CN101471489B - Double-frequency antenna - Google Patents

Double-frequency antenna Download PDF

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Publication number
CN101471489B
CN101471489B CN2007103055665A CN200710305566A CN101471489B CN 101471489 B CN101471489 B CN 101471489B CN 2007103055665 A CN2007103055665 A CN 2007103055665A CN 200710305566 A CN200710305566 A CN 200710305566A CN 101471489 B CN101471489 B CN 101471489B
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CN
China
Prior art keywords
antenna
radiant body
frequency band
grounding parts
antenna according
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Expired - Fee Related
Application number
CN2007103055665A
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Chinese (zh)
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CN101471489A (en
Inventor
黄智勇
郑平熙
李长荣
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Arcadyan Technology Corp
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Arcadyan Technology Corp
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Priority to CN2007103055665A priority Critical patent/CN101471489B/en
Publication of CN101471489A publication Critical patent/CN101471489A/en
Application granted granted Critical
Publication of CN101471489B publication Critical patent/CN101471489B/en
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Abstract

An antenna is arranged on a circuit board provided with a signal transmission unit and a grounding unit. The antenna comprises a conductor support section, a radiator and a grounding section, wherein the radiator is used for operating a first frequency band and includes a feed-in branch section coupled with the signal transmission unit for receiving a feed-in signal; the grounding section is electrically connected with the radiator through the conductor support section and includes a slot cavity and a grounding branch section; the slot cavity extends from the top surface of the grounding section to the inner side of the grounding section; the grounding branch section is coupled with the grounding unit; and a resonant cavity is formed between the radiator and the slot cavity and has a resonant frequency for operating a second frequency band.

Description

Dual-band antenna
Technical field
The invention relates to a kind of antenna, and particularly relevant for a kind of multi-band planar inverted-f shape antenna (Planar Inverse-F Antenna, IFA).
Background technology
In the epoch now that development in science and technology is maked rapid progress, the antenna that sizes is light and handy is developed, to be applied in the day by day light and handy portable electric device of various sizes (being for example mobile phone or notebook computer) or radio transmitting device (for example AP).For instance, structure is light and handy, transmission usefulness is good and can be arranged on easily planar inverted F-antenna (the Planar Inverse-FAntenna of portable electric device inwall, PIFA) exist, and be widely used in the wireless transmission or radio communication device of multiple portable electric device.
For instance, ground signalling is transmitted via peripheral conductors layer and the internal layer of coaxial cable (Coaxial Cable) respectively with the signal of wanting via the PIFA transmission.In conventional art, most signal feed-in point and the signal ground points that peripheral conductors layer and the inner conductor layer of coaxial cable are welded in respectively PIFA are exported via PIFA with the signal that tendency to develop is defeated.Yet conventional art has coaxial cable and holds caducous problem.In addition, the extra coaxial cable that increases has improved the cost burden of product simultaneously.
Summary of the invention
The present invention proposes a kind of antenna, and it can receive FD feed and ground signalling via the circuit in printed circuit board (PCB) (Printed Circuit Board, PCB).So, compared to conventional planar inverted-F antenna (Planar Inverse-F Antenna, PIFA), the cost burden that the antenna that the present invention proposes can avoid coaxial cable (CoaxialCable) the caducous problem of appearance and coaxial cable to increase.
Propose a kind of antenna according to the present invention, be arranged on circuit board, circuit board is provided with signal transmission unit and ground unit.Antenna comprises conductor support portion, radiant body (Radiator) and grounding parts.Radiant body is in order to operate in the first frequency band, and radiant body comprises the feed-in branching portion.The feed-in branching portion is coupled to signal transmission unit, to receive FD feed.Grounding parts is electrically connected via conductor support portion and radiant body, and grounding parts comprises slotted eye cavity (Slot Cavity) and ground connection branching portion.The slotted eye cavity extends to the inside of grounding parts from the end face of grounding parts.The ground connection branching portion is coupled to ground unit.Wherein, form resonant cavity (Resonant Cavity) between radiant body and slotted eye cavity, the resonance frequency of resonant cavity operates in the second frequency band.
The present invention also comprises side plate, is the fixed mechanism of antenna.The bottom of side plate and grounding parts is vertical connection, and antenna can vertically be placed on circuit board by the support of side plate, and antenna is fixed on circuit board together with other element combination on circuit board.But extend the bottom of side plate grounding parts, can also be for external.
For foregoing of the present invention can be become apparent, a preferred embodiment cited below particularly, and cooperation accompanying drawing are described in detail below:
Description of drawings
Fig. 1 illustrates the stereogram of the antenna of the preferred embodiment of the present invention.
Fig. 2 illustrates the schematic diagram of the antenna 10 of the present embodiment.
Fig. 3 illustrates the voltage standing wave ratio oscillogram of the antenna 10 of Fig. 2.
Perpendicular polarization field pattern figure when the antenna 10 that Fig. 4 A～4C illustrates respectively Fig. 2 operates in communication band 2.40GHz, 2.45GHz and 2.50GHz.
Perpendicular polarization field pattern figure when the antenna 10 that Fig. 5 A～5C illustrates respectively Fig. 2 operates in communication band 4.90GHz, 5.4GHz and 5.850GHz.
Fig. 6 illustrates the relation table of Fig. 4 and Fig. 5 medium frequency and gain.
Horizontal polarization field pattern figure when the antenna 10 that Fig. 7 A～7C illustrates respectively Fig. 2 operates in communication band 2.40GHz, 2.45GHz and 2.50GHz.
Horizontal polarization field pattern figure when the antenna 10 that Fig. 8 A～8C illustrates respectively Fig. 2 operates in communication band 4.90GHz, 5.4GHz and 5.850GHz.
Fig. 9 illustrates the relation table of Fig. 7 and Fig. 8 medium frequency and gain.
Figure 10 illustrates another stereogram of the antenna 10 of Fig. 1.
The main element symbol description
100：PCB
200: signal transmission unit
300a, 300b: ground unit
10: antenna
12: radiant body
12a: feed-in branching portion
12b, 12c: protuberance
14: grounding parts
14a: cavity
14b: ground connection branching portion
16: the conductor support portion
18: resonant cavity
Uf: end face
S1～s2: microscler fluting
N1, n2: recess
20: side plate
Embodiment
The embodiment of the present invention proposes a kind of planar inverted F-antenna (Planar Inverse-F Antenna, PIFA), and it can receive FD feed and ground signalling via the circuit on printed circuit board (PCB) (Printed Circuit Board, PCB).
Please refer to Fig. 1, it illustrates the stereogram of the antenna of the preferred embodiment of the present invention.Antenna 10 is arranged on PCB 100, comprises signal transmission unit 200, ground unit 300a and 300b on PCB 100, in order to provide respectively FD feed and ground signalling to antenna 10.
Please refer to Fig. 2, it illustrates the schematic diagram of the antenna 10 of the present embodiment.Antenna 10 for example is applied in via motor and electronics engineers (The Institute of Electrical and ElectronicsEngineers, IEEE) communication protocol 802.11 a/b/g/n that work out carry out the electronic installation of communication, and antenna 10 is supported the communication of communication band 2.4GHz to 2.5GHz and communication band 4.9GHz to 5.85GHz.
Antenna 10 comprises radiant body (Radiator) 12, grounding parts 14 and conductor support portion 16.Antenna 10 is for example PIFA, and wherein radiant body 12, grounding parts 14 and conductor support portion 16 all are positioned on same conducting plane.The thickness of this conducting plane between 0.4 micron (millimeter, mm) between 0.8mm.
Radiant body 12 is adjusted to operate in the first communication band, and wherein the length of radiant body 12 is near the quarter-wave of the centre frequency of the first communication band.Radiant body 12 comprises feed-in branching portion 12a, and its autoradiolysis body 12 extends downward the another side of PCB 100, and the corresponding radiant body 12 of PCB 100 can be provided with a perforation to the part of downward-extension; Feed-in branching portion 12a can have a hook arrangement, and this hook arrangement extends to the another side of PCB 100.Feed-in branching portion 12a is electrically connected to signal transmission unit 200, to receive FD feed.The tie point that is connected to signal transmission unit 200 in feed-in branching portion 12a is essentially the signal feed-in point in antenna 10.
Grounding parts 14 is connected with radiant body 12 via conductor support portion 16, grounding parts 14 comprises cavity (Cavity) 14a and ground connection branching portion 14b, ground connection branching portion 14b extends downward the another side of PCB100 from grounding parts 14, the relative grounding parts 14 of PCB 100 can be provided with a perforation to the part of downward-extension.Ground connection branching portion 14b can have a hook arrangement, and this hook arrangement extends to the another side of PCB 100.Ground connection branching portion 14b is electrically connected to ground unit 300b, to receive ground signalling.The tie point that is connected to ground unit 300b in ground connection branching portion 14b is essentially the signal ground point in antenna 10.
Cavity 14a extends to the inside of grounding parts 14 from the end face uf of grounding parts 14, cavity 14a for example has L shaped structure.Radiant body 12, conductor support portion 16 part adjacent with the cavity 14a of grounding parts 14 form resonant cavity (Resonant Cavity) 18 jointly, and resonant cavity 18 operates in the second frequency band.The second frequency band is for example higher than the first frequency band.
Cavity 14a comprises microscler fluting (Slot) s1, and microscler fluting s1 and end face uf arrange each other abreast.Microscler fluting s1 has blind end and openend, and opening direction is parallel with end face uf.
Radiant body 12 comprises recess n1, and is mutually vertical with radiant body 12 on the opening direction matter of recess n1.Recess n1 and resonant cavity 18 are interconnected.Radiant body 12, conductor support portion 16 and grounding parts 14 define recess n2, and the opening direction of the opening direction of recess n2 and recess n1 is in fact mutually vertical, and recess n2 and resonant cavity 18 are interconnected.Radiant body 12 also comprises protuberance 12b, protuberance 12b in fact with the adjacent setting of feed-in branching portion 12a, for example be arranged in parallel in the present embodiment.
The length of microscler fluting s1, recess n1, n2 and protuberance 12b and width are relevant to current path length in resonant cavity 18 and the impedance of resonant cavity 18, with adjustment and the coupling as its impedance.In the present embodiment, microscler fluting s1, recess n1, n2 and protuberance 12b all have specific length and width, make when resonant cavity 18 operates in the second frequency band, and resonant cavity 18 is essentially impedance matching with signal transmission unit 200.
Radiant body 12 also comprises protuberance 12c, and protuberance 12c is connected with conductor support portion 16, and protuberance 12c be arranged in parallel with radiant body 12 in fact.Protuberance 12c, conductor support portion 16 and grounding parts 14 also define microscler fluting s2.Microscler fluting s2 has blind end and openend, and the opening direction of microscler fluting s2 is parallel with radiant body 12.
The length of microscler fluting s2 and protuberance 12c and width are relevant to current path length in radiant body 12 and the impedance of radiant body 12, with adjustment and the coupling as its impedance.In the present embodiment, microscler fluting s2 and protuberance 12c all have specific length and width, make when radiant body 12 operates in the first frequency band, and radiant body 12 is essentially impedance matching with transmission unit 200.
Please refer to Fig. 3, it illustrates the standing-wave ratio oscillogram of the antenna 10 of Fig. 2.Equal 2 frequency range reference line L1 as can be known according to voltage standing wave ratio (Voltage Standing Wave Ratio, VSWR), first frequency band of the present embodiment is in fact between 2.1GHz to 2.7GHz; The second frequency band extremely surpasses 6GHz between 4.2GHz in fact.Wherein, the second frequency band is higher than the first frequency band, the first frequency band comprises in fact the LF communication frequency band 2.4GHz to 2.5GHz that defines in communication protocol 802.11 a/b/g/n, and the second frequency band comprises in fact the HF communication frequency band 4.9GHz～5.85GHz that defines in communication protocol 802.11 a/b/g/n.The actual VSWR numerical value (representing with measurement point 1～4 respectively in Fig. 3) that equals 2.4GHz, 2.5GHz, 4.9GHz and 5.85GHz in frequency is respectively 1.5641,1.8521,1.2693 and 1.6168.So, the antenna 10 of the present embodiment can be supported the communication of communication protocol 802.11 a/b/g/n effectively.
The gain perpendicular polarization field pattern figure of antenna 10 is as shown in Fig. 4 A～4C and Fig. 5 A～5C, and the relation table of its frequency and gain as shown in Figure 6.Vertical field pattern figure when the antenna 10 that the perpendicular polarization field pattern figure the when antenna 10 that Fig. 4 A～4C illustrates respectively Fig. 2 operates in communication band 2.40GHz, 2.45GHz and 2.50GHz, Fig. 5 A～5C illustrate respectively Fig. 2 operates in communication band 4.90GHz, 5.40GHz and 5.85GHz; Fig. 6 illustrates the relation table of Fig. 4 A～4B and Fig. 5 A～5B medium frequency and gain.
The gain level polarization field pattern figure of antenna 10 is as shown in Fig. 7 A～7C and Fig. 8 A～8C, and the relation table of its frequency and gain as shown in Figure 9.It is the antenna 10 of Fig. 2 horizontal polarization field pattern figure when operating in communication band 2.40GHz, 2.45GHz and 2.50GHz that Fig. 7 A～7C illustrates respectively, the horizontal polarization field pattern figure the when antenna 10 that Fig. 8 A～8C illustrates respectively Fig. 2 operates in communication band 4.90GHz, 5.40GHz and 5.85GHz; Fig. 9 illustrates the relation table of Fig. 7 A～7B and Fig. 8 A～8B medium frequency and gain.
The antenna 10 of the present embodiment also for example has fixed mechanism, in order to antenna 10 is fixed on PCB 100.In the present embodiment, fixed mechanism is for example side plate 20, as shown in figure 10.Extend its bottom from the grounding parts 14 of antenna 10, and the angle that side plate 20 and antenna are 10 for example equals 90 degree.Side plate 20 is parallel each other with PCB 100, so that antenna 10 is vertically fixed on PCB 100, and the rotation of avoiding antenna 10 to produce direction A with respect to PCB 100.
Though only 20 situation explains as example take fixed mechanism as side plate in the present embodiment, yet the fixed mechanism that designs in antenna 10 is not limited to side plate 20, and more can be the fixed mechanism that other can reach close in fact fixed effect.
Though the situation that only be arranged in parallel each other take microscler fluting s1 and end face uf in the present embodiment explains as example, yet microscler direction of slotting s1 is not limited to parallel with end face uf, and more can be other forms.Recess n1 and the opening direction of n2 are not limited to mutually vertical, and can be designed to other forms.
The disclosed antenna of the present embodiment has feed-in branching portion and ground connection branching portion, and it extends to signal transmission unit and ground unit on PCB from the radiant body of antenna itself and grounding parts respectively, and in order to receive FD feed and ground signalling.So, compared to traditional PI FA, the antenna of the present embodiment can carry out the feed-in of signal via the coaxial cable (Coaxial Cable) of welding, and can avoid coaxial cable to hold caducous problem and the extra cost burden that increases.Feed-in branching portion and ground connection branching portion can be made welding and make antenna be fixed on circuit board in the automated production process together with other element on circuit board, must additionally not increase the step of production.
In addition, compared to traditional PI FA, the antenna of the present embodiment has more the advantage that can stand on easily on PCB.
In sum, although the present invention with a preferred embodiment openly as above, so it is not to limit the present invention.The persond having ordinary knowledge in the technical field of the present invention, without departing from the spirit and scope of the present invention, when being used for a variety of modifications and variations.Therefore, protection scope of the present invention is as the criterion when looking claims person of defining.

Claims (11)

1. an antenna, be arranged on a circuit board, and this circuit board is provided with a signal transmission unit and a ground unit, and this antenna comprises:
One conductor support portion;
One radiant body, in order to operate in one first frequency band, to be responsible for generating the frequency range of 2.1GHz to 2.7GHz, this radiant body comprises:
One feed-in branching portion is coupled to this signal transmission unit, to receive a FD feed; This antenna also comprises:
One grounding parts is electrically connected via this conductor support portion and this radiant body, and this grounding parts comprises:
One slotted eye cavity, this cavity extend to the inside of this grounding parts from an end face of this grounding parts; And
One ground connection branching portion is coupled to this ground unit;
Wherein, this radiant body and this cavity form a resonant cavity, and this resonant cavity operates in one second frequency band, to be responsible for generating 4.2GHz to the frequency range that surpasses 6GHz.
2. antenna according to claim 1, wherein this cavity comprises one first microscler fluting, this first microscler fluting has one first blind end and one first openend, the opening direction of this first microscler fluting is parallel with this end face, and the length of this first microscler fluting and width are relevant to the frequency height of this second frequency band.
3. antenna according to claim 1, wherein this radiant body comprises:
One first recess, the opening direction of this first recess are mutually vertical with this radiant body in fact, and this first recess and this resonant cavity are interconnected, and the size of this first recess is relevant to the frequency height of the second frequency band.
4. antenna according to claim 1, wherein this radiant body, this conductor support portion and this grounding parts define one second recess, the opening direction of this second recess and this end face are parallel to each other in fact, this second recess and this resonant cavity are interconnected, and the size of this second opening is relevant to the frequency height of the second frequency band.
5. antenna according to claim 1, wherein this radiant body also comprises:
One first protuberance, in fact with the adjacent setting of this feed-in branching portion, the length of this first protuberance and width are relevant to the frequency height of this second frequency band.
6. antenna according to claim 1, wherein this radiant body also comprises:
One second protuberance is connected with this conductor support portion, and the length of this second protuberance and width are relevant to the frequency height of this first frequency band.
7. antenna according to claim 6, wherein this second protuberance, this conductor support portion and this grounding parts also define one second microscler fluting, this second microscler fluting has one second blind end and one second openend, the opening direction of this second microscler fluting is parallel with this radiant body body, and the length of this second microscler fluting and width are relevant to the frequency height of this first frequency band.
8. antenna according to claim 1, wherein this feed-in branching portion and this ground connection branching portion extend downward the another side of this circuit board, with so that this antenna be coupled on this circuit board.
9. antenna according to claim 1, wherein this grounding parts has more a fixed mechanism, with so that this antenna vertically be fixed on this circuit board.
10. antenna according to claim 1, wherein this radiant body, this conductor support portion and this grounding parts are formed at same planar structure.
11. antenna according to claim 1, wherein this antenna is a planar inverted F-antenna.
CN2007103055665A 2007-12-27 2007-12-27 Double-frequency antenna Expired - Fee Related CN101471489B (en)

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Application Number Priority Date Filing Date Title
CN2007103055665A CN101471489B (en) 2007-12-27 2007-12-27 Double-frequency antenna

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Application Number Priority Date Filing Date Title
CN2007103055665A CN101471489B (en) 2007-12-27 2007-12-27 Double-frequency antenna

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CN101471489A CN101471489A (en) 2009-07-01
CN101471489B true CN101471489B (en) 2013-06-26

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112216989B (en) * 2020-09-02 2022-05-13 珠海格力电器股份有限公司 Ultra-wideband WIFI microstrip antenna, amplification method and small WIFI equipment

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6476769B1 (en) * 2001-09-19 2002-11-05 Nokia Corporation Internal multi-band antenna
CN1706070A (en) * 2002-10-24 2005-12-07 诺基亚有限公司 Radio device and antenna structure
CN101075700A (en) * 2006-05-16 2007-11-21 智易科技股份有限公司 Double-frequency reversed F-typed antenna

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6476769B1 (en) * 2001-09-19 2002-11-05 Nokia Corporation Internal multi-band antenna
CN1706070A (en) * 2002-10-24 2005-12-07 诺基亚有限公司 Radio device and antenna structure
CN101075700A (en) * 2006-05-16 2007-11-21 智易科技股份有限公司 Double-frequency reversed F-typed antenna

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Granted publication date: 20130626

Termination date: 20171227