CN1199319C

CN1199319C - Broadband dual-frequency antenna

Info

Publication number: CN1199319C
Application number: CNB011220406A
Authority: CN
Inventors: 林芳利
Original assignee: QIMEI DIGITAL CO Ltd
Current assignee: QIMEI DIGITAL CO Ltd
Priority date: 2001-06-25
Filing date: 2001-06-25
Publication date: 2005-04-27
Anticipated expiration: 2021-06-25
Also published as: CN1393956A

Abstract

The present invention relates to an antenna which comprises a conductive earthing flat plate, a conductive first flat plate, a conductive connecting body and a signal interface which is provided with two contact points, wherein the conductive earthing flat plate is arranged along the horizontal direction; the conductive first flat plate is arranged on the upper part of the earthing flat plate; the first flat plate is separated with a fixed distance from the earthing flat plate; the first flat plate comprises a first resonance area, a second resonance area and a third resonance area; the dimensions of each resonance area are respectively corresponding to the wavelengths of a first frequency, a second frequency and a third frequency of the antenna; a connecting area is respectively connected with the first resonance area, the second resonance area and the third resonance area. Both ends of a connecting body are respectively connected with the connecting area of the earthing flat plate and the first flat plate. Two contact points of the signal interface are respectively and electrically connected with the earthing flat plate and the first flat plate.

Description

The dual-band antenna of wideband

Technical field

The present invention provides a kind of flat plane antenna, and particularly a kind of frequency band links to each other and can increase the flat plane antenna of frequency range.

Background technology

In the information life in modern times, everyone wishes to obtain Useful Information whenever and wherever possible easily; And the wireless telecommunications equipment in use must optical fiber, cable just can transmission signal, transmits the splendid approach of information beyond doubt.Along with development of technology, various portable wireless telecommunications equipment (similarly being mobile phone), it is characteristic easily lightly, has also become the important information interchange instrument of modern.

In the wireless telecommunications equipment, be used for launching the reception radio wave to transmit the antenna of exchange radio data signal, be undoubtedly one of most important element.Especially in the portable wireless communication equipment in modern times, not only antenna compact (to cooperate the characteristic of portable wireless communication equipment) is preferably also wanted to operate in double frequency, and frequency range is also wideer.As everyone knows, in order to want to bring into play the characteristic of wireless telecommunications, the radio data signal can be modulated with different frequencies, be allowed the radio data signal after modulating to increase the capacity of radio signals transmission via different frequency band (frequency band) transmission.Similarly be the pan-European mobile telephone system (GSM, Global System forMobile Communications) of present mobile phone communication standard, it is the frequency band of two wireless transmission of 900 and 1,800 megahertzes (MHz, i.e. MHz) that main frequency is just arranged.In order to want to launch/to receive the radio data signal of double frequency-band, the antenna in the wireless telecommunications equipment is also wanted to operate in double frequency-band naturally.In addition, along with degree (weighing with the bit number that transmits in the unit interval sometimes) increase of data aggregation in the radio data signal, the frequency range of antenna operation time-frequency band (bandwidth) also will increase thereupon.

Please refer to Fig. 1.Fig. 1 is a United States Patent (USP) the 5th, 926, the external view of No. 139 disclosed traditional antennas 10.First flat board 12, a conduction and the two ends that traditional antenna 10 has ground connection flat board 14, a conduction of a conduction and is located at dull and stereotyped 14 tops of ground connection are connected to the connector 18 of dull and stereotyped 14 and first flat board 12 of ground connection, and the signal interface 19 that two contacts are arranged.One end of signal interface 19 is an earth terminal, is electrically connected on ground plane 14; The other end is the signal end, is electrically connected in first flat board 12 at contact 16.The document signal that will be sent or be accepted by antenna 10 by antenna 10 is just by 19 feed-ins of signal interface or feed out antenna 10.Connector 18 is a short circuit pin (short pin), is used for connecting first flat board 12 and ground connection flat board 14.For can be in dual-band operation, first flat board of traditional antenna 10 has two resonance ranges (resonating area) 17A, 17B; A frequency band of respective antenna 10 operation separately.Other are as the disclosed antenna of European patent (european patent) EP 0997974A1, and are also approximate with antenna 10, and first flat board that is provided with two resonance ranges is arranged.

For illustrating further the design principle of traditional antenna 10, please refer to Fig. 2.Fig. 2 is the schematic diagram of the reflection coefficient (reflection) of traditional antenna 10 with frequency change, and its transverse axis is a frequency; The longitudinal axis is reflection coefficient (absolute value).The reflection coefficient of antenna can be used to weigh the frequency range of antenna operation frequency band; Generally (dB, frequency range decibel) is as the exercisable frequency band of antenna less than-10 decibels with reflection coefficient.As shown in Figure 2, two of antenna 10

resonance portion

17A, 17B (being shown in Fig. 1) just correspond respectively to antenna 10 and are distributed in two frequency band A1 and A2 near frequency f a and the fb; Also therefore traditional antenna 10 can operate in two frequency bands.

The moulding of traditional antenna 10 this flat plane antennas (planar antenna) is flat, quite is fit to be embedded in the portable wireless communication equipment as mobile phone etc., makes it not have outstanding antenna part.Yet traditional antenna 10 has the problem of frequency range deficiency, especially at the higher frequency band of frequency.In general, the frequency range of antenna 10 be increased, the size of corresponding resonance range will be increased.But the size that increases resonance range will increase the total area and the volume of antenna, can't meet the compact requirement of portable wireless communication equipment.With pan-European Mobile Communications system, near the frequency band of its specification requirement 1,800 megahertzes will have the frequency range of 170 megahertzes; But, under requiring, stock size can't reach frequency range like this as the design of traditional antenna 10.

Summary of the invention

Therefore, main purpose of the present invention is to provide the double-frequency planar antenna of a wideband, to solve the shortcoming of traditional antenna bandwidth deficiency.

For this reason, the invention provides a kind of antenna, it includes:

The ground connection flat board of one conduction, the along continuous straight runs setting;

First flat board of one conduction, along continuous straight runs are located at this ground connection flat board top, with this ground connection flat board fixed range of being separated by; This first flat board includes:

First, second and third resonance range, the size of each resonance range correspond respectively to the wavelength of first, second and third frequency of this antenna operation; And

One join domain is connected with this first, second and third resonance range respectively;

The connector of one conduction, the two ends of this connector are connected to the join domain of this ground connection flat board and this first flat board; And

One is provided with the signal interface of two contacts; This two contact is electrically connected in dull and stereotyped and this first flat board of this ground connection respectively;

Wherein this first, second and the 3rd frequency different and correspond respectively to first frequency band, second frequency band and the 3rd frequency band of this antenna operation;

This second frequency is close with the 3rd frequency, and allow this second frequency band overlap and make this second frequency band be linked to each other with the 3rd frequency band with the 3rd frequency band,

Wherein this first, second or the 3rd resonance range also comprise a projection, be positioned at that end that resonance range is not connected with join domain, dull and stereotyped this first flat board that protrudes in first slab towards ground connection.

Description of drawings

Fig. 1 is the external view of traditional antenna;

Fig. 2 is the schematic diagram of the reflection coefficient of antenna among Fig. 1 with frequency change.

Fig. 3 A is the external view of antenna one embodiment of the present invention.

Fig. 3 B is the element figure of antenna among Fig. 3 A.

Fig. 3 C is an end view of antenna among Fig. 3 A.

Fig. 3 D is the opposite side view of antenna among Fig. 3 A.

Fig. 3 E is the vertical view of antenna first flat board among Fig. 3 A.

Fig. 3 F is the schematic diagram of antenna first flat panel configurations among Fig. 3 A.

Fig. 4 is the schematic diagram of the reflection coefficient of antenna of the present invention with frequency change.

Fig. 5 to Figure 10 is respectively the schematic diagram of six kinds of embodiment of antenna first flat board of the present invention.

Figure 11 A is the schematic diagram of another embodiment of antenna of the present invention.

Figure 11 B is an end view of antenna among Figure 11 A.

Figure 11 C is the opposite side view of antenna among Figure 11 A.

Figure 11 D is the stereogram of first flat board of antenna among Figure 11 A.

Figure 12 A is the schematic diagram of another embodiment of antenna of the present invention.

Figure 12 B is an end view of antenna among Figure 12 A.

Figure 12 C is the opposite side view of antenna among Figure 12 A.

The symbol description of accompanying drawing:

20,100,110 antennas of the present invention

22,42,52,62,72,82,92,102,112 first planes

23A first resonance range

23B second resonance range

23C the 3rd resonance range

24,104,114 ground planes

25A, 25B, 25C path

26,106,116 connectors

The contact jaw of 26A, 46A, 56A, 66A, 76A, 86A, 96A, 106A, 116B connector

27 slits

28,108,118 signal interfaces

28A, 48A, 58A, 68A, 78A, 88A, 98A, 108A, 118B contact

103,105,113,115 projections

3C, 3D, 12B, 12C, 13B, 13C arrow

120A, 120B, 120C end points

45C, 52C, 62B, 72A, 72B, 82B, 82C, 92B, 92C resonance range

F1, f2, f3 frequency

B1, B2, B3, B4 frequency band

The H1 distance

Embodiment

Please refer to Fig. 3 A, Fig. 3 B, Fig. 3 C and Fig. 3 D.Fig. 3 A is the external view of the antenna 20 of one embodiment of the invention, and Fig. 3 B is the composed component figure of antenna 20, and Fig. 3 C is the end view that antenna 20 is looked by arrow 3C direction; Fig. 3 D is the end view (direction of arrow 3C and 3D is please referring to Fig. 3 A) that antenna 20 is looked by arrow 3D direction.Antenna 20 has all along continuous straight runs settings of ground connection flat board 24, two planes of first dull and stereotyped 22 and one conduction of a conduction, each other at a distance of a distance H 1 (please refer to Fig. 3 C and Fig. 3 D) of fixing and parallel to each other.Dull and stereotyped 24 and first dull and stereotyped 22 of ground connection have a conduction connector 26 as short circuit pin (short pin) in addition, and its two ends are connected to first flat board 22 and ground connection flat board 24 respectively.The contact jaw 26A that dotted line marks among Fig. 3 A, Fig. 3 B is exactly first flat board 22 part that links to each other with connector 26.29 in dotted line among Fig. 3 B indicates first flat board 22 and is projected in position on the ground connection flat board 24.In addition, antenna 20 also has a signal interface 28 (not being shown in Fig. 3 C and Fig. 3 D); Signal interface 28 is provided with two contacts, is electrically connected in contact 28A on first flat board 22 and the contact 28B on the ground connection flat board 24 respectively.Signal that will be sent by antenna 20 or the signal of being accepted by antenna 20 all can be via 28 feed-ins of signal interface, feed out.In some portable wireless communication equipment, printed circuit board (PCB) (the PCB of its internal circuit (the signal interface that comprises antenna), Printed Circuit Board) ground plane is just arranged, and antenna of the present invention just can be directly with the ground plane of this printed circuit board (PCB) ground connection flat board as antenna, another contact of signal interface 28 then still is electrically connected at contact 28A with first flat board 22.

For the shape of first flat board 22 that illustrates further antenna 20 and the meaning of design thereof, please refer to Fig. 3 E and Fig. 3 F.Fig. 3 E is the vertical view of first flat board 22 of antenna 20, and Fig. 3 F then is each regional schematic diagram on first flat board 22.Distinguish each zone by slit (slot) 27 (being the dotted line among Fig. 3 E) on first flat board 22; As for the configuration in each zone, please further with reference to figure 3F.Having marked four zones with dotted line among Fig. 3 F, is respectively the Position Approximate of the first resonance range 23A, the second resonance range 23B, the 3rd resonance range 23C and join domain 23D.Can find out by Fig. 3 E and Fig. 3 F, do at interval with slit mutually between the first resonance range 23A, the second resonance range 23B and the 3rd resonance range 23C, and be connected in join domain 23D jointly.Please note the contact jaw 26A that is connected with connector 26 (not being shown in Fig. 3 E and F) on first flat board 22, and all be located on the join domain 23D with contact 28A that signal interface 28 (not being shown in Fig. 3 E and F) is electrically connected.The size of the first resonance range 23A, the second resonance range 23B and the 3rd resonance range 23C corresponds respectively to the wavelength of antenna 20 exercisable first, second and third frequencies.More particularly, in the first resonance range 23A, signal interface 28 is by the electric current of dull and stereotyped 24 feed-ins of ground connection, flow into the contact jaw 26A of first flat board 22 via connector 26, pass the whole piece path (what approximately path 25A was illustrated among the image pattern 3F) that join domain 23D flow to the end points 120A of first resonance range 22 at last, its path length is equivalent to 1/4th of first frequency corresponding wavelength generally.In like manner, electric current is by the path (approximately path 25B is illustrated among the image pattern 3F) of the end points 120B of ground connection flat board 24, connector 26, contact jaw 26A, join domain 23D, second resonance range 23B to the second resonance range, and its length is 1/4th of second frequency corresponding wavelength generally.Pass through the path 25C that the 3rd resonance range 23C arrives end points 120C, its length is exactly 1/4th of the 3rd frequency corresponding wavelength generally.

As for antenna 20 work principle of the present invention, available Fig. 4 illustrates.Please refer to Fig. 4.Fig. 4 is the schematic diagram of the reflection coefficient of antenna 20 with frequency change.As previously mentioned, reflection coefficient is lower than-10 decibels frequency range and can be used as the exercisable frequency band of antenna.In antenna 20 of the present invention, first, second and third resonance range is arranged, correspond to antenna 20 exercisable first, second and third frequency bands respectively, be exactly frequency band B1, B2, the B3 among Fig. 4.And first, second and third frequency band can be respectively with the representative of first, second and third frequency, the frequency f 1, f2 and the f3 that just indicate among Fig. 4.When design antenna of the present invention, but the size of each resonance range of appropriate change, and the frequency values of the f1 that adjusts frequency, f2 and f3 separates frequency band B1 and frequency band B2, B3, as exercisable first frequency band of antenna of the present invention; The frequency band of frequency f 2 and f3 correspondence then makes it that overlapping (being the frequency range that is denoted as B0 among Fig. 4) of part arranged.This overlapping frequency range B0 is linked to each other frequency band B2 and frequency band B3, allows frequency band B2 and frequency band B3 can synthesize the frequency band B4 of a frequency range wideer (wideer than frequency band B2, B3 other frequency range); And frequency band B4 also just becomes antenna 20 exercisable second frequency band of the present invention.By above discussion as can be known, antenna of the present invention not only can operate in double frequency-band, and the frequency range of frequency band also is able to effective increase; Especially at the higher frequency band of frequency.Narrated as the front, at the higher frequency band of frequency, the requirement of its frequency range is relatively strict (frequency range that is frequency band is than broad) also, makes the flat plane antenna of traditional technology be difficult to reach.In comparison, flat plane antenna of the present invention can increase the exercisable frequency range of HFS antenna in conjunction with two frequency bands of high frequency when design, solve the shortcoming of traditional flat plane antenna.

The different examples of antenna of the present invention below will be discussed.Please refer to Fig. 5 to Figure 10.Six figure of Fig. 5 to Figure 10 are respectively the vertical views of the first dull and stereotyped different embodiment of antenna 20 of the present invention.The embodiment of first flat board that these are different tells three different resonance ranges with slit area.The width that please notes slit is relevant with the coupling of the mutual electrical characteristic of each resonance range; Change the fine-tuning antenna characteristics of width (as the frequency range of frequency band, the impedance of antenna etc.) of slit.With first dull and stereotyped 22 similar among Fig. 3 E, first among Fig. 5 dull and stereotyped 42 is connected in contact jaw 46A with connector 26 (not being shown in Fig. 5), and is electrically connected on contact 48A with a contact of signal interface 28 (not being shown in Fig. 5).In three resonance ranges of first flat board 42, resonance range 45C presents crooked shape; The flow through length in path of electric current be can increase when this shape can make electric current flow into resonance range 45C along the shape of bending, the frequency of resonance range 45C correspondence and the frequency range of frequency band further changed.

Another embodiment 52 of first flat board has contact jaw 56A, contact 58A among Fig. 6.The resonance range 52C of first flat board 52 also is crooked shape, and the design of its design is then similar to first flat board 42 among Fig. 5.Crooked resonance range 52C can make electric current along the long path of resonance range pile warp, changes the frequency of resonance range 52C correspondence and the characteristic of frequency band.The resonance range of curved shape can change the length of current path in fixing area, adjustable parameter in the time of also increasing designing antenna helps the optimization of antenna performance.

According to identical reason, there is first flat board 62 of contact jaw 66A, contact 68A that crooked resonance range 62B is also arranged among Fig. 7.There are first dull and stereotyped 72 of contact jaw 76A, contact 78A crooked resonance range 72A is arranged among Fig. 8.Please note that this first flat board 72 is similar to first flat board 22 among Fig. 3 F, but the end points 120B of the second resonance range 23B among Fig. 3 F directly outwards opens a way (open), and the end points of the resonance range 72B of first flat board 72 is then to another resonance range 72A open circuit (sign of dotted line 79 in as Fig. 8) among Fig. 8.Change resonance range 72A and the mutual distance (width of promptly separating both slits) of 72B, also can adjust antenna characteristics.First flat board 82 that contact jaw 86A, contact 88A are arranged among Fig. 9, its crooked resonance range 82C then extends around the outside of resonance range 82B.First flat board 92 that contact jaw 96A, contact 98A are arranged among Figure 10, its resonance range 92B and resonance range 92C all present crooked shape, and resonance range 92C then extends around the outside of resonance range 92B part.

Please continue 11A with reference to figure.Figure 11 A is the external view of the antenna 100 of another embodiment of the present invention.The antenna 20 of similar first embodiment of the invention, antenna 100 have one first flat board 102, a ground connection flat board 104, a connector 106 and a signal interface 108.Connector 106 is connected with first dull and stereotyped 102 in contact jaw 106A, and the other end then is connected to ground connection flat board 104.One contact of signal interface 108 is received the contact 108A of first flat board 102, and the other end is then received ground connection flat board 104 as ground connection.Different with antenna 20 is that first flat board 102 of antenna 100 has the projection 103 and 105 of the conduction of two downward warpages.For further disclosing the configuration of projection 103 and 105, please continue with reference to figure 11B, Figure 11 C and Figure 11 D.Figure 11 B end view that to be antenna 100 look along (among Figure 11 A) arrow 11B direction; Figure 11 C end view that to be antenna 100 look along the direction of (among Figure 11 A) arrow 11C; Figure 11 D then is the stereogram of first dull and stereotyped 102 other directions.For asking illustrated clear, display signal interface 108 not in Figure 11 B, Figure 11 C.By among Figure 11 B and Figure 11 C as can be known, downwards the projection 103 and 105 of warpage can or not be connected with dull and stereotyped 104 contacts of ground connection.The purpose that increases projection 103 and 105 also is to increase the path that electric current is flowed through in the resonance range, with the frequency of change resonance range correspondence and the frequency range of frequency band.The projection that increases warpage can change the correlated frequency and the frequency band of corresponding resonance range under the situation that does not increase by the first dull and stereotyped 102 horizontal component projected areas, help to reduce antenna volume.

Please refer to Figure 12 A.Figure 12 A is the antenna 110 of another embodiment of the present invention.Antenna 110 has one first flat board 112, a ground connection flat board 114, a connector 116 and a signal interface 118.Connector 116 is connected with first dull and stereotyped 112 in contact jaw 116A, and the other end then is connected to ground connection flat board 114.One contact of signal interface 118 is received the contact 118A of first flat board 112, and the other end is then received ground connection flat board 114 as ground connection.Different with antenna 100 is, antenna 110 has the projection 113 of downward warpage, and is connected in projection 113, is the projection 115 of horizontal reflexed.The further configuration scenario of the projection of these two conductions can be with reference to figure 12B and Figure 12 C.Figure 12 B is the end view that antenna 110 is seen by the direction of arrow 12B among Figure 12 A; Figure 12 C then is the end view seen by the direction of arrow 12C among Figure 12 A of antenna 110 (two figure all not display signal interface 118).Can find out that by Figure 12 B and Figure 12 C projection 113 and 115 does not all contact with ground connection dull and stereotyped 114.Projection 113 and 115 purposes that are provided with, the order ground that is provided with last embodiment projection is identical, all is the path that will change resonance range electric current pile warp, to change the corresponding frequency and the frequency range of frequency band.

Compared to the phenomenon of the frequency band frequency range deficiency of traditional flat plane antenna, antenna of the present invention can operate in three frequency bands, and two frequency bands are united so that wideer frequency range to be provided, and solves the problem of traditional flat plane antenna.Below also disclosed various embodiments of the present invention, can provide multiple parameter to change, helped when the different purposes antenna of design optimization antenna performance.In addition, as the distance between connector and the first dull and stereotyped position (being the position of contact jaw) that is connected, first flat board and ground connection flat board (in other words, be exactly the length of connector), the position of the first dull and stereotyped upper contact (i.e. first dull and stereotyped and the signal interface be electrically connected part), but all change in the hope of the optimization of antenna performance of the present invention.Antenna of the present invention in addition between first dull and stereotyped and the ground connection flat board, except with air as the dielectric medium, also available other insulating material are filled in the space between first flat board and ground connection flat board as dielectric medium.

The above only is 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 the covering scope of patent of the present invention.

Claims

1. antenna comprises:

2. antenna as claimed in claim 1, wherein this first flat board is to tell this first, second and third resonance range with slit area.

3. antenna as claimed in claim 1, wherein this first resonance range is to be connected in this join domain with one first link, and the other end to the distance between this first link relative with this first link in this first resonance range is 1/4th of this first frequency corresponding wavelength.

4. antenna as claimed in claim 1, wherein this second resonance range is to be connected in this join domain with one second link, and the other end to the distance between this second link relative with this second link in this second resonance range is 1/4th of this second frequency corresponding wavelength.

5. antenna as claimed in claim 1, wherein the 3rd resonance range is to be connected in this join domain with one the 3rd link, and the other end to the distance between the 3rd link relative with the 3rd link in the 3rd resonance range is 1/4th of the 3rd a frequency corresponding wavelength.

6. antenna as claimed in claim 1, wherein the frequency distance between this second frequency and the 3rd frequency be less than this second frequency band and the 3rd frequency band frequency range and half.

7. antenna as claimed in claim 1, wherein the frequency distance between this first frequency and this second frequency is the frequency range greater than this first frequency band.

8. antenna as claimed in claim 1, wherein the frequency distance between this first frequency and the 3rd frequency is the frequency range greater than this first frequency band.

9. antenna as claimed in claim 1, wherein this first frequency at 800 megahertzes between the gigahertz.

10. antenna as claimed in claim 1, wherein this second frequency is between 1,600 megahertzes to, 1,799 megahertzes.

11. as the antenna of claim 10, wherein the 3rd frequency at 1,800 megahertzes between two gigahertzs.

12. as the antenna of claim 11, wherein this second frequency is in the centre of this second frequency band scope.

13. as the antenna of claim 11, wherein the 3rd frequency is in the centre of the 3rd frequency band scope.