CN106299613B - Antenna system - Google Patents
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- CN106299613B CN106299613B CN201510256067.6A CN201510256067A CN106299613B CN 106299613 B CN106299613 B CN 106299613B CN 201510256067 A CN201510256067 A CN 201510256067A CN 106299613 B CN106299613 B CN 106299613B
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Abstract
A kind of antenna system.The antenna system includes: one first dipole antenna component and one second dipole antenna component；The first dipole antenna component includes one first feed-in irradiation unit and one first ground connection irradiation unit, and wherein the first feed-in irradiation unit has a protrusion, which has an open slot, and the protrusion extends within the open slot；The second dipole antenna component includes one second feed-in irradiation unit and one second ground connection irradiation unit；Wherein the first dipole antenna component and the second dipole antenna component are all excited by a signal source.The first dipole antenna component operates in a low-frequency band, and the second dipole antenna component operates in a high frequency band.Antenna system of the invention has the characteristics such as interference and low coaxial cable beta radiation between high-gain, low insertion loss, few frequency band, and structure is simple, is easy to implement to operate in various communication device, can enjoy the commercial value of large production.
Description
Technical field
The present invention relates to a kind of antenna system, in particular to a kind of antenna system of high-gain (High Gain).
Background technique
With the prosperity of mobile communication technology, mobile device is more prevalent in recent years, it is common for example: portable calculating
Machine, mobile phone, multimedia player and other mixed functions portable electronic apparatus.In order to meet the needs of people,
Mobile device usually has the function of wireless communication.Some cover the range for wireless communication of long range, such as: mobile phone uses
2G, 3G, LTE (Long Term Evolution) system and its used 700MHz, 850MHz, 900MHz, 1800MHz,
The frequency band of 1900MHz, 2100MHz, 2300MHz and 2500MHz are communicated, and some then cover short-range channel radio
Believe range, such as: Wi-Fi, Bluetooth system are communicated using the frequency band of 2.4GHz, 5.2GHz and 5.8GHz.
Antenna is indispensable component in wireless communication field.If for receiving or emitting its gain of the antenna of signal
(Gain) insufficient, then easily cause the communication quality of mobile device to decline.Therefore, the antenna sets of high-gain how to be designed
Part is an important topic for antenna designers.
Accordingly, it is desirable to provide a kind of antenna system solves the above problems.
Summary of the invention
The present invention provides a kind of antenna system, which includes: one first dipole antenna component, first dipole antenna
Line component includes one first feed-in irradiation unit and one first ground connection irradiation unit, and wherein the first feed-in irradiation unit has a protruding portion
Point, which has an open slot, and the protrusion extends within the open slot；And one
Two dipole antenna components, the second dipole antenna component include one second feed-in irradiation unit and one second ground connection irradiation unit；Wherein
The first dipole antenna component and the second dipole antenna component are all excited by a signal source, the first dipole antenna component behaviour
Make in a low-frequency band, and the second dipole antenna component operates in a high frequency band.
In some embodiments, the first feed-in irradiation unit, the first ground connection irradiation unit, the second feed-in irradiation unit, with
And the second ground connection irradiation unit is each substantially a rectangle.
In some embodiments, the relatively narrow vertical bar shaped of the protrusion substantially one, and the open slot substantially one is wider
Vertical bar shaped.
In some embodiments, the length of the open slot be less than the low-frequency band a center frequency of operation eight/
One wavelength.
In some embodiments, the gap at the edge of the protrusion and the open slot is less than 1mm.
In some embodiments, the protrusion and the open slot be used to prevent the high frequency band current interference this
One dipole antenna component.
In some embodiments, the 1 of one first load point of the first feed-in irradiation unit and the second feed-in irradiation unit the
Two load points are all coupled to the anode of the signal source, and one first grounding point of the first ground connection irradiation unit and the second ground connection spoke
One second grounding point for penetrating portion is all coupled to the cathode of the signal source.
In some embodiments, first load point is adjacent to the protrusion, and first grounding point is opened adjacent to this
Mouth slot.
In some embodiments, antenna system further include: one first sinuous connecting line；And one first concatenation radiation
Portion is coupled to the first feed-in irradiation unit via the first sinuous connecting line.
In some embodiments, which is located at a first edge of the first feed-in irradiation unit, this first wriggle
Connecting line is coupled to a second edge of the first feed-in irradiation unit, and the first edge is relative to the second edge.
In some embodiments, a combination of the first sinuous connecting line substantially one or more W font.
In some embodiments, the first concatenation irradiation unit substantially rectangle.
In some embodiments, the length of the first sinuous connecting line is approximately equal to a center frequency of operation of the low-frequency band
Half wavelength.
In some embodiments, the length of the first concatenation irradiation unit is approximately equal to a center frequency of operation of the low-frequency band
Half wavelength.
In some embodiments, antenna system further include: outside a coaxial wire, including a center conductor and a conductor
Shell, wherein the anode of the signal source is coupled to first load point and second load point via the center conductor, and the letter
The cathode in number source is coupled to first grounding point and second grounding point via the conductor casing.
In some embodiments, the antenna system further include: a reflux inhibits component, is coupled to the conductor casing, wherein
The reflux inhibits component to be used to attract the electric current of the conductor casing, is radiated with preventing the coaxial wire from generating.
In some embodiments, which inhibits a component substantially L-shaped.
In some embodiments, the length of reflux inhibition component is approximately equal to a center frequency of operation of the low-frequency band
Quarter-wave.
In some embodiments, which inhibits the gap of component and the first dipole antenna component about between 2mm to 3mm
Between.
In some embodiments, antenna system further include: one second sinuous connecting line；One second concatenation irradiation unit, warp
The second feed-in irradiation unit is coupled to by the second sinuous connecting line；One third is wriggled connecting line；And one third concatenation radiation
Portion is coupled to the second ground connection irradiation unit via the sinuous connecting line of the third.
The present invention provides a kind of antenna system, can have and interfere between high-gain, low insertion loss, few frequency band and low
The characteristics such as coaxial cable beta radiation.The configuration of the present invention is simple is easy to implement to operate in various communication device, can enjoy big
Quantify the commercial value of production.
Detailed description of the invention
Fig. 1 shows the schematic diagram of antenna system described in an embodiment according to the present invention；
Fig. 2 shows the schematic diagram of antenna system described in an embodiment according to the present invention；
Fig. 3 shows the schematic diagram of antenna system described in an embodiment according to the present invention；And
Fig. 4 shows the schematic diagram of antenna system described in an embodiment according to the present invention.
Primary clustering symbol description:
100,200,300,400 antenna system
110 first dipole antenna components
111 first load points
112 first grounding points
120 first feed-in irradiation units
The first edge of 121 first feed-in irradiation units
The first edge of 122 first feed-in irradiation units
The protrusion of 125 first feed-in irradiation units
130 first ground connection irradiation units
The open slot of 135 first ground connection irradiation units
140 second dipole antenna components
141 second load points
142 second grounding points
150 second feed-in irradiation units
160 second ground connection irradiation units
190 signal sources
271 first sinuous connecting lines
272 first concatenation irradiation units
273 the 4th sinuous connecting lines
274 the 4th concatenation irradiation units
350 coaxial wires
The center conductor of 351 coaxial wires
The conductor casing of 352 coaxial wires
360 reflux inhibit component
471 second sinuous connecting lines
472 second concatenation irradiation units
473 thirds are wriggled connecting line
474 thirds concatenate irradiation unit
The length of Ll open slot
The edge of G1 open slot and the gap of protrusion
G2 reflux inhibits the gap of component and the first dipole antenna component
Specific embodiment
For objects, features and advantages of the present invention can be clearer and more comprehensible, specific embodiments of the present invention are cited below particularly out,
And cooperate appended attached drawing, it is described in detail below.
Fig. 1 shows the schematic diagram of antenna system 100 described in an embodiment according to the present invention.Antenna system 100 can use gold
Belong to material to be made, and may be disposed on a medium substrate, such as: a printed circuit board (Printed Circuit Board,
) or a FR4 (Flame Retardant 4) plate PCB.As shown in Figure 1, antenna system 100 includes at least one first dipole antenna
Line component 110 and one second dipole antenna component 140.First dipole antenna component 110 and the second dipole antenna component 140 all by
Same signal source 190 is excited, and wherein signal source 190 can be a radio frequency (Radio Frequency, RF) module.First is even
Pole antenna module 110 operates in a low-frequency band, and the second dipole antenna component 140 operates in a high frequency band.For example,
Aforementioned lower frequency frequency band it is reducible between 2400MHz between 2500MHz, and aforementioned high frequency band it is reducible between 5150MHz extremely
Between 5850MHz, so that antenna system 100 can support the dual frequency operation of Wi-Fi and Bluetooth.
First dipole antenna component 110 includes one first feed-in irradiation unit 120 and one first ground connection irradiation unit 130.Second
Dipole antenna component 140 includes one second feed-in irradiation unit 150 and one second ground connection irradiation unit 160.First feed-in irradiation unit 120
It can be each substantially a longer rectangle with the first ground connection irradiation unit 130.Second feed-in irradiation unit 150 and the second ground connection irradiation unit
160 can be each substantially a shorter rectangle (such as: the length of aforementioned longer rectangle is about the two of the length of aforementioned shorter rectangle
Times).One second load point 141 of one first load point 111 of the first feed-in irradiation unit 120 and the second feed-in irradiation unit 150 is all
It is coupled to the anode of signal source 190.One first grounding point 112 and second of the first ground connection irradiation unit 130 is grounded irradiation unit 160
One second grounding point 142 is all coupled to the cathode of signal source 190.First feed-in irradiation unit 120 has a protrusion 125.It is prominent
The width of part 125 is narrower compared with the width of the rest part of the first feed-in irradiation unit 120 out.First ground connection irradiation unit 130 has
One open slot 135.First load point 111 is adjacent to protrusion 125, and the first grounding point 112 is adjacent to open slot
135.Protrusion 125 can with substantially one relatively narrow vertical bar shaped, and open slot 135 can with substantially one wider vertical bar shaped,
Middle protrusion 125 extends within open slot 135.In terms of size of components, the length of the first feed-in irradiation unit 120 and
The length of first ground connection irradiation unit 130 is approximately equal to the quarter-wave (λ/4) of a center frequency of operation of aforementioned lower frequency frequency band,
The length of second feed-in irradiation unit 150 and the length of the second ground connection irradiation unit 160 are approximately equal to the center behaviour of aforementioned high frequency band
The quarter-wave (λ/4) of working frequency, the length L1 of open slot 135 are less than the center frequency of operation of aforementioned lower frequency frequency band
/ 8th wavelength (λ/8), and the clearance G 1 at the edge of protrusion 125 and open slot 135 be less than 1mm (such as: preferably
The length of clearance G 1 is 0.5mm).
In the present invention, protrusion 125 and open slot 135 are used to prevent the first dipole of current interference of high frequency band
Antenna module 110.Specifically, an equivalent condenser can be collectively formed in protrusion 125 and open slot 135, have
One capacitance of rather moderate.For low-frequency band, this equivalent condenser is considered as an open circuit (Open Circuit), be with
Its current distribution that will not influence the first dipole antenna component 110；For high frequency band, it is short that this equivalent condenser is considered as one
Road (Short Circuit) is after can flowing to the first feed-in irradiation unit 120 by the second feed-in irradiation unit 150 with high-frequency current, then
The second ground connection irradiation unit 160 is back to via the short circuit paths of protrusion 125 and open slot 135.Design of the invention can
It avoids the problem that traditional high-gain aerial often faces high frequency, low frequency radiation portion interferes with each other, need not also use additional frequency divider
The framework of (with insertion loss), therefore, the present invention at least have improvement antenna radiation performance, reduce insertion loss
(Insertion Loss), and the advantages such as cost are saved, it is highly suitable to be applied in various broadband antenna structures.
Fig. 2 shows the schematic diagram of antenna system 200 described in an embodiment according to the present invention.Fig. 2 is similar with Fig. 1, the two
Difference be that the antenna system 200 of Fig. 2 further includes one first sinuous connecting line 271 and one first concatenation irradiation unit 272,
In the first concatenation irradiation unit 272 via the first sinuous connecting line 271 be coupled to the first feed-in irradiation unit 120.Specifically, prominent
Part 125 is located at a first edge 121 of the first feed-in irradiation unit 120, and the first sinuous connecting line 271 is coupled to the first feed-in spoke
A second edge 122 in portion 120 is penetrated, wherein first edge 121 is relative to second edge 122.First sinuous connecting line 271 can be with
A substantially combination of one or more W font.First concatenation irradiation unit 272 can be with a substantially rectangle.First, which wriggles, connects
The length (this refers to the total length after it is straightened) of line 271 may approximately equal to the half of the center frequency of operation of aforementioned lower frequency frequency band
Wavelength (λ/2).The length of first concatenation irradiation unit 272 may approximately equal to the half of the center frequency of operation of aforementioned lower frequency frequency band
Wavelength (λ/2).Under this design, it can be considered that antenna system 200 includes connection of being wriggled by the first dipole antenna component 110, first
Line 271 and the first concatenation irradiation unit 272 are formed by an aerial array, wherein the first dipole antenna component 110 can be used as master
Radiator is wanted, the first sinuous connecting line 271 can produce minus phase radiation, and the first concatenation irradiation unit 272 can produce positive phase spoke
It penetrates.Since the first sinuous connecting line 271 has intensive and tortuous current path, each proximity of the first sinuous connecting line 271
Opposite direction is presented in surface current in section, and therefore, with regard to seeing it at a distance, minus phase radiation above-mentioned will be supported almost
Disappear.On the other hand, the positive phase radiation of the first concatenation irradiation unit 272 can then be generated with the radiation of the first dipole antenna component 110
Constructive interference, so that the entire gain of aerial array can be improved.In other embodiments, this aerial array also may include more a plurality of
Wriggle connecting line and more concatenation irradiation units, is not limited solely to that shown in Figure 2.Remaining feature of the antenna system 200 of Fig. 2 is all
It is similar with the antenna system 100 of Fig. 1, so two embodiments may achieve similar operating effect.
Fig. 3 shows the schematic diagram of antenna system 300 described in an embodiment according to the present invention.Fig. 3 is similar with Fig. 1, the two
Difference be, the antenna system 300 of Fig. 3 further include a coaxial wire (Coaxial Cable) 350 and one reflux inhibition group
Part 360.Coaxial wire 350 includes a center conductor 351 and a conductor casing 352, and wherein the anode of signal source 190 is in
Heart conducting wire 351 is coupled to the first load point 111 and the second load point 141, and the cathode of signal source 190 is via conductor casing 352
It is coupled to the first grounding point 112 and the second grounding point 142.Reflux inhibits component 360 to be coupled to conductor casing 352.Reflux inhibits
Component 360 can be with a substantially L-shaped.The length of reflux inhibition component 360 may approximately equal to the center frequency of operation of low-frequency band
Quarter-wave (λ/4).Reflux inhibit the clearance G 2 of component 360 and the first dipole antenna component 110 it is reducible between 2mm extremely
Between 3mm.Reflux inhibits component 360 to be used to attract the electric current of conductor casing 352, is radiated with preventing coaxial wire 350 from generating.
Under this design, the back flow current of coaxial wire 350 will be gathered in reflux and inhibit on component 360 and form resonant stationary wave
(Standing Wave), therefore, reflux inhibit component 360 that coaxial wire 350 can be effectively avoided for the first dipole antenna
Line component 110 causes radiation interference.Remaining feature of the antenna system 300 of Fig. 3 is all similar with the antenna system of Fig. 1 100, so
Two embodiments may achieve similar operating effect.
Fig. 4 shows the schematic diagram of antenna system 400 described in an embodiment according to the present invention.Fig. 4 and Fig. 1, Fig. 2, Fig. 3 phase
Seemingly, difference therebetween is, the antenna system 400 of Fig. 4 further includes that one second sinuous connecting line 471, one second concatenates irradiation unit
472, a third is wriggled, and connecting line 473, a third concatenate irradiation unit 474, one the 4th sinuous connecting line 273 and one the 4th is gone here and there
Connect irradiation unit 274.Second concatenation irradiation unit 472 is coupled to the second feed-in irradiation unit 150 via the second sinuous connecting line 471.The
Three concatenation irradiation units 474 are coupled to the second ground connection irradiation unit 160 via the third connecting line 473 that wriggles.Second sinuous connecting line 471
Length and the wriggle length (this refers to the total length after it is straightened) of connecting line 473 of third all may approximately equal to aforementioned high frequency band
The half wavelength (λ/2) of center frequency of operation.The length and third of second concatenation irradiation unit 472 concatenate irradiation unit 474
Length may approximately equal to the half wavelength (λ/2) of the center frequency of operation of aforementioned high frequency band.4th concatenation irradiation unit 274 passes through
First concatenation irradiation unit 272 is coupled to by the 4th sinuous connecting line 273.(this refers to that it is straightened to the length of 4th sinuous connecting line 273
Total length afterwards) may approximately equal to aforementioned lower frequency frequency band center frequency of operation half wavelength (λ/2).4th concatenation radiation
The length in portion 274 may approximately equal to the half wavelength (λ/2) of the center frequency of operation of aforementioned lower frequency frequency band.These are additional to wriggle
Yan connecting line, concatenation irradiation unit all can further promote the antenna gain of antenna system 400.Remaining of the antenna system 400 of Fig. 4
Feature is all similar with the antenna system 100,200,300 of Fig. 1, Fig. 2, Fig. 3, therefore these embodiments may achieve similar operation effect
Fruit.
To sum up, the present invention provides a kind of antenna system, can have and be done between high-gain, low insertion loss, few frequency band
It disturbs and the characteristics such as low coaxial cable beta radiation.The configuration of the present invention is simple, easy implementation operate in various communication device and work as
In, the commercial value of large production can be enjoyed.
It is worth noting that, above-described size of components, component parameter, element shapes and frequency range are all non-is
Restrictive condition of the invention.Antenna designers can need to adjust these setting values according to different.In addition, aerial system of the invention
System is not limited in the illustrated state of Fig. 1-Fig. 4.The present invention can only include any one or more embodiments of Fig. 1-Fig. 4
Any one or more feature.In other words, and the feature of not all diagram must be implemented on antenna system of the invention simultaneously
In.
Ordinal number in this description and in the claims, such as " first ", " second ", " third " etc., each other it
Between there is no precedence relationships sequentially, be only used for mark and distinguish two different components with same name.
Although the present invention discloses the range being as above not intended to limit the invention, Ren Heben with preferred embodiment
The technical staff in field should can make some changes and embellishment without departing from the spirit and scope of the present invention, because
This protection scope of the present invention should regard subject to the range institute defender of appended claims.
Claims (20)
1. a kind of antenna system, the antenna system include:
One first dipole antenna component, the first dipole antenna component include one first feed-in irradiation unit and one first ground connection radiation
Portion, wherein the first feed-in irradiation unit has a protrusion, which has an open slot, and the protrusion
It extends partially within the open slot, to form an equivalent condenser；And
One second dipole antenna component, the second dipole antenna component include one second feed-in irradiation unit and one second ground connection radiation
Portion；
Wherein the first dipole antenna component and the second dipole antenna component are all excited by a signal source, first dipole antenna
Line component operates in a low-frequency band, and the second dipole antenna component operates in a high frequency band.
2. antenna system as described in claim 1, wherein the first feed-in irradiation unit, the first ground connection irradiation unit, this second
Feed-in irradiation unit and the second ground connection irradiation unit are respectively a rectangle.
3. antenna system as described in claim 1, wherein the protrusion is a vertical bar shaped, and the open slot is a vertical bar
The vertical bar shaped width of shape, the protrusion is narrower than the vertical bar shaped width of the open slot.
4. antenna system as described in claim 1, the center that wherein length of the open slot is less than the low-frequency band is grasped
/ 8th wavelength of working frequency.
5. antenna system as described in claim 1, wherein the gap at the edge of the protrusion and the open slot is less than
1mm。
6. antenna system as described in claim 1, wherein the protrusion and the open slot are for preventing the high frequency band
Current interference the first dipole antenna component.
7. antenna system as described in claim 1, wherein one first load point of the first feed-in irradiation unit and second feedback
One second load point for entering irradiation unit is all coupled to the anode of the signal source, and one first grounding point of the first ground connection irradiation unit
The cathode of the signal source is all coupled to one second grounding point of the second ground connection irradiation unit.
8. antenna system as claimed in claim 7, wherein first load point is adjacent to the protrusion, and first ground connection
Point is adjacent to the open slot.
9. antenna system as described in claim 1, further includes:
One first sinuous connecting line；And
One first concatenation irradiation unit, the first concatenation irradiation unit are coupled to first feed-in radiation via the first sinuous connecting line
Portion.
10. antenna system as claimed in claim 9, wherein the protrusion is located at one first side of the first feed-in irradiation unit
Edge, the first sinuous connecting line are coupled to a second edge of the first feed-in irradiation unit, and the first edge relative to this
Two edges.
11. antenna system as claimed in claim 9, wherein the first sinuous connecting line is one group of one or more W font
It closes.
12. antenna system as claimed in claim 9, wherein the first concatenation irradiation unit is a rectangle.
13. antenna system as claimed in claim 9, wherein the length of the first sinuous connecting line is equal to the one of the low-frequency band
The half wavelength of center frequency of operation.
14. antenna system as claimed in claim 9, wherein the length of the first concatenation irradiation unit is equal to the one of the low-frequency band
The half wavelength of center frequency of operation.
15. antenna system as claimed in claim 7, further includes:
One coaxial wire, the coaxial wire include a center conductor and a conductor casing, wherein the anode of the signal source
Be coupled to first load point and second load point via the center conductor, and the cathode of the signal source via the conductor outside
Shell is coupled to first grounding point and second grounding point.
16. antenna system as claimed in claim 15, further includes:
One reflux inhibits component, which inhibits component to be coupled to the conductor casing, and wherein the reflux inhibits component for attracting
The electric current of the conductor casing, to prevent the coaxial wire from generating radiation.
17. antenna system as claimed in claim 16, it is a L-shaped that wherein the reflux, which inhibits component,.
18. antenna system as claimed in claim 16, wherein the reflux inhibits the length of component to be equal to the one of the low-frequency band
The quarter-wave of center frequency of operation.
19. antenna system as claimed in claim 16, wherein the reflux inhibits between component and the first dipole antenna component
Gap is between 2mm between 3mm.
20. antenna system as described in claim 1, further includes:
One second sinuous connecting line；
One second concatenation irradiation unit, the second concatenation irradiation unit are coupled to second feed-in radiation via the second sinuous connecting line
Portion；
One third is wriggled connecting line；And
One third concatenates irradiation unit, which concatenates irradiation unit and be coupled to the second ground connection radiation via the sinuous connecting line of the third
Portion.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510256067.6A CN106299613B (en) | 2015-05-19 | 2015-05-19 | Antenna system |
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| CN201510256067.6A CN106299613B (en) | 2015-05-19 | 2015-05-19 | Antenna system |
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| CN106299613A CN106299613A (en) | 2017-01-04 |
| CN106299613B true CN106299613B (en) | 2019-08-30 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110911824B (en) * | 2018-09-18 | 2021-08-17 | 启碁科技股份有限公司 | Antenna structure |
| CN111063987B (en) * | 2018-10-16 | 2022-05-03 | 宏碁股份有限公司 | Electronic device back cover and electronic device |
| CN112582790B (en) * | 2019-09-29 | 2023-11-17 | 启碁科技股份有限公司 | Antenna system |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW527749B (en) * | 2002-03-02 | 2003-04-11 | Phycomp Taiwan Ltd | Dual-band dipole antenna and its use within notebook computers |
| EP1569299B1 (en) * | 2002-11-27 | 2008-10-22 | Taiyo Yuden Co., Ltd. | Antenna, dielectric substrate for antenna, radio communication card |
| CN1734836B (en) * | 2004-08-10 | 2010-11-17 | 富士康(昆山)电脑接插件有限公司 | Antenna |
| US7106259B2 (en) * | 2004-08-20 | 2006-09-12 | University Scientific Industrial Co., Ltd. | Planar inverted-F antenna |
| TWM331199U (en) * | 2007-08-07 | 2008-04-21 | Aiptek Int Inc | Wide-frequency dipole antenna |
| JP2010278586A (en) * | 2009-05-27 | 2010-12-09 | Casio Computer Co Ltd | Multi-band planar antenna and electronic device |
| CN102157770B (en) * | 2011-04-11 | 2014-02-12 | 江苏捷士通科技股份有限公司 | Switching device of coaxial cable and air microstrip line |
| CN203674399U (en) * | 2013-12-24 | 2014-06-25 | 启碁科技股份有限公司 | Antenna structure |
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