described radiant body produce coupling, to increase frequency range.

9. wide frequency antenna as claimed in claim 8 is characterized in that, described metal outer frame is the part of a housing of described wireless communication apparatus.

10. wide frequency antenna as claimed in claim 8 is characterized in that described metal outer frame is electrically connected on described grounding parts in addition.

11. wide frequency antenna as claimed in claim 8 is characterized in that, described wide frequency antenna comprises a Connection Element in addition, is electrically connected between described grounding parts and the described metal outer frame.

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