CN101320836B

CN101320836B - Broadband inversed F type antenna

Info

Publication number: CN101320836B
Application number: CN2007101089050A
Authority: CN
Inventors: 陈柏全
Original assignee: Alpha Networks Inc
Current assignee: Alpha Networks Inc
Priority date: 2007-06-04
Filing date: 2007-06-04
Publication date: 2012-05-30
Anticipated expiration: 2027-06-04
Also published as: CN101320836A

Abstract

This invention provides a broadband reverse F type antenna, including an antenna body installed at a circuit board, a short line and a feed-in line; wherein the antenna body is composed of a first part, a second part and a third part; the line width of the first part is shorter than that of the third part; and the second part is installed between the first and third parts, and the line width of the second part is gradually increased from one end to the other end; and the short line is installed at the position between the first part and one grounding surface set by the circuit board and adjacent to one end of the first end and; the feed-in line is installed at the position between the first part and the grounding surface and adjacent to the other end of the first part. Therefore, the effective bandwidth of the broadband reverse F type antenna is easy to be adjusted to cover the needed broadband of the product using the broadband reverse F type antenna because of no any metal between the antenna body and the grounding surface, and the tolerance is effectively increased when mass-production is carried out.

Description

Broadband inversed F type antenna

Technical field

The present invention is relevant for inverted F shaped antenna, refers to a kind of efficient extn frequency range especially, is easy to adjust to the broadband inversed F type antenna of needed frequency band, the tolerance when effectively increasing volume production.

Background technology

Network equipment manufacturing person adds day function of line options (AntennaDiversity) in wireless network access point (Wireless Access Point) or wireless router Wireless Communication Equipment such as (Wireless Router) at present; Can have optimum signal transmitting-receiving quality in the hope of Wireless Communication Equipment, finally reach the purpose that the dead angle is contained and do not had to signal entirely.Therefore, Wireless Communication Equipment is except the antenna that exposes to its casing at present, and the inside of this casing also is provided with another antenna.This another antenna is chip-shaped antenna (Chip Antenna), printed circuit one pole (Monopole) antenna and inverted F shaped antenna etc. mostly.

Wireless Communication Equipment develops towards miniaturization now; Make network equipment manufacturing person when the design Wireless Communication Equipment; The space that the inner circuit board of this Wireless Communication Equipment can supply this another antenna is set becomes more and more little, in addition, and the demand of inner various parts of this Wireless Communication Equipment and mechanism design; More cause this another Antenna Design space to be subjected to more restriction, cause this another antenna and fail to reach really the purpose that optimum signal is received and dispatched quality.Below specify respectively, this another antenna can't reach the reason of the purpose of optimum signal transmitting-receiving quality:

1, chip-shaped antenna (Chip Antenna) 10:

See also shown in Figure 1, normally by a kind of being referred to as " LTCC (Low TemperatureCo-fired Ceramic; LTCC) " technological manufacturing, main characteristic of this technology is that volume is minimum, therefore; in the limited inner space of Wireless Communication Equipment, the putting position of chip-shaped antenna 10 obviously has very big elasticity, but chip-shaped antenna 10 is in practical application; because inner mechanism and circuit board 2 coefficients of Wireless Communication Equipment are different; often can't put according to the optimum that the product data sheet (Productdata sheet) of chip-shaped antenna 10 is advised, thus in the frequency range performance, dislike not enough slightly, and radiation efficiency is unsatisfactory; and use chip-shaped antenna to need extra cost, can't reach demand cheaply.

2, the printed circuit unipole antenna 12:

See also shown in Figure 2; Printed circuit unipole antenna 12 is printed on the circuit board 2 with a microstrip line; The part of this microstrip line is as a feed-in line 122, and this feed-in line 122 ground plane 20 of crossing this circuit board 2 holding wire 120 that forms that stretches out out.The advantage of this printed circuit unipole antenna 12 be the simple and design of framework easily, as long as can reach the demand of impedance matching, can form arbitrary shape with the existing arrangement space of coincident circuit plate 2.The shape of the printed circuit unipole antenna 12 of various Wireless Communication Equipment; According to different designs person's custom and mechanism and circuit board 2 coefficients difference, often have very big difference, and the frequency range performance is unsatisfactory; Therefore, for causing very big puzzlement in antenna manufacturing and the design.

3, inverted F shaped antenna 14:

See also shown in Figure 3; These inverted F shaped antenna 14 seals are located on the circuit board 2; This circuit board 2 is provided with a ground plane 20 near its marginal position, and this inverted F shaped antenna 14 is made up of a feed-in line 140, a short-

circuit line

142 and 144 of antenna bodies, and wherein this feed-in line 140 joins with an end and this ground plane 20 of short-circuit line 142; End then extends towards the edge of this circuit board 2 in addition; And an end of this antenna body 144 and this short-circuit line 142 join, and in addition end extends to along the edge of this circuit board 2 and after end joins in addition of this feed-in line 140, continues to extend one section predetermined length along the edge of this circuit board 2.Know by aforementioned; Inverted F shaped antenna 14 is distortion of printed circuit unipole antenna 12; Compare with printed circuit unipole antenna 12 and inverted F shaped antenna 14, because the special shape of inverted F shaped antenna 14, it is littler than printed circuit unipole antenna 12 to make that inverted F shaped antenna 14 takies the area of circuit board 2 again.See also shown in Figure 4ly, the width of this feed-in line and short-circuit line all is that 0.85mm, length are all 5mm, and spacing to each other is 2.3mm; The width 0.7mm of this antenna body 144, length are 18.63mm; See also shown in Figure 5, after measuring through circuit design verification, at the frequency range that returns between loss-10dB; Be between 2.338～2.508GHz, the problem that these inverted F shaped antenna 14 ubiquity frequency ranges are not enough.

According to the above, the shortcoming that above

antenna

10,12,14 is common, it is undesirable to be all the frequency range performance, makes that coupling error vector amplitude (Couple error vector magnitude (EVM)) is not good, and then influences transmission rate (Throughput).And, therefore, be necessary to develop antenna in the market in fact with broadband, miniaturization and simple shape because the trend of Wireless Communication Equipment miniaturization adds the demand in the mechanism, and the position that antenna is put often is limited.

Summary of the invention

Because aforesaid many disappearances, the inventor is through the permanent research and experiment of making great efforts, and development and Design goes out a kind of broadband inversed F type antenna of the present invention finally, in the hope of through proposition of the present invention, can contribute to some extent society.

A purpose of the present invention provides a kind of broadband inversed F type antenna; Be located at by seal that a antenna body, a short-circuit line and a feed-in line on the circuit board formed, wherein keep certain spacing between this antenna body and this ground plane, and comprise a first, a second portion and a third part; And this first is positioned at the position of adjacent this first's one end in the face of a side of this ground plane; A ground plane set to this circuit board extends to form this short-circuit line, and this first is positioned at the position of holding in addition near this first in the face of a side of this ground plane, extends to this ground plane; Use and form this feed-in line; And the live width of this first is littler than the width of the live width of third part, and the live width of this second portion is held gradually in addition to it gradually by the one of which end and enlarged; And an end of this second portion and this first in addition end be connected together mutually, and the end in addition of this second portion is connected together with this third part one end mutually.

So, between this second and third part and this ground plane, owing to there is not any metal, make effective frequency range of this broadband inversed F type antenna, be easy to adjust to and contain the required frequency band of the product that uses this broadband inversed F type antenna, the tolerance when effectively increasing volume production.For convenient your auditor can do further understanding and understanding to the object of the invention, technical characterictic and effect thereof, lift embodiment now and cooperate graphicly, specify as follows:

Description of drawings

Fig. 1 is the sketch map of the chip-shaped antenna of prior art;

Fig. 2 is the sketch map of prior art printed circuit unipole antenna;

Fig. 3 is the sketch map of prior art inverted F shaped antenna;

Fig. 4 is the actual size sketch map of prior art inverted F shaped antenna;

Fig. 5 is that the frequency range of Fig. 4 measures sketch map;

Fig. 6 is a configuration diagram of the present invention;

Fig. 7 is the sketch map of one embodiment of first of the present invention;

Fig. 8 is the sketch map of another embodiment of first of the present invention;

Fig. 9 is the sketch map of third part one embodiment of the present invention;

Figure 10 is the sketch map of second portion one embodiment of the present invention;

Figure 11 is the size indication figure of Fig. 6; And

Figure 12 is that the frequency range of Figure 10 measures sketch map.

The main element symbol description:

Circuit board ... 3 antenna bodies ... 40

Short-circuit line ... 42 feed-in lines ... 44

First ... 400 second portions ... 402

Third part ... 404 ground planes ... 30

Embodiment

The present invention is a kind of broadband inversed F type antenna; See also shown in Figure 6; One circuit board 3 is provided with a ground plane 30 in the position near the one of which lateral edges; This broadband inversed F type antenna then is provided in a side of 30 of a lateral edges and this ground planes of this circuit board 3; And this broadband inversed F type antenna comprises an antenna body 40, a short-circuit line 42 and a feed-in line 44; Wherein this antenna body 40 is made up of a first 400, a second portion 402 and a third part 404, and wherein the live width of this first 400 is littler than the width of the live width of third part 404, and an end of this first 400 is to it in addition between end; Be that maintenance identical live width and uniform distances are formed along these ground plane 30 definite length extended; The end in addition of one end of this second portion 402 and this first 400 joins, and an end line of this second portion 402 is wide suitable with live width this first 400, and towards expanding gradually away from the direction of this first 400 and extending; Up to its in addition live width and this third part 404 of end live width quite till, an end of this third part 404 is held to keep live width and uniform distances identical between these third part 404 two ends formed along these ground plane 30 definite length extended by this two part 402 in addition.And; This first 400 is positioned at the position of adjacent these first's 400 1 ends in the face of a side of this ground plane 30; Extend to this ground plane 30, use forming this short-circuit line 42, this first 400 is positioned at the position of holding in addition near this first 400 in the face of a side of this ground plane 30; Extend and be connected to the set signal transmitting and receiving loop 46 of this circuit board 3 to this ground plane 30, use forming this feed-in line 44.So; There are not any metal in 30 of this antenna body 40 and this ground planes; And effective frequency range of this broadband inversed F type antenna is not increasing under the extra match circuit (Matching Circuit); Can be easy to adjust to the needed frequency band of product, the mechanism shell design of tolerance when effectively increasing volume production and suitable different product.

In the present invention; See also shown in Figure 6; This first 400 and third part 404 can be the rectangular microstrip metal wire; And; This first 400 extends back to a side of this ground plane 30 and is connected the side of this third part 404 back to this ground plane 30, this first 400 in the face of a side of this ground plane 30 towards extending near ground plane 30 and being connected the side of this third part 404 in the face of this ground plane 30, use between this first and second portion, to form and be this trapezoidal second portion 402.And this first 400 can not influence under the whole frequency range of this antenna body, and a corner cut (shown in the 7th figure) or an arc (shown in the 8th figure) are processed by this first 400 back to the position in a corner of this short-circuit line 42.Moreover this third part 404 can not influence under the whole frequency range of this antenna body, and this third part 404 is processed an arc (shown in the 9th figure) away from an end of this second portion.

Because the shape of first 400 of the present invention and third part 404 is not confined to aforesaid rectangle, second portion 402 is not confined to aforesaid trapezoidal yet, and; The live width of these second portion 402 1 ends and the live width of this first 400 can be unsuitable; And this second portion 402 live width of live width and this third part 400 of end can be unsuitable yet in addition, therefore, the live width of every third part 404 is bigger than the live width of first 400; And this second portion 402 is towards the shape of expanding gradually and extending away from the direction of this first 400; All belong to can think easily and variation or modification, all can be encompassed in the claim scope of the present invention, for example: see also shown in Figure 10; The both sides of this first 400 expand outwardly definite length extended gradually with one first angle; Expand outwardly definite length extended gradually with second angle again, and be connected the both sides of this third part, use between this first and third part to form and be this bell second portion 402.

In addition; This antenna body 40, short-circuit line 42 and feed-in line 44 can be a little band metal wire; Add its simple shape, make this antenna body 40, short-circuit line 42 and feed-in line 44 in the technology of printed circuit board (PCB), to make easily, so; This broadband inversed F type antenna more is prone to import volume production, and then improves the production stability.In addition; The spacing that live width through revising this antenna body 40, short-circuit line 42 and feed-in line 44, length, short-circuit line 42 and feed-in line are 44; And this feed-in line 44 is used the frequency of finely tuning this broadband inversed F type antenna being connected the conditions such as position of this first 400 in the face of these ground plane 30 1 sides.

Figure 11 is according to antenna structure shown in Figure 6, and with the size indication figure of this antenna body 40, short-circuit line 42 and feed-in line 44 direct printed wiring board using thems, wherein the width of this first 400, short-circuit line 42 and feed-in line 44 is all 0.5mm; The total length of this short-circuit line 42 and feed-in line 44 is all 7.6mm; The spacing that this short-circuit line 42 and feed-in line are 44 is 3.6mm, and the length of this first 400 is 4.8mm, the width 3.0mm of this third part 404, length 7.1mm; And this short-circuit line 42 is orthogonal thereto each other with this first 400; And this feed-in line 44 is orthogonal thereto each other with this first 400, and simultaneously, this feed-in line 44 is parallel to each other with short-circuit line 42.So, see also shown in Figure 12ly, the frequency range that this broadband inversed F type antenna measures has been contained about 2128MHz～2830MHz, and about 702MHz, measurement show except frequency range increases, the performance of antenna gain also than traditional inverted F shaped antenna come good.

In the present invention, in order to compensate the inductive of this feed-in line 44, and electric current is uniformly distributed between this antenna body 40; Utilize this second portion 402 to accomplish the coupling framework, reduce the inductive effect of its feed-in, and make the CURRENT DISTRIBUTION trend evenly; And make antenna bandwidth contain bigger scope, simultaneously, structurally the design through this short-circuit line 42 forms inductance; Solve power down by this and hold problem, be returned to the purpose that quarter-wave is reached resonance and radiation, as expectedly reaching the effect that increases frequency range; Therefore; The present invention does not promptly increase extra match circuit (MatchingCircuit) under the prerequisite that does not change the script board structure of circuit, increase the frequency range of antenna.

The above is merely the best specific embodiment of the present invention, however characteristic of the present invention be not limited thereto, anyly be familiar with this art in field of the present invention, can think easily and variation or modification, all can be covered by claim scope of the present invention.

Claims

1. broadband inversed F type antenna; Be located on the circuit board, said circuit board is provided with a ground plane in the position near the one of which lateral edges, and said broadband inversed F type antenna then is provided in a side of between a lateral edges and said ground plane of said circuit board; It is characterized in that said broadband inversed F type antenna comprises:

One antenna body; Form by a first, a second portion and a third part; The live width of wherein said first is littler than the width of the live width of third part; Said second portion is located between said first and third part; And the live width of said second portion by the one of which end gradually to its in addition end enlarge gradually, and an end of said second portion joins in the face of an end of said third part with said first, and the end that the end in addition of said second portion and said third part are faced said first joins;

One short-circuit line is located at said first in the face of between a side and this ground plane of said ground plane, and said short-circuit line one end connects said first on the position of said second portion one end, holds in addition then to extend to this ground plane; And

One feed-in line; Be located at said first in the face of between a side and this ground plane of said ground plane; One end of said feed-in line is connected said first near on the end of said second portion, and end then extends to the set signal transmitting and receiving loop of said circuit board to this ground plane in addition.

2. broadband inversed F type antenna according to claim 1 is characterized in that, said first and third part are the rectangular microstrip metal wire.

3. broadband inversed F type antenna according to claim 2; It is characterized in that; Said first is connected the side of said third part back to said ground plane back to the side extension of said ground plane; Said first is trapezoidal said second portion in the face of a side of said ground plane towards extending near ground plane and be connected the side of said third part in the face of said ground plane, use between said first and third part, to form.

4. broadband inversed F type antenna according to claim 3 is characterized in that, a corner cut is processed back to the position in a corner of said short-circuit line by said first.

5. broadband inversed F type antenna according to claim 3 is characterized in that, an arc is processed back to the position in a corner of said short-circuit line by said first.

6. broadband inversed F type antenna according to claim 3 is characterized in that, said third part is processed an arc away from an end of said second portion.

7. broadband inversed F type antenna according to claim 3 is characterized in that, said short-circuit line and said first are orthogonal thereto each other.

8. broadband inversed F type antenna according to claim 3 is characterized in that, said feed-in line and said first are orthogonal thereto each other, and simultaneously, said feed-in line and short-circuit line are parallel to each other.

9. broadband inversed F type antenna according to claim 3 is characterized in that, an end line of said second portion live width wide and said first is suitable.

10. broadband inversed F type antenna according to claim 3 is characterized in that, other end line live width wide and said third part of said second portion is suitable.

11. broadband inversed F type antenna according to claim 2; It is characterized in that; The both sides of said first expand outwardly definite length extended gradually with one first angle; Expand outwardly definite length extended gradually with second angle again, and be connected the both sides of said third part, use between said first and third part to form and be bell said second portion.