CN102315514B

CN102315514B - Miniature antenna

Info

Publication number: CN102315514B
Application number: CN201010221765.XA
Authority: CN
Inventors: 周震宇
Original assignee: Wistron Corp
Current assignee: Wistron Corp
Priority date: 2010-07-09
Filing date: 2010-07-09
Publication date: 2015-08-19
Anticipated expiration: 2030-07-09
Also published as: CN102315514A

Abstract

The present invention discloses a kind of miniature antenna, and it is used for transmitting-receiving one radiofrequency signal, and includes a metal wire, extends to a second place by a primary importance; One insulating barrier, extends to one the 3rd position by this primary importance, is used for the part of coated this primary importance of this metal wire to the 3rd position; One metal net, extends to one the 4th position by this primary importance, is used for this primary importance of this insulating barrier coated to the part of the 4th position; And a grounded metal pipe, extend to the 3rd position by one the 5th position, be used for the part of the 5th position to the 4th position of this metal net coated and the part of the 4th position of this insulating barrier coated to the 3rd position.

Description

Miniature antenna

Technical field

The present invention relates to a kind of miniature antenna, especially relate to a kind of small size, there is excellent radiation efficiency and field pattern, and the miniature antenna of wireless telecommunication system demand can be met.

Background technology

Antenna is used for launching or receiving radio wave, to transmit or to exchange radio signal.The electronic product of general tool wireless communication function, as the Portable wireless communication equipment such as notebook computer, Smartphone, carrys out access wireless network by built-in antenna usually.Therefore, in order to allow user can access wireless communication network more easily, the frequency range of ideal antenna should increase as much as possible in tolerance band, and size then should reduce as far as possible, to be entered in Portable wireless communication equipment by aerial integration.

Summary of the invention

Therefore, namely main purpose of the present invention is to provide a kind of miniature antenna, to solve the problem.

The object of the present invention is achieved like this, namely discloses a kind of miniature antenna, is used for transmitting-receiving one radiofrequency signal, includes a metal wire, extend to a second place by a primary importance; One insulating barrier, extends to one the 3rd position by this primary importance, and be used for this primary importance of this metal wire coated to the part of the 3rd position, this primary importance is less than the length of this primary importance to this second place to the length of the 3rd position; One metal knitted stratum reticulare, extends to one the 4th position by this primary importance, and be used for this primary importance of this insulating barrier coated to the part of the 4th position, this primary importance is less than the length of this primary importance to the 3rd position to the length of the 4th position; And a grounded metal pipe, the 3rd position is extended to by one the 5th position, be used for the part of the 5th position to the 4th position of this metal net coated, and the part of the 4th position of this insulating barrier coated to the 3rd position, the 5th position is between this primary importance and the 4th position.

Accompanying drawing explanation

Figure 1A is the schematic appearance of the embodiment of the present invention one miniature antenna;

Figure 1B is the generalized section of the miniature antenna of Figure 1A;

Fig. 2 is the voltage standing wave ratio schematic diagram of the miniature antenna of Figure 1A;

Fig. 3 is the statistics chart of the antenna efficiency of miniature antenna in different frequency of Figure 1A, gain and average gain;

Fig. 4 to Fig. 6 is respectively the radiation pattern figure of miniature antenna in 2.5GHz, 2.45GHz and 2.4GHz of Figure 1A;

Fig. 7 A to Fig. 7 E is the schematic diagram of a Making programme of the miniature antenna of Figure 1A;

Fig. 8 A to Fig. 8 E is the schematic diagram of another Making programme of the miniature antenna of Figure 1A.

Main element symbol description

10 antennas

100 metal wires

102 insulating barriers

104 metal nets

106 grounded metal pipes

108 protective layers

110 signal terminals

P1, P2, P3, P4, P5 position

Embodiment

Please refer to Figure 1A and Figure 1B, Figure 1A is the schematic appearance of the embodiment of the present invention one miniature antenna 10, and Figure 1B is the generalized section of miniature antenna 10.Miniature antenna 10 can be applicable to wireless communication apparatus; being used for receiving and dispatching wavelength is the radiofrequency signal of λ, and it formed primarily of metal wire 100, insulating barrier 102, metal net 104, grounded metal pipe 106, protective layer 108 and a signal terminal 110.For clearly demonstrating the framework of miniature antenna 10, in Figure 1A and Figure 1B, denote five positions P1, P2, P3, P4, P5.Specifically, metal wire 100 extends to position P2 by position P1, and wherein the partial visual of the position P1 to position P3 of metal wire 100 is holding wire, and the part of position P3 to position P2 is then radiant body.Insulating barrier 102 extends to position P3 by position P1, is used for the part of position P1 to position P3 in clad metal line 100, its material can be iron not dragon wait made by isolation material, but not as limit.Metal net 104 extends to position P4 by position P1, is used for the part of position P1 to position P4 in coated insulation layer 102, to provide metallic shield effect.Grounded metal pipe 106 extends to position P3 by position P5, its material can be the metal materials such as copper, be used for ground connection, wherein the part of the position P5 to position P4 of grounded metal pipe 106 is coated and be electrically connected on metal net 104, the part then coated insulation layer 102 of position P4 to position P3.Protective layer 108 extends to position P5 by position P1, is used for the part of position P1 to position P5 of clad metal mesh grid 104.Finally, signal terminal 110 is formed at position P1, is used for transceiving radio frequency signal.

In miniature antenna 10, the length of position P2 to position P3 is about 3/4ths of wavelength X, the length of position P3 to position P5 is about 1/4th of wavelength X, and the length of the length of position P3 to position P4 and position P4 to position P5 all about slightly wavelength X 1/8th.In addition, when realizing miniature antenna 10, designer should needed for system, suitably the length of adjustment position P2 to position P3, position P3 each section to position P5, position P3 to position P4 and position P4 to position P5 etc., and reference experiment or analog result, finely tune the length of each section.For example, when miniature antenna 10 is applied to bluetooth or radio area network system, its centre frequency, near 2.4GHz, therefore by the length of each section of adjustment, can obtain the experimental result of Fig. 2 to Fig. 6.Wherein, Fig. 2 is the voltage standing wave ratio schematic diagram of miniature antenna 10, Fig. 3 is miniature antenna 10 in the statistical form of the antenna efficiency of different frequency, gain and average gain, and Fig. 4 to Fig. 6 is then respectively miniature antenna 10 in the radiation pattern figure of 2.5GHz, 2.45GHz and 2.4GHz.Therefore, from Fig. 2 to Fig. 6, miniature antenna 10 is one bipolar (Dipole) antenna, and its operation frequency range (being less than 2 for voltage standing wave ratio) meets the demand of bluetooth or radio area network system.

On the other hand, from Figure 1A and Figure 1B, miniature antenna 10 is developed by a cable and forms, and its its related production has many kinds, below enumerates two kinds.

Please refer to Fig. 7 A to Fig. 7 E, Fig. 7 A to Fig. 7 E is the schematic diagram of a Making programme of embodiment of the present invention miniature antenna 10.As shown in Figure 7 A, first obtain the cable of suitable length, it is respectively metal wire, insulating barrier, metal net and protective layer from inside to outside.Then, as shown in Figure 7 B, the position P3 of cable is divested to the protective layer on the P2 of position, metal net and insulating barrier, and only stays metal line portions, i.e. radiant body part.As seen in figure 7 c, the position P4 of cable is divested to the protective layer on the P3 of position and metal net, and stays insulating barrier and coated metal wire.As illustrated in fig. 7d, the position P5 of cable is divested to the protective layer on the P4 of position, and stays metal net, insulating barrier and coated metal wire.Finally, as seen in figure 7e, grounded metal pipe is inserted in cable position P5 on the P3 of position, and connects with metal net, earth terminal is inserted in simultaneously, to complete miniature antenna 10.

The Making programme of Fig. 7 A to Fig. 7 E take line segment as order, and another kind of mode is that order makes miniature antenna 10 with layer.Please refer to Fig. 8 A to Fig. 8 E, Fig. 8 A to Fig. 8 E is the schematic diagram of another Making programme of embodiment of the present invention miniature antenna 10.As shown in Figure 8 A, the cable of suitable length is first obtained.Then, as shown in Figure 8 B, the position P5 of cable is divested to the protective layer on the P2 of position, makes metal net exposed.As shown in Figure 8 C, position P4 is divested to the metal net of position P2, make insulating barrier exposed.As in fig. 8d, position P3 is divested to the insulating barrier of position P2, make metal wire exposed.Finally, as illustrated in fig. 8e, grounded metal pipe is inserted in cable position P5 on the P3 of position, and connects with metal net, earth terminal is inserted in simultaneously, to complete miniature antenna 10.

It is noted that Fig. 7 A to Fig. 7 E or Fig. 8 A to Fig. 8 E is used for the feasible Making programme of miniature antenna 10 is described, and these Making programme should to be those skilled in the art can not complete person easily with reference to the structure of miniature antenna 10.But being not limited thereto, other production method, as sequentially formed miniature antenna 10 etc. from inside to outside, is also feasible method.

Main purpose of the present invention is to utilize existing cable line to make bipolar miniature antenna 10, and therefore radiation body is the metal wire that diameter is about 2.5mm, can meet undersized demand.The more important thing is, can be demonstrate,proved by experimental result (as shown in Figures 2 to 6), miniature antenna 10 of the present invention has excellent radiation efficiency and field pattern in operational frequency bands, can effectively receive or send radiofrequency signal.In addition, because the impedance of cable is generally designed to 50 ohm, miniature antenna 10 can be made to have good matching effect, be more conducive to system combination.Meanwhile, miniature antenna 10 does not need the design of adapter, can reduce the energy loss that adapter causes, promote usefulness further.

In sum, miniature antenna of the present invention utilizes traditional electrical cable and makes, and except meeting undersized demand, the radiation efficiency that tool is excellent simultaneously and field pattern, can meet the requirement of wireless telecommunication system.

The foregoing is only preferred embodiment of the present invention, all equalizations done according to the claims in the present invention change and modify, and all should belong to covering scope of the present invention.

Claims

1. a miniature antenna, is used for transmitting-receiving one radiofrequency signal, includes:

Metal wire, extends to a second place by a primary importance;

Insulating barrier, extends to one the 3rd position by this primary importance, and be used for this primary importance of this metal wire coated to the part of the 3rd position, this primary importance is less than the length of this primary importance to this second place to the length of the 3rd position;

Metal net, extends to one the 4th position by this primary importance, and be used for this primary importance of this insulating barrier coated to the part of the 4th position, this primary importance is less than the length of this primary importance to the 3rd position to the length of the 4th position; And

Grounded metal pipe, extend to the 3rd position by one the 5th position, be used for the part of the 5th position to the 4th position of this metal net coated and the part of the 4th position of this insulating barrier coated to the 3rd position, 5th position is between this primary importance and the 4th position

Wherein the 3rd position to the length of this second place approximates four/three-wavelength of this radiofrequency signal, the length of the 5th position to the 3rd position approximates the quarter-wave of this radiofrequency signal, to form a dipole antenna, this dipole antenna can utilize a cable to be made.

2. miniature antenna as claimed in claim 1, wherein the length of the 5th position to the 4th position approximates 1/8th wavelength of this radiofrequency signal.

3. miniature antenna as claimed in claim 1, wherein the length of the 4th position to the 3rd position approximates 1/8th wavelength of this radiofrequency signal.

4. miniature antenna as claimed in claim 1, wherein this grounded metal pipe is electrically connected on the part of the 5th position to the 4th position of this metal net.

5. miniature antenna as claimed in claim 1, wherein the impedance of this metal wire is 50 ohm.

6. miniature antenna as claimed in claim 1, it separately comprises a signal terminal, is formed at this primary importance.

7. miniature antenna as claimed in claim 1, it separately comprises a protective layer, extends to the 5th position by this primary importance, is used for this primary importance of this metal net coated to the part of the 5th position.