EP2833475B1 - Antenne dipôle - Google Patents

Antenne dipôle Download PDF

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Publication number
EP2833475B1
EP2833475B1 EP14167338.4A EP14167338A EP2833475B1 EP 2833475 B1 EP2833475 B1 EP 2833475B1 EP 14167338 A EP14167338 A EP 14167338A EP 2833475 B1 EP2833475 B1 EP 2833475B1
Authority
EP
European Patent Office
Prior art keywords
radiating element
dipole antenna
bent portion
feed
point
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP14167338.4A
Other languages
German (de)
English (en)
Other versions
EP2833475A1 (fr
Inventor
Shing-Chiang Lin
Liang-San Hsu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Compal Broadband Networks Inc
Original Assignee
Compal Broadband Networks Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Compal Broadband Networks Inc filed Critical Compal Broadband Networks Inc
Publication of EP2833475A1 publication Critical patent/EP2833475A1/fr
Application granted granted Critical
Publication of EP2833475B1 publication Critical patent/EP2833475B1/fr
Not-in-force legal-status Critical Current
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/06—Details
    • H01Q9/065—Microstrip dipole 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
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
    • H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
    • H01Q5/364—Creating multiple current paths
    • H01Q5/371—Branching current paths
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/28—Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines
    • H01Q9/285—Planar dipole

Definitions

  • the invention relates to a dipole antenna, and more particularly, to a dipole antenna with bent structures for reducing the antenna dimension and supporting multiple frequency bands.
  • a wireless communication device or system transmits and receives wireless wave via an antenna, as such to deliver or exchange wireless signals, and as further to access wireless networks.
  • the communication system of a wireless local network is in general divided into a plurality of frequency bands, therefore, an antenna complying with operation of multiple frequency bands becomes more demanding.
  • the trend of the antenna dimension is getting smaller to accommodate with the same interests, i.e., smaller dimension, of electronic products.
  • FIG. 1 illustrates a schematic diagram of a conventional dipole antenna 10.
  • the conventional dipole antenna 10 comprises radiating elements 100 and 102, and a coaxial transmission line 104.
  • the radiating elements 100 and 102 are connected to the signal source and the ground of the coaxial transmission line 104, respectively.
  • the dipole antenna 10 is not required to connect to a ground plane so that it is insensitive to environmental stimuli.
  • the dimension of the dipole antenna 10 is relatively large.
  • the total length of the dipole antenna 10 is about half of the wave length ( ⁇ /2), which means the dipole antenna 10 goes larger when the operating frequency is lowered. Therefore, the conventional dipole antenna 10 is mostly used as an external antenna.
  • electronic products with an external antenna do not seem to be stylish, so it lowers the customers' desire to purchase the products.
  • the dipole antenna 10 can only operate in a single frequency band so that it cannot meet the demand for the communication system nowadays with multiple frequency bands.
  • the dipole antenna is designed to contain two different sized radiating elements, while one is shorter and the other is longer.
  • the sizes of the two radiating elements are adjusted to appropriate values such that the fundamental frequency and the harmonics (i.e. multiplication of the fundamental frequency) of the dipole antenna cover two operating frequency bands.
  • the high frequency band is covered by the multiplication of the fundamental frequency, thereby inducing a dead spot for wireless data transmission due to a null point of the radiation pattern.
  • the antenna gain and the antenna efficiency are reduced.
  • the structure of such antenna is more complicated. Therefore, the manufacturing difficulty, the cost, and the performance of such dipole antenna are unsatisfactory.
  • An alternative but known technique is to design the two radiating elements of the dipole antenna in a form of a double-sided trapezoid structure (i.e. the two radiating elements are disposed on the front and backside of the substrate), which therefore generates multiple current paths for achieve high bandwidth.
  • the overlapping portion where the projection of the radiating elements on the front of the substrate overlaps the radiating elements on the backside of the substrate may be adjusted for impedance matching in an operating frequency band.
  • the manufacturing process of this antenna design is very complex. It requires a dual layer board and via, and therefore, the manufacturing cost is high.
  • US 2008/0174505 A1 discloses an ultra-wideband shorted dipole antenna including a coaxial cable line and first and second open-loop radiating metal plates with substantially the same shape.
  • the coaxial cable line has a central conducting wire and an outer grounder sheath.
  • the first and second open-loop radiating metal plates are symmetrically disposed on two sides of the antenna to form two arms of the antenna and are electrically connected to each other.
  • Each of the first and second open-loop radiating metal plates has a signal feeding point electrically connected to the central conducting wire or the outer grounder sheath of the coaxial cable line.
  • US 2006/0082515 A1 discloses an omnidirectional antenna and method of producing the omnidirectional antenna.
  • the antenna has a first board with a ground plane on a first side of the first board and a second board with one or more dipole antennas located next to a first edge of the second board and one or more dipole antennas located next to a second edge opposite the first edge.
  • the second board is located approximately perpendicular to the first board and approximately centered about the first board.
  • EP 1780829 A1 discloses that a communication distance difference due to an attached object can be canceled, and an RFID system can be provided which has approximately the same communication distance regardless of an attached position (surface) of a tag.
  • a tag antenna used for such the RFID system is for transmitting/receiving a radio signal to/from an RFID reader/writer in an RFID system has a pair of antenna elements centered on a feeding point and when a carrier wavelength of the radio signal is ⁇ , each of the pair of the antenna elements includes a dipole portion which has a length from the feeding point of approximate ⁇ /4 and a plurality of bending portions as well as a circular polarized wave generation portion linked to an end of the dipole portion.
  • An objective of the present invention is to provide an antenna supporting multi-band operation and having simple structure and favorable efficiency, so as to lower the manufacturing cost of an antenna for mass production.
  • FIG. 2 is a schematic diagram of a dipole antenna 20 according to an embodiment of the present invention.
  • the dipole antenna 20 includes a dielectric substrate 200 which presents as a plane, radiating elements 202 and 204, a feed-in gap 206, and feed-in points 208 and 210.
  • the radiating elements 202 and 204 formed on the dielectric substrate 200 have bent portions 2020, 2022, and bent portions 2040, 2042.
  • the radiating elements 202 and 204 are side-by-side disposed across the horizontal plane of the dielectric substrate 200, and are spaced out by a feed-in gap 206.
  • the feed-in points 208 and 210 are formed on the radiating elements 202 and 204, respectively, to connect to the central conductor and the outer grounded conductor of a coaxial cable.
  • the feed-in point 208 is substantially located at the middle point between the bent portion 2020 and the bent portion 2022, while the feed-in point 210 is substantially located at the middle point between the bent portion 2040 and the bent portion 2042.
  • the spacing between the feed-in points 208 and 210 is substantially equal to the feed-in gap 206.
  • the top half A1 and the bottom half B1 of the radiating element 202 are not symmetric.
  • the top half A2 and bottom half B2 of the radiating element 204 is not symmetric either, wherein the top half portion and the bottom half portion are equally demarcated along a horizontal plane substantially characterized by the vertical middle point of the radiation elements 202, 204.
  • the vertical flip of the first radiating element 202 and the second radiating element 204 are symmetric horizontally along substantially the center point of the feed-in gap 206, i.e., the orientation of the first radiating element 202 is a 180 degree transposition from the second radiating element 204. Therefore, there is more than one current resonant path, and each one may have different length.
  • Figures 3 and 4 illustrate the resonant paths of the low frequency current and the high frequency current in the dipole antenna 20, respectively.
  • the dipole antenna 20 has at least two different current resonant paths, in which each current resonant path has different length.
  • One current resonant path flows from the top half segment A1 of the radiating element 202 to the bottom half segment B2 of the radiating element 204 via the feed-in gap 206.
  • the dipole antenna 20 may resonate in a relatively low frequency band. For example, if the length of this current resonant path is 64 mm (i.e., approximately 0.51 ⁇ ), the dipole antenna 20 may resonate in a 2.4GHz frequency band.
  • the other current resonant path flows from the top half segment A2 of the radiating element 204 to the bottom half segment B1 of the radiating element 202 via the feed-in gap 206.
  • the dipole antenna 20 may resonate in a relatively high frequency band. For example, if the length of this current resonant path is 26 mm (i.e., approximately 0.46 ⁇ ), the dipole antenna 20 may resonate in a 5GHz frequency band.
  • the dipole antenna 20 may be used as an antenna in a built-in wireless local area network (WLAN) device to transmit and receive 2.4GHz and 5GHz radio signals, and support multiple wireless communication protocols (e.g. IEEE 802.11 a/b/g/ac, Bluetooth, HiperLAN). In such case, the dipole antenna 20 may be fully contained in a narrow space as 45 x 13 mm 2 .
  • WLAN wireless local area network
  • the dipole antenna 20 of the present invention uses the bent portions 2020, 2022, 2040 and 2042 to create multiple current resonant paths with different lengths in geometrical structure. Consequently, the dipole antenna 20 may support multiple operating frequency bands in a minimized dimension compared to the conventional dipole antennas.
  • the radiating element 202 and the radiating element 204 may be disposed on the dielectric substrate 200 by printing and etching processes.
  • the dielectric substrate 200 may be a fiber glass composite laminate conforming to the FR4 specifications. Other kinds of dielectric substrate may be used depending on the application.
  • the dimension of the radiating elements 202 and 204 may be properly adjusted according to the operating frequency requirement.
  • the outward corner not facing to the gravity center of the radiation elements 202, 204 formed by the bent portions 2020, 2022 and the bent portions 2040, 2042 may be an oblique angle for reducing the parasitic capacitance due to the effect of bended path.
  • the amount of the bent portions is not limited.
  • the radiating elements 202 and 204 may additionally form the bent portions 2024 and 2044 to further reduce the dimension of the dipole antenna 20.
  • the inward corner facing the gravity center of the radiation elements 202, 204 formed by the bent portions 2020, 2022, 2024, 2040, 2042 and 2044 is a right angle, but is not limited herein.
  • the radiating element 202 and the radiating element 204 may be symmetric in accordance to the center point of the feed-in point 208 and feed-in point 210.
  • the dipole antenna may be asymmetric according to the practical consideration of the antenna design.
  • FIG. 5 shows the reflection coefficient of the dipole antenna 20 shown in Figure 2 .
  • the line with triangle markers represents the reflection coefficient of the conventional dipole antenna 10
  • the line with square markers represents a simulation result of the reflection coefficient for the dipole antenna 20
  • the line with circle markers represents a measurement result of the reflection coefficient for the dipole antenna 20. Since the feed-in gap 206 is adjustable, the dipole antenna 20 of the present invention can be designed to have larger reflection coefficient and better radiation efficiency.
  • the left portion of the dipole antenna 20 i.e., the radiating elements 202
  • the right portion i.e., the radiating elements 204
  • the radiation pattern of the dipole antenna 20 is omni-directional in the XZ plane without a null.
  • Figure 6 to Figure 9 illustrate the radiation patterns of the dipole antenna 20 operating in 2.45GHz, 5.15GHz, 5.55GHz, and 5.85GHz, respectively.
  • the geometric structure of the dipole antenna 20 is asymmetric, which affects the uniformity of current distribution. Therefore, the radiation pattern in YZ plane is slightly asymmetric.
  • Figure 10 shows the antenna gain and the radiation efficiency of the dipole antenna 20 operating between 2.4GHz and 5.85GHz.
  • the antenna gain is about 1.85 dBi while the radiation efficiency is about 97%.
  • the antenna gain is about 2.3 dBi while the radiation efficiency is about 96%.
  • Figure 11 shows a diagram of antenna power loss versus throughput of wireless local area network (WLAN) communication system when the dipole antenna 20 operates between 2.4GHz and 5GHz. As can be seen from Figure 11 , the WLAN communication system equipped with the dipole antenna 20 has a favorable data throughput.
  • WLAN wireless local area network
  • the present invention creates multiple current resonant paths by designing the bent direction and position of the radiating elements and inserting a proper feed-in gap such that the dipole antenna can operate in more than one frequency band.
  • the space required for disposing the dipole antenna is effectively reduced in the present invention, which benefits implementation of embedded antenna.
  • the structure of the dipole antenna in the present invention does not require any via.
  • the dipole antenna of the present invention can be realized on a general printed circuit board (PCB), e.g., an FR4 single layer PCB, for being precisely manufactured and thus achieving good antenna performance. Therefore, the manufacturing cost is reduced.
  • PCB printed circuit board

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  • Details Of Aerials (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)

Claims (10)

  1. Antenne dipôle (20) comprenant :
    un substrat diélectrique (200) ;
    un premier élément rayonnant (202) formé sur le substrat diélectrique (200) possédant une première partie courbée (2020) et une deuxième partie courbée (2022), dans laquelle la deuxième partie courbée (2022) est située au niveau d'une partie de moitié supérieure (A1) du premier élément rayonnant (202) et la première partie courbée (2020) est située au niveau d'une partie de moitié inférieure (B1) du premier élément rayonnant (202) ;
    un second élément rayonnant (204) formé sur le substrat diélectrique (200) possédant une troisième partie courbée (2040) et une quatrième partie courbée (2042), dans laquelle la troisième partie courbée (2040) est située au niveau d'une partie de moitié supérieure (A2) du second élément rayonnant (204) et la quatrième partie courbée (2042) est située au niveau d'une partie de moitié inférieure (B2) du second élément rayonnant (204) ;
    un écartement d'alimentation (206) situé entre le premier élément rayonnant (202) et le second élément rayonnant (204) sépare le premier élément rayonnant (202) et le second élément rayonnant (204) ;
    un premier point d'alimentation (208) situé entre la première partie courbée (2020) et la deuxième partie courbée (2022) ; et
    un second point d'alimentation (210) situé entre la troisième partie courbée (2040) et la quatrième partie courbée (2042) ;
    dans laquelle le premier élément rayonnant (202) et le second élément rayonnant (204) sont disposés côte à côte horizontalement à travers le substrat diélectrique (200) et dans laquelle le premier point d'alimentation (208) et le second point d'alimentation (210) sont séparés par l'écartement d'alimentation ; caractérisée en ce que
    la partie de moitié supérieure (A1) du premier élément rayonnant (202) n'est pas structurellement identique à la partie de moitié inférieure (B1) du premier élément rayonnant (202) ou à la partie de moitié supérieure (A2) du second élément rayonnant (204), et la partie de moitié inférieure (B2) du second élément rayonnant (204) n'est pas structurellement identique à la partie de moitié inférieure (B1 du premier élément rayonnant (202) ou à la partie de moitié supérieure (A2) du second élément rayonnant (204).
  2. Antenne dipôle (20) selon la revendication 1, caractérisée en ce que la première partie courbée (2020), la deuxième partie courbée (2022), la troisième partie courbée (2040) et/ou la quatrième partie courbée (2042) ont chacune deux côtés, dans laquelle un côté comporte un angle droit faisant face au centre de gravité des éléments à rayonnement (202, 204), et l'autre côté comporte un angle oblique ne faisant pas face au centre de gravité des éléments à rayonnement (202, 204).
  3. Antenne dipôle (20) selon la revendication 2, dans laquelle la largeur de trajectoire des coins formés par les parties courbées (2020, 2022, 2040, 2042) n'est pas uniforme.
  4. Antenne dipôle (20) selon l'une quelconque des revendications 1 à 3, caractérisée en ce que la partie de moitié supérieure et la partie de moitié inférieure sont délimitées de manière égale le long d'un plan horizontal sensiblement caractérisé par le point médian vertical des éléments à rayonnement (202, 204).
  5. Antenne dipôle (20) selon l'une quelconque des revendications 1 à 3, caractérisée en ce que le retournement vertical du premier élément rayonnant (202) et du second élément rayonnant (204) présente une symétrie axiale horizontalement sensiblement le long du point central de l'écartement d'alimentation (206), et l'orientation du premier élément rayonnant (202) est une transposition à 180 degrés vers le second élément rayonnant (204).
  6. Antenne dipôle (20) selon l'une quelconque des revendications 1 à 5, caractérisée en ce que le premier élément rayonnant (202) comporte en outre une cinquième partie courbée (2024), et le second élément rayonnant comporte en outre une sixième partie courbée (2044).
  7. Antenne dipôle (20) selon l'une quelconque des revendications 1 à 6, caractérisée en ce que le substrat diélectrique (200) est conforme aux spécifications FR4.
  8. Antenne dipôle (20) selon l'une quelconque des revendications 1 à 7, caractérisé en ce que l'antenne dipôle (20) ne contient aucun trou d'interconnexion.
  9. Antenne dipôle (20) selon la revendication 1, caractérisée en ce que le premier point d'alimentation (208) et le second point d'alimentation (210) sont reliés à un conducteur central et à un conducteur externe relié à la terre d'un câble coaxial, respectivement.
  10. Antenne dipôle (20) selon la revendication 1, caractérisée en ce que le premier élément rayonnant (202) et le second élément rayonnant (204) sont disposés sur le substrat diélectrique (200) par des procédés d'impression et de gravure.
EP14167338.4A 2013-07-29 2014-05-07 Antenne dipôle Not-in-force EP2833475B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TW102214212U TWM466367U (zh) 2013-07-29 2013-07-29 偶極天線

Publications (2)

Publication Number Publication Date
EP2833475A1 EP2833475A1 (fr) 2015-02-04
EP2833475B1 true EP2833475B1 (fr) 2016-05-04

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ID=49993187

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14167338.4A Not-in-force EP2833475B1 (fr) 2013-07-29 2014-05-07 Antenne dipôle

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EP (1) EP2833475B1 (fr)
ES (1) ES2582383T3 (fr)
TW (1) TWM466367U (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI530020B (zh) * 2014-07-17 2016-04-11 鋐寶科技股份有限公司 天線系統
TWM499663U (zh) * 2014-12-12 2015-04-21 Compal Broadband Networks Inc 偶極天線
CN106169648A (zh) * 2016-08-09 2016-11-30 深圳前海科蓝通信有限公司 一种天线及所述天线的电倾角调节方法
CN106876983A (zh) * 2017-03-03 2017-06-20 深圳市共进电子股份有限公司 无线通信设备及其双频天线
TW201907618A (zh) * 2017-07-04 2019-02-16 智易科技股份有限公司 偶極天線
CN118399069A (zh) * 2024-06-24 2024-07-26 中兴通讯股份有限公司 全向天线及通信设备

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7180461B2 (en) * 2004-10-15 2007-02-20 Cushcraft Corporation Wideband omnidirectional antenna
JP4794974B2 (ja) * 2005-10-19 2011-10-19 富士通株式会社 タグアンテナ，これを用いるタグ及びｒｆｉｄシステム。
TWI326942B (en) * 2007-01-18 2010-07-01 Univ Nat Sun Yat Sen Ultra-wideband shorted dipole antenna

Also Published As

Publication number Publication date
EP2833475A1 (fr) 2015-02-04
TWM466367U (zh) 2013-11-21
ES2582383T3 (es) 2016-09-12

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