CN102468531B - Multi-frequency antenna - Google Patents

Abstract

The invention discloses a multi-frequency antenna which comprises an insulating substrate, a main antenna arranged on the insulating substrate and a metal sheet. The main antenna comprises a feed-in part for feeding in signals, a first conductor arm which is connected with the feed-in part and is adjacent to a first side edge of the insulating substrate, a second conductor arm which is connected with the feed-in part and is shorter than the first conductor arm, a third conductor arm which is connected with the feed-in part to transmit radio-frequency signals, a fourth conductor arm which extends along the edge of the third conductor arm to couple the radio-frequency signals, and a grounding part which is adjacent to the feed-in part; the metal sheet is fixed on the first side of the insulating substrate and connected with the fourth conductor arm, resonates and couples with the first conductor arm to form a first radiation section together, and forms a second radiation section together with the fourth conductor arm. Therefore, the efficacy and the purpose of multi-band operation are achieved.

Description

multi-frequency antenna

technical field

The present invention relates to a multi-frequency antenna, in particular to a multi-frequency antenna applicable to the long-term evolution technology (LTE).

Background technique

Long Term Evolution (LTE for short) technology is a new generation of mobile wireless broadband technology that has attracted much attention in the field of wireless communication. The so-called LTE refers to the ability to achieve a downlink transmission rate of 100Mbit/s and an uplink transmission rate of 50Mbit/s under a 20MHz bandwidth, and it is backward compatible and supports the existing 3G system. It allows service providers to pass more economical Provide wireless broadband services in a way that surpasses the performance of today's 3G wireless networks and brings better performance. In view of the fact that the operating bands (Operating Band) defined by various countries for LTE are shown in Table 1 below, they need to cover 698-960MHz, 1710-2170MHz and 2500-2700MHz. The low-frequency bandwidth that can be operated cannot meet the requirements of LTE.

Therefore, how to conceive an antenna that can cover the above-mentioned LTE frequency band and other frequency bands including GSM850, EGSM900, PCS1800, DCS1900 and WCDMA2100, and has sufficient operating bandwidth is the key point of the present invention.

Table 1

Contents of the invention

Therefore, it is an object of the present invention to provide a multi-frequency antenna that can cover multiple operating frequency bands.

To achieve the above purpose, the multi-frequency antenna of the present invention includes an insulating substrate, a main antenna and a metal sheet. The main antenna is arranged on a surface of the insulating substrate, and includes: a feeding part, a first conductor arm, a second conductor arm, a third conductor arm, a fourth conductor arm and a grounding part.

The feed-in part is used to feed in a radio frequency signal; the first conductor arm is connected to the feed-in part, and extends outward along a first side of the insulating substrate to a second side adjacent to the first side of the insulating substrate. side; the second conductor arm is connected to the feed-in part, and is adjacent to the first conductor arm and shorter than the first conductor arm; the third conductor arm is connected to the feed-in part, and is close to the insulating substrate and the The third side opposite to the second side extends to transmit the radio frequency signal; the fourth conductor arm is spaced apart from the third conductor arm and extends along the edge of the third conductor arm to couple the radio frequency signal, and is separated by the insulation The first side of the substrate extends to a fourth side opposite to the first side; the ground portion is disposed on the fourth side of the insulating substrate and adjacent to the feed-in portion.

The metal sheet is fixed on the first side of the insulating substrate and connected to the fourth conductor arm, which resonates and couples with the first conductor arm to form a first radiating segment together, and forms a second radiating segment together with the fourth conductor arm part.

Preferably, in order to properly adjust the operating frequency band of the second radiating section, the main antenna further includes a fifth conductor arm, which is located on the side of the fourth conductor arm that is not adjacent to the third conductor arm, and extends to The first side of the insulating substrate is connected to an end of the metal sheet, and forms the second radiation section together with the fourth conductor arm and the metal sheet.

Preferably, in order to properly adjust the operating frequency band of the first radiating section, the main antenna further includes an extension section disposed on the first side of the insulating substrate and connected to the other end of the metal sheet, which faces the first The conductor arm protrudes to be coupled with the first conductor arm.

Preferably, the main antenna further includes a common section for connecting one end of the first conductor arm and the second conductor arm, a wire connecting the common section and the feed-in part, and a wire connecting the ground part and the fourth conductor. conductive copper foil.

The effect of the present invention is to utilize the resonance and coupling of the first conductor arm and the metal sheet to generate multi-modes to meet the requirements of working at low frequency and wide frequency (698-960MHz), and to generate a high frequency (1710-2170MHz) through the metal sheet Mode, and use the third conductor arm to couple with the fourth conductor arm to adjust the high frequency matching, while the second conductor arm resonates another higher frequency (2500-2700MHz) mode, so that the multi-frequency antenna can include Multiple operating frequency bands including the LTE frequency band can indeed achieve the efficacy and purpose of the present invention.

Description of drawings

Fig. 1 is a schematic perspective view of the structure of a preferred embodiment of the multi-frequency antenna of the present invention;

Fig. 2 is a schematic diagram of the transmission direction of the radio frequency signal on the first conductor arm, the second conductor arm and the third conductor arm of the multi-frequency antenna of the present embodiment;

Fig. 3 is a schematic diagram of the transmission direction of the radio frequency signal on the fourth conductor arm, the metal sheet and the fifth conductor arm of the multi-frequency antenna of the present embodiment;

Fig. 4 is the dimensional drawing of the multi-frequency antenna of the present embodiment;

Fig. 5 is a schematic diagram of the position of the multi-frequency antenna provided on the notebook computer in this embodiment;

Fig. 6 is the measured result of the voltage standing wave ratio (VSWR) of the multi-frequency antenna of the present embodiment; and

7 to 12 are radiation pattern diagrams of the multi-frequency antenna in this embodiment at different operating frequencies.

Description of main component symbols

100 multi-frequency antenna

1 Insulation substrate 2 Main antenna

3 metal sheet 4 coaxial cable

5 laptops

10 Surface 11 First Side

12 second side 13 third side

14 fourth side 20 groove

21 Feed-in part 22 First conductor arm

23 second conductor arm 24 third conductor arm

25 Fourth conductor arm 26 Grounding part

27 Extension section 28 Fifth conductor arm

29 Conductive copper foil 31 Connection

32 First Paragraph 33 Second Paragraph

41 Signal wire 42 Ground wire

51 Cover body 201 Common section

202 wire

Detailed ways

The aforementioned and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the accompanying drawings.

Referring to FIG. 1 , it is a preferred embodiment of the multi-frequency antenna of the present invention. The multi-frequency antenna 100 of this embodiment includes an insulating substrate 1 , a main antenna 2 and a metal sheet (iron piece) 3 .

The insulating substrate 1 is a rectangular board with a size of 73.7mm×14mm×3mm.

The main antenna 2 is arranged on a surface 10 of the insulating substrate 1, and includes a feed-in portion 21, a first conductor arm 22, a second conductor arm 23, a third conductor arm 24, a fourth conductor arm 25 and a ground Section 26.

The feed-in portion 21 is approximately rectangular, and is located at the center right of the insulating substrate 1 for connecting with the signal line 41 of the coaxial cable 4 to feed in a radio frequency signal.

One end of the first conductor arm 22 and the second conductor arm 23 are connected to a common section 201, and the common section 201 is connected to the feed-in part 21 through a wire 202, so as to feed radio frequency signals to the first conductor arm 22 and the second conductor arm 23, as shown in the direction of the arrow in Figure 2. The first conductor arm 22 is spaced apart from a first side 11 of the insulating substrate 1 and extends approximately parallel to the first side 11 of the insulating substrate 1 to a side adjacent to the first side 11 of the insulating substrate 1 . the second side 12 . And the end section of the first conductor arm 22 is designed to be bent at 90 degrees.

The second conductor arm 23 is adjacent to (spaced apart from) the first conductor arm 22 and extends roughly in parallel, and the first conductor arm 22 is shorter than the second conductor arm 23 .

The third conductor arm 24 is connected to the feed-in portion 21 with a groove 20 between them, and the third conductor arm 24 is directed from the feed-in portion 21 to a third side 13 opposite to the second side 12 of the insulating substrate 1 The direction is extended to transmit radio frequency signals, as shown in the direction of the arrow in FIG. 2 .

The fourth conductor arm 25 extends from the first side 11 of the insulating substrate 11 to the fourth side 14 opposite to the first side 11, and is partially adjacent to (close to) the edge of the third conductor arm 24 to couple the radio frequency signal, As shown in the direction of the arrow in Figure 3.

The ground portion 26 is disposed on the fourth side 14 of the insulating substrate 1 and adjacent to the feeding portion 21 for connecting with the ground wire 42 of the coaxial cable 4 .

The metal sheet 3 is roughly in the shape of a long strip, which is fixed on the first side 11 of the insulating substrate 1 approximately perpendicular to the insulating substrate 1, and connected to one end of the fourth conductor arm 25, thus, as shown by the arrow in FIG. 3 As shown in the direction, the radio frequency signal can be transmitted to the two ends of the metal sheet 3 by the fourth conductor arm 25 and the connection 31 of the metal sheet 3, so that the first section 32 of the metal sheet 3 extending leftward from the connection 31 is connected to the adjacent first section 32. The conductor arms 22 resonate and couple to form a first radiating segment together, and the second segment 33 extending rightward from the connection 32 of the metal sheet 3 and the fourth conductor arm 25 jointly form a second radiating segment.

And in order to adjust the length of the first radiating section to make it operate in a specific frequency band, the first radiating section of this embodiment further includes a first section 32 arranged on the first side 11 of the insulating substrate 1 and connected to the metal sheet 3 The end-connected extension section 27 protrudes toward the end of the first conductor arm 22 so as to be coupled with the first conductor arm 22 . And in order to adjust the length of the second radiating section to operate in a specific frequency band, the second radiating section of the present embodiment further includes a fifth conductor arm 28, which is arranged on the fourth conductor arm 25 not connected to the third conductor arm 24 , the fifth conductor arm 28 is approximately parallel to the fourth conductor arm 25 , and one end thereof is connected to the end of the second segment 33 of the metal sheet 3 .

In this embodiment, the total length of the first radiating section is greater than the second radiating section 26, and the total length of the second radiating section is greater than the second conductor arm 23, and the total length of the first radiating section is designed so that the first radiating section Section resonance is in the first frequency band 698-960MHz, and the total length design of the second radiating section can make the second radiating section resonate in a second frequency band 1710-2170MHz higher than the first frequency band, and the length design of the second conductor arm 23 , the second conductor arm 23 can be resonated in a third frequency band 2500-2700 MHz higher than the second frequency band. The overall size of the multi-frequency antenna 100 in this embodiment is 73.7mm×14mm×3mm. The detailed dimensions (unit: mm) of the main antenna 2 and the metal sheet 3 are shown in FIG. 4 .

Moreover, in order to increase the grounding area of the antenna, in this embodiment, an additional conductive copper foil 29 may be provided to connect with the grounding portion 26 and the fourth conductor arm 25 respectively.

As shown in FIG. 5 , the multi-frequency antenna 100 of this embodiment is usually disposed on the cover 51 of a notebook computer 5 , on the side above the display.

As shown in Figure 6, it is the voltage standing wave ratio (VSWR) measured result of the multi-frequency antenna 100 of the present embodiment, it can be seen that the multi-frequency antenna 100 operates in the frequency bands 698-960MHz, 2170-2700MHz and 2500- The voltage standing wave ratio (VSWR) within 2700MHz is less than 3, meeting the industry's requirements for antenna radiation efficiency.

See Table 2 and Table 3 below, which are the total radiation power (Tot.Rad.Pwr.) and radiation efficiency percentage (Efficiency%) of the multi-frequency antenna 100 in this embodiment at each operating frequency (Frequency).

Table 2 Table 3

Referring to FIG. 7 to FIG. 12 , they are radiation pattern diagrams of the multi-frequency antenna 100 in this embodiment at different operating frequencies. It can be seen from the figures that the radiation pattern of the multi-frequency antenna 100 has good omnidirectionality.

To sum up, the multi-frequency antenna 100 of this embodiment utilizes two low-frequency paths, that is, the first conductor arm 22 and the first segment 32 of the metal sheet 3 to resonate and couple to generate multi-modes to achieve low-frequency and wide-band operation. (698-960MHz), and a high-frequency (1710-2170MHz) mode is generated by the second section 33 of the metal sheet, and the third conductor arm 24 is coupled with the fourth conductor arm 25 to adjust the high-frequency matching, and The second conductor arm 23 resonates another higher frequency (2500-2700MHz) mode, so that the working frequency band of the multi-frequency antenna 100 not only includes the GSM850, EGSM900, PCS1800, DCS1900 and WCDMA2100 frequency ranges, but also covers the LTE frequency range. The working frequency bands are 698-798MHz and 2500-2700MHz, which indeed achieve the efficacy and purpose of the present invention.

What is described above is only preferred embodiment of the present invention, can not limit the scope of the present invention implementation with this, promptly all simple equivalent changes and modifications done according to the claims of the present invention and description of the invention, all still belong to this invention. within the scope of invention patents.

Claims (8)

1. a multifrequency antenna, comprising:

Insulated substrate;

Main antenna, be located at a surface of this insulated substrate, it is characterized in that, this main antenna comprises:

Feeding portion, for feed-in one radiofrequency signal;

First conductor arm, is connected with this feeding portion, and extends out to a second side adjacent with this first side of this insulated substrate along a first side of this insulated substrate;

Second conductor arm, is connected with this feeding portion, and adjacent with this first conductor arm and be shorter than this first conductor arm;

3rd conductor arm, is connected with this feeding portion, and extends towards the 3rd side contrary with this second side close to this insulated substrate, to transmit this radiofrequency signal;

4th conductor arm, extends with this radiofrequency signal that is coupled along the edge of the 3rd conductor arm at intervals with the 3rd conductor arm, and extends to the four side contrary with this first side by the first side of this insulated substrate; And

Grounding parts, is located at four side also this feeding portion contiguous of this insulated substrate; And

Sheet metal, is fixed on the first side of this insulated substrate and is connected with the 4th conductor arm, and it resonates with this first conductor arm and is coupled and jointly forms one first radiant section, and jointly forms one second radiant section with the 4th conductor arm.

2. according to multifrequency antenna according to claim 1, wherein this second radiant section also comprises the 5th conductor arm, it is positioned at not adjacent with the 3rd conductor arm side of the 4th conductor arm, and extends to the first side of this insulated substrate and be connected with an end of this sheet metal.

3., according to multifrequency antenna according to claim 1, wherein this main antenna also comprises the first side that is located at this insulated substrate, and the extension be connected with another end of this sheet metal, it protrudes out towards this first conductor arm, to be coupled with this first conductor arm.

4., according to the multifrequency antenna described in claim 1,2 or 3, wherein this main antenna also comprises the wire that a common sections and supplying this first conductor arm and second conductor arm one end to connect connects this common sections and this feeding portion.

5., according to multifrequency antenna according to claim 4, wherein this main antenna also comprises a copper-foil conducting electricity be connected with this grounding parts and the 4th conductor arm.

6. according to multifrequency antenna according to claim 4, also comprise a coaxial cable, the holding wire of this coaxial cable is connected with this feeding portion, and the earth connection of this coaxial cable is connected with this grounding parts.

7. according to multifrequency antenna according to claim 4, wherein this first radiant section can resonate in one first frequency range, this second radiant section can resonate in one higher than the second frequency range of this first frequency range, and this second conductor arm can resonate in one higher than the 3rd frequency range of this second frequency range.

8. according to multifrequency antenna according to claim 7, wherein this first frequency range comprises 698-960MHz, this second frequency range comprises 1710-2170MHz, and the 3rd frequency range comprises 2500-2700MHz.