EP2833475A1 - Dipole antenna - Google Patents
Dipole antenna Download PDFInfo
- Publication number
- EP2833475A1 EP2833475A1 EP20140167338 EP14167338A EP2833475A1 EP 2833475 A1 EP2833475 A1 EP 2833475A1 EP 20140167338 EP20140167338 EP 20140167338 EP 14167338 A EP14167338 A EP 14167338A EP 2833475 A1 EP2833475 A1 EP 2833475A1
- 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.)
- Granted
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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
Abstract
Description
- 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.
- With the evolving technology to the wireless communications, the modern electronic products such as laptop, Personal Digital Assistant (PDA), wireless LAN, mobile phone, smart meter, and USB dongle are able to communicate wirelessly, for example, through the WiFi technology to replace the physical cable for data transmission or receiving. 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. Besides, the trend of the antenna dimension is getting smaller to accommodate with the same interests, i.e., smaller dimension, of electronic products.
-
Figure 1 illustrates a schematic diagram of aconventional dipole antenna 10. Theconventional dipole antenna 10 comprisesradiating elements coaxial transmission line 104. Theradiating elements coaxial transmission line 104, respectively. Thedipole antenna 10 is not required to connect to a ground plane so that it is insensitive to environmental stimuli. However, the dimension of thedipole antenna 10 is relatively large. The total length of thedipole antenna 10 is about half of the wave length (λ/2), which means thedipole antenna 10 goes larger when the operating frequency is lowered. Therefore, theconventional dipole antenna 10 is mostly used as an external antenna. However, electronic products with an external antenna do not seem to be stylish, so it lowers the customers' desire to purchase the products. Moreover, thedipole 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. - In the prior art, 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. In such antenna design, however, 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. As a result, the antenna gain and the antenna efficiency are reduced. Moreover, 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. Besides, 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. However, 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.
- Therefore, it is a common goal in the industry to provide a relative small sized, multi-band supported, efficient, and cost effective antenna.
- 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.
- This is achieved by a dipole antenna according to
claim 1. The dependent claims pertain to corresponding further developments and improvements. - As will be seen more clearly from the detailed description as follows, the claimed dipole antenna comprises a dielectric substrate which presents as a horizontal plane; a first radiating element formed on the dielectric substrate, having a first bent portion and a second bent portion; a second radiating element formed on the dielectric substrate and having a third bent portion and a fourth bent portion; a feed-in gap, spaces out the first radiating element and the second radiating element, is located between the first radiating element and the second radiating element; a first feed-in point located between the first bent portion and the second bent portion; and a second feed-in point located between the third bent portion and the fourth bent portion; wherein the first radiating element and the second radiating element are disposed side-by-side horizontally across the dielectric substrate, and wherein the first feed-in point and the second feed-in point are spaced out by the feed-in gap.
-
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Figure 1 is a schematic diagram of a conventional dipole antenna -
Figure 2 is a schematic diagram of a dipole antenna according to an embodiment of the present invention. -
Figure 3 illustrates a resonant path of the low frequency current in the dipole antenna shown inFigure 2 . -
Figure 4 illustrates a resonant path of the high frequency current in the dipole antenna shown inFigure 2 . -
Figure 5 illustrates the reflection coefficient of the dipole antenna shown inFigure 2 . -
Figure 6 illustrates the radiation pattern of the dipole antenna shown inFigure 2 operating in 2.45GHz. -
Figure 7 illustrates the radiation pattern of the dipole antenna shown inFigure 2 operating in 5.15GHz. -
Figure 8 illustrates the radiation pattern of the dipole antenna shown inFigure 2 operating in 5.55GHz. -
Figure 9 illustrates the radiation pattern of the dipole antenna shown inFigure 2 operating in 5.85GHz. -
Figure 10 shows the antenna gain and the radiation efficiency of the dipole antenna shown inFigure 2 operating between 2.4GHz and 5.85GHz. -
Figure 11 shows a diagram of antenna power loss versus throughput of wireless local area network communication system when the dipole antenna shown inFigure 2 operates between 2.4GHz and 5GHz. -
Figure 2 is a schematic diagram of adipole antenna 20 according to an embodiment of the present invention. Thedipole antenna 20 includes adielectric substrate 200 which presents as a plane,radiating elements gap 206, and feed-inpoints radiating elements dielectric substrate 200 havebent portions bent portions radiating elements dielectric substrate 200, and are spaced out by a feed-ingap 206. The feed-in points radiating elements point 208 is substantially located at the middle point between thebent portion 2020 and thebent portion 2022, while the feed-inpoint 210 is substantially located at the middle point between thebent portion 2040 and thebent portion 2042. The spacing between the feed-inpoints gap 206. - As shown in
Figure 2 , the top half A1 and the bottom half B1 of theradiating element 202 are not symmetric. Similarly, the top half A2 and bottom half B2 of theradiating 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 theradiation elements radiating element 202 and the secondradiating element 204 are symmetric horizontally along substantially the center point of the feed-ingap 206, i.e., the orientation of the firstradiating element 202 is a 180 degree transposition from the secondradiating 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 thedipole antenna 20, respectively. Thedipole 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 theradiating element 202 to the bottom half segment B2 of theradiating element 204 via the feed-ingap 206. With proper positioning to thebent portion 2022 and thebent portion 2042, thedipole 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 0.51λ), thedipole antenna 20 may resonate in a 2.4GHz frequency band. The other current resonant path flows from the top half segment A2 of theradiating element 204 to the bottom half segment B1 of theradiating element 202 via the feed-ingap 206. With proper positioning to thebent portion 2020 and thebent portion 2040, thedipole 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 0.46λ), thedipole antenna 20 may resonate in a 5GHz frequency band. In an example, thedipole 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, thedipole antenna 20 may be fully contained in a narrow space as 45 x 13 mm2. - The
dipole antenna 20 of the present invention uses thebent portions dipole antenna 20 may support multiple operating frequency bands in a minimized dimension compared to the conventional dipole antennas. Those skilled in the art can readily make modifications and/or alterations accordingly. For example, the radiatingelement 202 and theradiating element 204 may be disposed on thedielectric substrate 200 by printing and etching processes. Thedielectric 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. In addition, the dimension of the radiatingelements - The outward corner not facing to the gravity center of the
radiation elements bent portions bent portions Figure 2 , the radiatingelements bent portions dipole antenna 20. Furthermore, the inward corner facing the gravity center of theradiation elements bent portions element 202 and theradiating element 204 may be symmetric in accordance to the center point of the feed-inpoint 208 and feed-inpoint 210. Alternatively, the dipole antenna may be asymmetric according to the practical consideration of the antenna design. - Since the feed-in
gap 206 of thedipole antenna 20 is electrically equivalent to a capacitance, the impedance matching of thedipole antenna 20 can be effectively improved by properly adjusting the spacing of the feed-in gap in order to increase the radiation efficiency.Figure 5 shows the reflection coefficient of thedipole antenna 20 shown inFigure 2 . The line with triangle markers represents the reflection coefficient of theconventional dipole antenna 10, the line with square markers represents a simulation result of the reflection coefficient for thedipole antenna 20, and the line with circle markers represents a measurement result of the reflection coefficient for thedipole antenna 20. Since the feed-ingap 206 is adjustable, thedipole 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) is a 180 degree transposition of the right portion (i.e., the radiating elements 204); therefore, 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 thedipole antenna 20 operating in 2.45GHz, 5.15GHz, 5.55GHz, and 5.85GHz, respectively. The geometric structure of thedipole 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 thedipole antenna 20 operating between 2.4GHz and 5.85GHz. When thedipole antenna 20 operates near the 2.4GHz frequency band, the antenna gain is about 1.85 dBi while the radiation efficiency is about 97%. When thedipole antenna 20 operates near the 5GHz frequency band, 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 thedipole antenna 20 operates between 2.4GHz and 5GHz. As can be seen fromFigure 11 , the WLAN communication system equipped with thedipole antenna 20 has a favorable data throughput. - In summary, 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. In addition, the space required for disposing the dipole antenna is effectively reduced in the present invention, which benefits implementation of embedded antenna. Moreover, 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.
Claims (10)
- A dipole antenna (20) characterized by comprising:a dielectric substrate (200);a first radiating element (202) formed on the dielectric substrate (200) having a first bent portion (2020) and a second bent portion (2022);a second radiating element (204) formed on the dielectric substrate (200) having a third bent portion (2040) and a fourth bent portion (2042);a feed-in gap (206) located between the first radiating element (202) and the second radiating element (204) spaces out the first radiating element (202) and the second radiating element (204);a first feed-in point (208) located between the first bent portion (2020) and the second bent portion (2022); anda second feed-in point (210) located between the third bent portion (2040) and the fourth bent portion (2042);wherein the first radiating element (202) and the second radiating element (204) are disposed side-by-side horizontally across the dielectric substrate (200) and wherein the first feed-in point (208) and the second feed-in point (210) are spaced out by the feed-in gap.
- The dipole antenna (20) of claim 1, characterized in that the first bent portion (2020), the second bent portion (2022), the third bent portion (2040) and/or the fourth bent portion (2042) form a corner facing the gravity center of the radiation elements (202, 204) which is a right angle and form a corner not facing to the gravity center of the radiation elements (202, 204) which is an oblique angle.
- The dipole antenna (20) of claim 2 wherein the path width of the corners formed by the bent portions (2020, 2022, 2040, 2042) is not uniform.
- The dipole antenna (20) of any of claims 1 to 3, characterized in that a top half portion and a bottom half portion of the first radiating element (202) and the second radiating element (204) are not symmetric, 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 dipole antenna (20) of any of claims 1 to 3, characterized in that 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), and the orientation of the first radiating element (202) is a 180 degree transposing to the second radiating element (204).
- The dipole antenna (20) of any of claims 1-5, characterized in that the first radiating element (202) further has a fifth bent portion (2024), and the second radiating element further has a sixth bent portion (2044).
- The dipole antenna (20) of any of claims 1-6, characterized in that the dielectric substrate (200) conforms to FR4 specifications.
- The dipole antenna (20) of any of claims 1-7, characterized in that the dipole antenna (20) does not contain any via.
- The dipole antenna (20) of claim 1, characterized in that the first feed-in point (208) and the second feed-in point (210) are connected to a central conductor and an outer grounded conductor of a coaxial cable, respectively.
- The dipole antenna (20) of claim 1, characterized in that the first radiating element (202) and the second radiating element (204) are disposed on the dielectric substrate (200) by printing and etching processes.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW102214212U TWM466367U (en) | 2013-07-29 | 2013-07-29 | Dipole antenna |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2833475A1 true EP2833475A1 (en) | 2015-02-04 |
EP2833475B1 EP2833475B1 (en) | 2016-05-04 |
Family
ID=49993187
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14167338.4A Not-in-force EP2833475B1 (en) | 2013-07-29 | 2014-05-07 | Dipole antenna |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2833475B1 (en) |
ES (1) | ES2582383T3 (en) |
TW (1) | TWM466367U (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3032644A1 (en) * | 2014-12-12 | 2016-06-15 | Compal Broadband Networks Inc. | Dipole antenna |
CN106169648A (en) * | 2016-08-09 | 2016-11-30 | 深圳前海科蓝通信有限公司 | A kind of electrical tilt control method of antenna and described antenna |
CN106876983A (en) * | 2017-03-03 | 2017-06-20 | 深圳市共进电子股份有限公司 | Wireless Telecom Equipment and its dual-band antenna |
EP3425729A1 (en) * | 2017-07-04 | 2019-01-09 | Arcadyan Technology Corporation | Dipole antenna |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI530020B (en) * | 2014-07-17 | 2016-04-11 | 鋐寶科技股份有限公司 | Antenna system |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060082515A1 (en) * | 2004-10-15 | 2006-04-20 | Petropoulos Anthanasios G | Wideband omnidirectional antenna |
EP1780829A1 (en) * | 2005-10-19 | 2007-05-02 | Fujitsu Ltd. | Tag antenna, tag and RFID system using the same |
US20080174505A1 (en) * | 2007-01-18 | 2008-07-24 | National Sun Yat-Sen University | Ultra-wideband shorted dipole antenna |
-
2013
- 2013-07-29 TW TW102214212U patent/TWM466367U/en not_active IP Right Cessation
-
2014
- 2014-05-07 EP EP14167338.4A patent/EP2833475B1/en not_active Not-in-force
- 2014-05-07 ES ES14167338.4T patent/ES2582383T3/en active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060082515A1 (en) * | 2004-10-15 | 2006-04-20 | Petropoulos Anthanasios G | Wideband omnidirectional antenna |
EP1780829A1 (en) * | 2005-10-19 | 2007-05-02 | Fujitsu Ltd. | Tag antenna, tag and RFID system using the same |
US20080174505A1 (en) * | 2007-01-18 | 2008-07-24 | National Sun Yat-Sen University | Ultra-wideband shorted dipole antenna |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3032644A1 (en) * | 2014-12-12 | 2016-06-15 | Compal Broadband Networks Inc. | Dipole antenna |
CN106169648A (en) * | 2016-08-09 | 2016-11-30 | 深圳前海科蓝通信有限公司 | A kind of electrical tilt control method of antenna and described antenna |
CN106876983A (en) * | 2017-03-03 | 2017-06-20 | 深圳市共进电子股份有限公司 | Wireless Telecom Equipment and its dual-band antenna |
EP3425729A1 (en) * | 2017-07-04 | 2019-01-09 | Arcadyan Technology Corporation | Dipole antenna |
US10249954B2 (en) * | 2017-07-04 | 2019-04-02 | Arcadyan Technology Corporation | Dipole antenna |
Also Published As
Publication number | Publication date |
---|---|
EP2833475B1 (en) | 2016-05-04 |
TWM466367U (en) | 2013-11-21 |
ES2582383T3 (en) | 2016-09-12 |
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