CN107959111A - A kind of double frequency electricity small gap antenna - Google Patents
A kind of double frequency electricity small gap antenna Download PDFInfo
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- CN107959111A CN107959111A CN201711161770.4A CN201711161770A CN107959111A CN 107959111 A CN107959111 A CN 107959111A CN 201711161770 A CN201711161770 A CN 201711161770A CN 107959111 A CN107959111 A CN 107959111A
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- 230000005611 electricity Effects 0.000 title claims abstract description 21
- 230000005855 radiation Effects 0.000 claims abstract description 21
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052802 copper Inorganic materials 0.000 claims abstract description 16
- 239000010949 copper Substances 0.000 claims abstract description 16
- 238000005530 etching Methods 0.000 claims abstract description 3
- 239000002184 metal Substances 0.000 claims description 18
- 229910052751 metal Inorganic materials 0.000 claims description 18
- 230000008054 signal transmission Effects 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 4
- 150000002739 metals Chemical group 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000000191 radiation effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/10—Resonant antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/20—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements characterised by the operating wavebands
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a kind of double frequency electricity small gap antenna, including the attached copper dielectric-slab of single side and etching double frequency electronically small antenna on it;The double frequency electronically small antenna includes a coplanar waveguide feeder line, an impedance matching network and two gap radiation faces;Two gap radiation faces it is symmetrical be arranged on coplanar waveguide feeder line both sides, and be connected respectively by line of rabbet joint a with coplanar waveguide feeder line;The impedance matching network is serially connected in coplanar waveguide feeder line;The gap radiation face is made of symmetrical two " bow " the font line of rabbet joint of the extension on line of rabbet joint a.The double frequency electronically small antenna includes two resonant frequencies, and all frequency ranges of WLAN can be completely covered, and the working frequency and performance of antenna can be effectively adjusted by adjusting the different sizes to design a model.
Description
Technical field
The present invention relates to the small WLAN gaps of double frequency electricity of technical field of micro communication, more particularly to a kind of coplanar wave guide feedback
Antenna.
Background technology
As microwave technology develops rapidly in social work life, Wireless Application Device is also growing day by day, and antenna, makees
For part indispensable in microwave telecommunication system, also receive and grind the person of making internal disorder or usurp and more and more pay close attention to.Recently as research
Deepen continuously, radio-frequency front-end equipment also constantly develops towards directions such as miniaturization, densification, multifunctions, electronically small antenna conduct
The limit of antenna miniaturization and be subject to researcher more and more to favor.Therefore it is various to reduce antenna overall dimensions and protect antenna
The technology for holding superperformance is constantly suggested, such as fluting, bending and loading technique.To 21 century, indoor wireless networks by
Gradually to popularize, WLAN (Wireless LAN) electronically small antenna is also increasingly taken seriously, otherwise existing WLAN antennas size cannot
Meet the small requirement of electricity, otherwise all frequency ranges (2.4/5.2/5.8GHz) of WLAN cannot be covered at the same time.And according to " the Chu limit "
Theory, is provided simultaneously with electric small, high efficiency, directed radiation and covers the electric small of all frequency ranges of WLAN (2.4/5.2/5.8GHz) at the same time
The design of antenna is with abnormal arduous challenge.It can be seen from the above that its successful design has very in practical engineering application
Important research meaning and use value.
The content of the invention
It is an object of the invention to provide it is a kind of it is simple in structure, section is low, easy of integration and cheap based on coplanar ripple
Lead the double frequency WLAN electricity small gap antennas of feed.
To achieve the above object, the technical solution adopted by the present invention is specific as follows:
A kind of double frequency electricity small gap antenna, including the attached copper dielectric-slab of single side and etching double frequency electronically small antenna on it;
The double frequency electronically small antenna includes a coplanar waveguide feeder line, an impedance matching network and two gap radiation faces;Two
Gap radiation face it is symmetrical be arranged on coplanar waveguide feeder line both sides, and be connected respectively by line of rabbet joint a with coplanar waveguide feeder line;Institute
Impedance matching network is stated to be serially connected in coplanar waveguide feeder line;The gap radiation face is by the extension symmetrical two on line of rabbet joint a
A " bow " font line of rabbet joint is formed.
Preferably, the gap radiation face includes first line of rabbet joint, two second line of rabbet joint, two third slot lines, and two
The 4th line of rabbet joint of root, two the 5th line of rabbet joint, two the 6th line of rabbet joint and two the 7th line of rabbet joint;The middle part of first line of rabbet joint is connected with line of rabbet joint a,
The both ends of two second line of rabbet joint are connected to form the first U-shaped structure with the both ends of first line of rabbet joint and one end of third slot line respectively;The
The both ends of four line of rabbet joint are connected to form the second U-shaped structure with the other end of third slot line and one end of the 5th line of rabbet joint respectively;6th groove
The both ends of line are connected to form the 3rd U-shaped structure with the other end of the 4th line of rabbet joint and one end of the 7th line of rabbet joint;The end of 7th line of rabbet joint
Short circuit;First U-shaped structure, the second U-shaped structure and the 3rd U-shaped structure size it is identical and join end to end form two " bow " font grooves
Line.
Preferably, each corner in the first U-shaped structure, the second U-shaped structure and the 3rd U-shaped structure is right angle;
First line of rabbet joint length is L1, and the identical length of second line of rabbet joint, the 4th line of rabbet joint and the 6th line of rabbet joint is L2, between two the 4th line of rabbet joint
Distance be W3, third slot line, the 5th line of rabbet joint and the 7th line of rabbet joint are parallel and isometric, the length of 0.5* (L01-W3).
Preferably, the impedance matching network is by line of rabbet joint group and the co-planar waveguide group of two open-ends parallel with one another
Into.
Preferably, the line of rabbet joint group is made of two line of rabbet joint I and two line of rabbet joint II;One end of two line of rabbet joint I is together
Face waveguide feeder is connected, two gaps of co-planar waveguide and one end phase of the line of rabbet joint II of its other end with first terminal open circuit
Even, the other end of two line of rabbet joint II is connected with the two bars transmission gap of the co-planar waveguide of second terminal open circuit respectively.
Preferably, II length of the line of rabbet joint I and the line of rabbet joint is 0.306mm;The length of the co-planar waveguide of first terminal open circuit
Spend for 1.9mm, its length for opening a way section is 0.918mm;The length of the co-planar waveguide of second terminal open circuit is 1.45mm, it is opened a way
The length of the section line of rabbet joint is 0.306mm.
Preferably, the coplanar waveguide feeder line is by two bars transmission gap, intermetallic metal conduction band and two metals
Ground forms;Two bars are with transmitting gap and metal symmetrical on intermetallic metal conduction band, and impedance matching network is serially connected in middle gold
Belong on conduction band.
Preferably, the width in the signal transmission gap is 0.15mm, and the width of the intermetallic metal conduction band is
2.13mm。
Preferably, the plate of the attached copper dielectric-slab of the single side is individual layer Rogers R4003C, its relative dielectric constant is
3.38, thickness 0.8mm, copper thickness are 0.18mm.
Relative to the prior art, double frequency WLAN electricity small gap antenna of the present invention has the following advantages that:
Electronically small antenna compact dimensions, simple in structure, section is low, easy to process, it is cheap and be easy to and other microwaves electricity
Road integrates.The double frequency electronically small antenna includes two resonant frequencies, and all frequency ranges of WLAN can be completely covered, different by adjusting
The size to design a model can effectively adjust the working frequency and performance of antenna.
Brief description of the drawings:
Fig. 1 is the planar structure and scale diagrams of the double frequency electronically small antenna of the present invention;
Fig. 2 is the structure diagram in the gap radiation face of single terminal short circuit of the present invention;
Fig. 3 is the schematic diagram of the impedance matching network of double frequency electronically small antenna loading of the present invention;
Fig. 4 is the reflectance factor schematic diagram of double frequency electricity small gap antenna of the present invention;
Fig. 5 a are E-plane and H-plane patterns under 2.4GHz (a) of the present invention;
Fig. 5 b are E-plane and H-plane patterns under 5.5GHz (b) of the present invention;
Fig. 6 is the schematic equivalent circuit of double frequency electronically small antenna of the present invention.
Embodiment:
It is right below in conjunction with the accompanying drawings for the present invention is further explained to reach the technological means and effect that above-mentioned purpose is taken
The embodiment of the present invention is described in detail.
As shown in Figure 1, a kind of double frequency electricity small gap antenna, including 2, impedance matching networks of a coplanar waveguide feeder line
3rd, two gap radiation faces 1 and two identical line of rabbet joint a4;Coplanar waveguide feeder line 2 is by two bars transmission gap 21, centre
Form metal conduction band 22 and two metals;Two bars are with transmitting gap 21 and metal right on intermetallic metal conduction band 22
Claim, impedance matching network 3 is serially connected on intermetallic metal conduction band 22;Two gap radiation faces 1 it is symmetrical be arranged on co-planar waveguide
2 both sides of feeder line, single gap radiation face 1 is symmetrical on the extended line of line of rabbet joint a4, and one end of two line of rabbet joint a4 and co-planar waveguide
The signal transmission gap 21 of feeder line 2 is connected, and the other end is connected with two gap radiation faces 1 respectively, and the series connection of impedance matching network 3 adds
It is loaded on the intermetallic metal conduction band 22 of coplanar waveguide feeder line 2, a double frequency WLAN electronically small antenna can be achieved in above-mentioned design.
Double frequency electronically small antenna is etched on the attached copper dielectric-slab of single side being made of metallic copper 102 and dielectric-slab 101, metallic copper
102 above dielectric-slab 101, and point-like fill part is metallic copper 102 in figure.The plate of the attached copper dielectric-slab of single side is individual layer
Rogers R4003C, its relative dielectric constant are 3.38, and thickness 0.8mm, copper thickness is 0.18mm, to meet 50 ohmages
Match somebody with somebody, the width of the intermetallic metal conduction band 22 of coplanar waveguide feeder line 2 is W1=2.13mm.The width in signal transmission gap 21 is g1=
0.15mm。
As shown in Fig. 2, Fig. 2 is the knot in the gap radiation face 1 of the single terminal short circuit of double frequency WLAN electronically small antennas of the present invention
Structure schematic diagram.
Gap radiation face 1 includes first line of rabbet joint 11, two second line of rabbet joint 12, two third slot lines 13, two the 4th
The line of rabbet joint 14, two the 5th line of rabbet joint, 15 two the 6th line of rabbet joint 16 and two the 7th line of rabbet joint 17;The middle part of first line of rabbet joint 11 and line of rabbet joint a4
It is connected, the both ends of two second line of rabbet joint 12 are connected to form first with the both ends of first line of rabbet joint 11 and one end of third slot line 13 respectively
U-shaped structure;The both ends of 4th line of rabbet joint 14 are connected to form with the other end of third slot line 13 and one end of the 5th line of rabbet joint 15 respectively
Two U-shaped structures;The both ends of 6th line of rabbet joint 16 and one end of the other end of the 4th line of rabbet joint 14 and the 7th line of rabbet joint 17 are connected to form the 3rd U
Type structure;The end short circuit of 7th line of rabbet joint 17;First U-shaped structure, the second U-shaped structure and the 3rd U-shaped structure size are identical and first
Tail, which is connected, forms two " bow " font line of rabbet joint.
The structure and the structure of the two " bow " fonts that especially single gap radiation face 1 includes two " bow " font are closed
It is symmetrical in the extended line of line of rabbet joint a4;Extended line pair of two " bow " font structures in another gap radiation face on line of rabbet joint a4
Claim, whole antenna includes the structure of four " bow " fonts.
In the present embodiment, each corner in the first U-shaped structure, the second U-shaped structure and the 3rd U-shaped structure is straight
Angle;First line of rabbet joint, 11 length is L1, and the identical length of second line of rabbet joint 12, the 4th line of rabbet joint 14 and the 6th line of rabbet joint 16 is L2, two
The distance between 4th line of rabbet joint 14 is W3, and third slot line 13, the 5th line of rabbet joint 15 and the 7th line of rabbet joint 17 are parallel and isometric, the length of
0.5*(L01-W3);The above-mentioned line of rabbet joint is the hollow out gap opened up on the attached copper dielectric-slab 100 of single side.
As shown in figure 3, Fig. 3 is the structure diagram of the impedance matching network 3 of double frequency electronically small antenna of the present invention.Impedance matching
Network 3 be loaded in series on the intermetallic metal conduction band 22 of coplanar waveguide feeder line 2, as shown in Figure 1;Specifically by two line of rabbet joint I 31,
The co-planar waveguide 34 of two line of rabbet joint II 32, the co-planar waveguide 33 of first terminal open circuit and second terminal open circuit forms;Two line of rabbet joint I
31 one end is connected with coplanar waveguide feeder line 2, two gaps of its other end with the co-planar waveguide 33 of first terminal open circuit
It is connected with one end of the line of rabbet joint II 32, the other ends of two line of rabbet joint II 32, two with the co-planar waveguide 34 of second terminal open circuit respectively
Signal transmission gap is connected.
The line of rabbet joint I 31 and II 32 length of the line of rabbet joint are 0.306mm;The length of co-planar waveguide 33 of first terminal open circuit is
1.9mm, its length for opening a way section is 0.918mm;The length of the co-planar waveguide 34 of second terminal open circuit is 1.45mm, its section of opening a way
The length of the line of rabbet joint is 0.306mm.
With reference to shown in figure, the preferable size of double frequency slit antenna of the present invention is as shown in Table 1:
Table one:The size mm of double frequency electronically small antenna preferred embodiment of the present invention
W | 12.95 | W2 | 0.45 | L1 | 6.35 | L5 | 0.36 |
L | 13.3 | g2 | 0.15 | L2 | 1.35 | L0 | 6 |
W1 | 2.13 | W3 | 0.2 | L3 | 1.9 | a | 0.9 |
g1 | 0.15 | g3 | 0.15 | L4 | 1.45 | b | 0.95 |
In the present embodiment, the length L of the attached copper dielectric-slab of single side is preferably 13.3mm, and width W is preferably 12.95mm.It is single
The length and width of the attached copper dielectric-slab in face can change with the change of antenna sections size.
As shown in figure 4, Fig. 4 is the schematic diagram of the reflectance factor of double frequency WLAN electronically small antennas of the present invention.As can be seen that electricity is small
Antenna has two working frequency range, its centre frequency is respectively 2.4 and 5.5GHz, and relative bandwidth is respectively 8% and 14.5%, can be very
The 5.5GHz of the 2.4/5.2/5.8GHz and WIMAX (global interconnection microwave) of good covering WLAN.Two frequency ranges of Antenna Operation
By two " bow " font terminal short circuit radiating surface and impedance matching network produce.E faces and H faces under its 2.4GHz and 5.5GHz
Directional diagram as shown in figure 5 a and 5b, it can be seen that the main polarization directional diagram in E faces is in " 8 " type, has certain directionality, H faces
It is in omnidirectional radiation state when 0-180 is spent.
Refering to what is shown in Fig. 6, Fig. 6 is the equivalent circuit diagram of double frequency electronically small antenna proposed by the present invention, the capacitance connected in figure
C0 is that impedance matching network produces, and the capacitance C01 and second terminal that the co-planar waveguide 33 that C0 is opened a way by first terminal produces are opened
The capacitance C02 that the co-planar waveguide 34 on road produces is in parallel and obtains, which can effectively offset antenna caused by drastically size reduces
Input impedance imaginary part increase, so as to improve the overall performance of antenna, include the impedance matching of antenna and feeder line, reduce anti-
Penetrate, widening frequency band, improve efficiency and gain etc.;In figureIt is the input impedance of antenna, ZLIt is the matching impedance that feeder line is connected
Or other microwave circuits, its resistance value are 50 ohm.
Not only design structure is compact, easy to process, cheap, section is low, is easy to it for the double frequency electronically small antenna of the present invention
He integrates microwave circuit, and realizes the electric small planar antennas that can cover all frequency ranges of WLAN using loading technique, has good
Radiation effect, it is expected to be promoted use.
It the above is only the preferred embodiment of the present invention, it should be pointed out that:Come for those skilled in the art
Say, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should be regarded as
Protection scope of the present invention.
Claims (9)
- A kind of 1. double frequency electricity small gap antenna, it is characterised in that:Including the double frequency attached copper dielectric-slab of single side and etching on it Electronically small antenna;The double frequency electronically small antenna includes a coplanar waveguide feeder line(2), an impedance matching network(3)And two gap spokes Penetrate face(1);Two gap radiation faces(1)Symmetrical is arranged on coplanar waveguide feeder line(2)Both sides, and pass through line of rabbet joint a respectively(4)Together Face waveguide feeder(2)It is connected;The impedance matching network(3)It is serially connected in coplanar waveguide feeder line(2)In;The gap radiation face(1)By on line of rabbet joint a(4)Symmetrical two " bow " fonts line of rabbet joint of extension form.
- A kind of 2. double frequency electricity small gap antenna according to claim 1, it is characterised in that:The gap radiation face(1)Bag Include first line of rabbet joint(11), two second line of rabbet joint(12), two third slot lines(13), two the 4th line of rabbet joint(14), two Five line of rabbet joint(15)Two the 6th line of rabbet joint(16)And two the 7th line of rabbet joint(17);First line of rabbet joint(11)Middle part and line of rabbet joint a(4)It is connected, two second line of rabbet joint(12)Both ends respectively with first line of rabbet joint(11) Both ends and third slot line(13)One end be connected to form the first U-shaped structure;4th line of rabbet joint(14)Both ends respectively with third slot line(13)The other end and the 5th line of rabbet joint(15)One end be connected to form Second U-shaped structure;6th line of rabbet joint(16)Both ends and the 4th line of rabbet joint(14)The other end and the 7th line of rabbet joint(17)One end be connected to form the 3rd U Type structure;7th line of rabbet joint(17)End short circuit;First U-shaped structure, the second U-shaped structure and the 3rd U-shaped structure size it is identical and join end to end form two " bow " font grooves Line.
- A kind of 3. double frequency electricity small gap antenna according to claim 3, it is characterised in that:It is first U-shaped structure, second U-shaped Each corner in structure and the 3rd U-shaped structure is right angle;First line of rabbet joint(11)Length is L1, second line of rabbet joint(12), the 4th line of rabbet joint(14)And the 6th line of rabbet joint(16)Length it is identical For L2, two the 4th line of rabbet joint(14)The distance between be W3, third slot line(13), the 5th line of rabbet joint(15)And the 7th line of rabbet joint(17)It is flat It is capable and isometric, the length of 0.5* (L01-W3).
- A kind of 4. double frequency electricity small gap antenna according to claim 1, it is characterised in that:The impedance matching network(3) It is made of the co-planar waveguide of line of rabbet joint group and two open-ends parallel with one another.
- A kind of 5. double frequency electricity small gap antenna according to claim 4, it is characterised in that:The line of rabbet joint group is by two line of rabbet joint Ⅰ(31)With two line of rabbet joint II(32)Composition;Two line of rabbet joint I(31)One end and coplanar waveguide feeder line(2)It is connected, its other end is coplanar with first terminal open circuit Waveguide(33)Two gaps and the line of rabbet joint II(32)One end be connected, two line of rabbet joint II(32)The other end respectively with second terminal The co-planar waveguide of open circuit(34)Two bars transmission gap be connected.
- A kind of 6. double frequency electricity small gap antenna according to claim 5, it is characterised in that:The line of rabbet joint I(31)And the line of rabbet joint Ⅱ(32)Length is 0.306mm;The co-planar waveguide of first terminal open circuit(33)Length be 1.9mm, its open a way section length be 0.918mm;The co-planar waveguide of second terminal open circuit(34)Length be 1.45 mm, its open a way the section line of rabbet joint length be 0.306mm.
- A kind of 7. double frequency electricity small gap antenna according to claim 1, it is characterised in that:The coplanar waveguide feeder line(2) Gap is transmitted by two bars(21), intermetallic metal conduction band(22)And two metals form;Two bars transmit gap(21)On intermetallic metal conduction band with metal(22)Symmetrically, impedance matching network(3)Concatenation In intermetallic metal conduction band(22)On.
- A kind of 8. double frequency electricity small gap antenna according to claim 8, it is characterised in that:The signal transmission gap(21) Width be 0.15mm, the intermetallic metal conduction band(22)Width be 2.13mm.
- A kind of 9. double frequency electricity small gap antenna according to claim 1, it is characterised in that:The attached copper dielectric-slab of single side Plate is individual layer Rogers R4003C, its relative dielectric constant is 3.38, and thickness 0.8mm, copper thickness is 0.18mm.
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CN201711161770.4A CN107959111B (en) | 2017-11-20 | 2017-11-20 | Dual-frequency electric small slot antenna |
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CN201711161770.4A CN107959111B (en) | 2017-11-20 | 2017-11-20 | Dual-frequency electric small slot antenna |
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Cited By (1)
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CN110676554A (en) * | 2019-08-02 | 2020-01-10 | 杭州法动科技有限公司 | Low-profile ultra-wideband indoor communication plane structure antenna |
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