CN102315514A

CN102315514A - Miniaturized antenna

Info

Publication number: CN102315514A
Application number: CN201010221765XA
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: 2012-01-11
Anticipated expiration: 2030-07-09
Also published as: CN102315514B

Abstract

The invention discloses a miniaturized antenna. The miniaturized antenna is used for receiving and transmitting a radio frequency signal and comprises a metal line, an insulating layer, a metal woven net, and a grounding metal tube, wherein the metal line is extended from a first position to a second position; the insulating layer is extended from the first position to a third position and is used for coating the part, from the first position to the third position, of the metal line; the metal woven net is extended from the first position to a fourth position and is used for coating the part, from the first position to the fourth position, of the insulating layer; and the grounding metal tube is extended from a fifth position to the third position, and is used for coating the part, from the fifth position to the fourth position, of the metal woven net, and coating the part, from the fourth position to the third position, of the insulating layer.

Description

Miniature antenna

Technical field

The present invention relates to a kind of miniature antenna, especially relate to a kind of small size, have good radiation efficiency and field pattern, and can satisfy the miniature antenna of wireless telecommunication system demand.

Background technology

Antenna is used for launching or the reception radio wave, to transmit or the exchange radio signal.The electronic product of general tool wireless communication function like portable wireless communication devices such as notebook computer, Smartphones, comes the access wireless network through built-in antenna usually.Therefore, in order to let user's access wireless communication network more easily, the frequency range of ideal antenna should increase in tolerance band as much as possible, and size then should reduce as far as possible, so that aerial integration is gone in the portable wireless communication device.

Summary of the invention

Therefore, main purpose of the present invention promptly is to provide a kind of miniature antenna, to address the above problem.

The objective of the invention is to realize like this, promptly disclose a kind of miniature antenna, be used for receiving and dispatching a radiofrequency signal, include 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, is used for coating the part of this primary importance of this metal wire to the 3rd position, and the length of this primary importance to the 3rd position is less than the length of this primary importance to this second place; One metal knitted stratum reticulare extends to one the 4th position by this primary importance, is used for coating the part of this primary importance of this insulating barrier to the 4th position, and the length of this primary importance to the 4th position is less than the length of this primary importance to the 3rd position; An and grounded metal pipe; Extend to the 3rd position by one the 5th position; Be used for coating the part of the 5th position of this metal knitted net to the 4th position; And the part of the 4th position to the 3rd position of this insulating barrier of coating, the 5th position is between this primary importance and the 4th position.

Description of drawings

Figure 1A is the schematic appearance of the embodiment of the 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 sketch map of the miniature antenna of Figure 1A;

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

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

Fig. 7 A to Fig. 7 E be Figure 1A miniature antenna one make the sketch map of flow process;

Fig. 8 A to Fig. 8 E is that another of miniature antenna of Figure 1A made the sketch map of flow process.

The main element symbol description

10 antennas

100 metal wires

102 insulating barriers

104 metal knitted 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 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; Be used for receiving and dispatching the radiofrequency signal that wavelength is λ, it mainly is made up of the metal knitted net of a metal wire 100, an insulating barrier 102, one 104, a grounded metal pipe 106, a

protective layer

108 and 110 of signal terminals.For clearly demonstrating the framework of miniature antenna 10, five position P1, P2, P3, P4, P5 have been indicated among Figure 1A and Figure 1B.In detail, metal wire 100 extends to position P2 by position P1, and wherein the part of position P1 P3 to the position of metal wire 100 can be considered holding wire, and the part of position P3 P2 to the position then is a radiant body.Insulating barrier 102 extends to position P3 by position P1, is used for the part of P1 P3 to the position in position in the clad metal line 100, its material can be iron not insulation material such as dragon is made, but not as limit.Metal knitted net 104 extends to position P4 by position P1, is used for the part of P1 P4 to the position in position in the coated insulation layer 102, so that the metallic shield effect to be provided.Grounded metal pipe 106 extends to position P3 by position P5; Its material can be metal materials such as copper; Be used for ground connection, wherein the part of position P5 P4 to the position of grounded metal pipe 106 coats and is electrically connected on metal knitted net 104, and the part of position P4 P3 to the position is coated insulation layer 102 then.Protective layer 108 extends to position P5 by position P1, is used for the part of position P1 P5 to the position of clad metal mesh grid 104.At last, signal terminal 110 is formed at position P1, is used for receiving and dispatching radiofrequency signal.

In miniature antenna 10; The length of position P2 P3 to the position is about 3/4ths of wavelength X; The length of position P3 P5 to the position is about 1/4th of wavelength X, and all about slightly wavelength X of the length of the length of position P3 P4 and position P4 P5 to the position to the position 1/8th.In addition; When realizing miniature antenna 10, the designer should be required according to system, suitably adjusts the length of position P2 P3, position P3 P5, position P3 P4 and position P4 each section such as P5 to the position to the position to the position to the position; And reference experiment or analog result, finely tune the length of each section.For instance, when miniature antenna 10 was applied to bluetooth or radio area network system, its centre frequency therefore through the length of each section of adjustment, can get the experimental result of Fig. 2 to Fig. 6 near 2.4GHz.Wherein, Fig. 2 is the voltage standing wave ratio sketch map of miniature antenna 10; Fig. 3 is the statistical form of miniature antenna 10 in antenna efficiency, gain and the average gain of different frequency, and Fig. 4 to Fig. 6 then is respectively the radiation pattern figure of miniature antenna 10 in 2.5GHz, 2.45GHz and 2.4GHz.Therefore, can know that miniature antenna 10 is one bipolar (Dipole) antenna, and its operation frequency range (is example less than 2 with voltage standing wave ratio) meets the demand of bluetooth or radio area network system by Fig. 2 to Fig. 6.

On the other hand, can be known by Figure 1A and Figure 1B that miniature antenna 10 is developed by a cable and forms, 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 that one of embodiment of the invention miniature antenna 10 is made the sketch map of flow process.Shown in Fig. 7 A, obtain the cable of suitable length earlier, it is respectively metal wire, insulating barrier, metal knitted net and protective layer from inside to outside.Then, shown in Fig. 7 B, the position P3 of cable is divested to protective layer, metal knitted net and insulating barrier on the P2 of position, and only stay the metal wire part, be i.e. the radiant body part.Shown in Fig. 7 C, the position P4 of cable is divested to protective layer and metal knitted net on the P3 of position, and the metal wire that stays insulating barrier and coated.Shown in Fig. 7 D, the position P5 of cable is divested to the protective layer on the P4 of position, and the metal wire that stays metal knitted net, insulating barrier and coated.At last, shown in Fig. 7 E, the grounded metal pipe box is gone into cable position P5 to the P3 of position, and join, simultaneously earth terminal is inserted in, to accomplish miniature antenna 10 with metal knitted net.

The making flow process of Fig. 7 A to Fig. 7 E is order with the line segment, and another kind of mode is to be that order is processed miniature antenna 10 with the layer.Please refer to Fig. 8 A to Fig. 8 E, Fig. 8 A to Fig. 8 E is the sketch map of another making flow process of embodiment of the invention miniature antenna 10.Shown in Fig. 8 A, obtain the cable of suitable length earlier.Then, shown in Fig. 8 B, the position P5 of cable is divested to the protective layer on the P2 of position, make metal knitted net exposed.Shown in Fig. 8 C, the metal knitted net of position P4 P2 to the position is divested, make insulating barrier exposed.Shown in Fig. 8 D, the insulating barrier of position P3 P2 to the position is divested, make metal wire exposed.At last, shown in Fig. 8 E, the grounded metal pipe box is gone into cable position P5 to the P3 of position, and join, simultaneously earth terminal is inserted in, to accomplish miniature antenna 10 with metal knitted net.

Be noted that Fig. 7 A to Fig. 7 E or Fig. 8 A to Fig. 8 E are used for explaining the feasible making flow process of miniature antenna 10, and these to make flow processs should be that this area tool knows that usually the knowledgeable is with reference to the completion person easily of the structure institute of miniature antenna 10.Yet, being not limited thereto, other production method as forming miniature antenna 10 etc. from inside to outside in regular turn, also is feasible method.

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

In sum, miniature antenna of the present invention is to utilize the traditional electrical cable and process, and except that meeting undersized demand, good radiation efficiency and the field pattern of tool can satisfy the requirement of wireless telecommunication system simultaneously.

The above is merely preferred embodiment of the present invention, and all equalizations of doing according to claim of 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 receiving and dispatching a 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, is used for coating the part of this primary importance of this metal wire to the 3rd position, and the length of this primary importance to the 3rd position is less than the length of this primary importance to this second place;

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

The grounded metal pipe; Extend to the 3rd position by one the 5th position; Be used for coating the part of the 5th position of this metal knitted net to the 4th position, and coat the part of the 4th position to the 3rd position of this insulating barrier, the 5th position is between this primary importance and the 4th position.

2. miniature antenna as claimed in claim 1, wherein the length of the 3rd position to this second place approximates four/three-wavelength of this radiofrequency signal.

3. miniature antenna as claimed in claim 1, wherein the 5th position approximates the quarter-wave of this radiofrequency signal to the length of the 3rd position.

4. 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.

5. 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.

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

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

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

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