EP1696508A1 - Cable antenna structure - Google Patents
Cable antenna structure Download PDFInfo
- Publication number
- EP1696508A1 EP1696508A1 EP05004341A EP05004341A EP1696508A1 EP 1696508 A1 EP1696508 A1 EP 1696508A1 EP 05004341 A EP05004341 A EP 05004341A EP 05004341 A EP05004341 A EP 05004341A EP 1696508 A1 EP1696508 A1 EP 1696508A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- antenna apparatus
- radiation unit
- sidewall
- coaxial cable
- fixing plate
- 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.)
- Withdrawn
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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
- H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
Definitions
- the present invention relates to a cable antenna apparatus, and more particularly, to a cable antenna apparatus constructed by the same coaxial cable.
- the IC technology is also developed with fast pace to provide a product with smaller size and lighter weight.
- the volume fact is one of important considerations to the antenna used for transmitting and receiving signal.
- One goal of the manufacture is to achieve the small product with light weight.
- Antenna is employed to transmit or receive EM wave.
- the characters of the antenna can be obtained from the operating frequency, radiation pattern, return loss and antenna Gain. Small size, good performance and low cost are the most important facts for the current antenna to share larger marketing.
- the well-known 2.4GHz omni-directional antenna mainly involves the so-called sleeve antenna structure or spring structure antenna.
- both of the systems are too huge, it is unlikely to achieve the size reduction purpose and can not be adapted to the wireless USB adaptor that are configured in small space.
- the signal feeding end of the antenna needs additional control IC to adjust the impedance match.
- the design of the apparatus is complicated, thereby increasing the manufacture cost.
- the object of the present invention is to provide a cable antenna with smaller size, lighter weight, and with the omni-directional capability
- the antenna apparatus comprises a coaxial cable having a core conductive wire for feeding signal, a radiation unit coupled to the coaxial cable, wherein the material and character of the radiation unit is substantially the same with the one of the coaxial cable, wherein the length of the radiation unit is approximately ((1/4) + n) ⁇ of an operation frequency of the antenna apparatus, wherein the n is an integer number that is greater than or equal to zero.
- the antenna apparatus further comprises a fixing plate having a pair of sidewalls consisting of a first sidewall facing to a third sidewall, and a pair of sidewalls consisting of a second sidewall facing to a forth sidewall A core wire pad is located adjacent to the second sidewall and a ground pad is located adjacent to the first sidewall, wherein one end of the radiation unit is fixed and electrically coupled to the core wire pad, the other end of the radiation unit is connected on the ground pad.
- the shape of the fixing plate is substantially square.
- the wide of the square fixing plate is set approximately between ((1/6) + (n/2)) ⁇ and ((1/4) + (n/2)) ⁇ of the operation frequency, wherein the n is an integer number that is greater than or equal to zero.
- the length of the square fixing plate is configured approximately between ((1/12) + (n/2)) ⁇ and ((1/8) + (n/2)) ⁇ of the operation frequency, wherein the n is an integer number that is greater than or equal to zero.
- the fixing plate includes PCB.
- the ground plate is located at the substantially mid position of the first sidewall.
- the radiation unit is electrically coupled to the core wire pad by welding, and the radiation unit is electrically coupled the ground pad by welding.
- the length of the coaxial cable is about ((1/4) + n) ⁇ of the operation frequency, and the n is an integer number that is greater than or equal to zero.
- Figure 1A and 1B illustrate the configuration of the cable antenna according to the present invention.
- FIG. 2 illustrates the SWR (standing wave ratio) according to the present invention.
- Figure 3A illustrates the x-z radiation pattern under 2.40 GHz operation.frequency according to the present invention.
- Figure 3B illustrates the x-z radiation pattern under 2.45 GHz operation frequency according to the present invention.
- Figure 3C illustrates the x-z radiation pattern under 2.50 GHz operation frequency according to the present invention.
- the coaxial cable is constructed by a core conductive wire (such as copper, copper plate with zinc or steel) wrapped by an inner insulator (such as polyethylene), external conductive wire and external insulator.
- a core conductive wire such as copper, copper plate with zinc or steel
- an inner insulator such as polyethylene
- external conductive wire such as polyethylene
- One aspect of the present invention is to provide a coaxial cable and to remove a part of the inner insulator, the external conductive wire and the external insulator, thereby exposing a part of the core conductive wire to act as an antenna.
- the antenna includes a fixing plate 200, a core wire conductive pad 220, a ground welding pad 210, a coaxial cable 120 having a core conductive wire 100 and a radiation unit 110.
- the coaxial cable 120 acts as the feeding or input point of the antenna.
- the radiation unit 110 is electrically coupled to the core conductive wire 100 of the coaxial cable 120.
- the character and material of the radiation unit 110 is substantially the same with the one of the core conductive wire 100 of the coaxial cable 120.
- radiation unit 110 could be regard as the extension of the core conductive wire 100.
- the radiation unit 110 and the core conductive wire 100 could be formed by the identical coaxial cable (for example: 50 ⁇ coaxial cable).
- the radiation unit 110 removes a part of the inner insulator, the external conductive wire and the external insulator, and the remaining conductive wire is referred as the radiation unit 110.
- the length of the radiation unit 110 is about (1/4) ⁇ of the operation frequency and the length of the coaxial cable 120 is about (1/4) ⁇ of the operation frequency. Further, the length of the coaxial cable 120 could be longer than the (1/4) ⁇ , for example, ((1/4) + n) ⁇ , wherein n is an integer number that is larger than or equal to zero.
- the preferred operation frequency of the antenna is about 2.45GHz.
- the fixing plate 200 includes a pair of sidewalls consisting of a first sidewall 212 facing to a third sidewall 232, and a pair of sidewalls consisting of a second sidewall 222 facing to a forth sidewall 242.
- the core wire welding pad 220 is adjacent to the second sidewall 222, and the ground welding pad 210 is located at the position (middle position) adjacent to the first sidewall 212.
- the fixing plate 200 could be PCB, and the shape could be circle, ellipse or the like. It well-known in the art, other shape and dimension could be used.
- the wide of the square fixing plate 200 is set approximately between ((1/6) + (n/2)) ⁇ and ((1/4) + (n/2)) A of the operation frequency while the length of the square fixing plate 200 is configured approximately between ((1/12) + (n/2)) ⁇ and ((1/8) + (n/2)) ⁇ of the operation frequency.
- One end of the radiation unit 10 is fixed and electrically coupled to the wire conductive pad 220 by welding.
- the other end of the radiation unit 110 is welded on the ground pad 210. It should be noted that other method could be employed to fix the radiation unit 10 on the pads 210 and 220.
- a gap (not shown) could be set between the third sidewall 232 and the forth sidewall 242 for engaging the radiation unit (bare core wire) 110 on the fixing plate 200.
- the present invention employs the identical coaxial cable to act the antenna.
- the feeding wire and the radiation unit 110 are constructed by the identical cable. Therefore, the impedance match circuit is no need for the feeding terminal, thereby reducing the design and manufacture cost and obtaining perfect impedance match. As aforementioned, the present invention may minimize the size of the antenna with cheaper cost, simpler process.
- FIG 2 it shows the standing wave ratio data of the present invention.
- the standing wave ratio is around 1:1.6094 while the operation frequency is about 2.4GHz (operation point O1) .
- the operation frequency is approximately 2.45GHz (operation point O2)
- the standing wave ratio is around 1:1.1265.
- the operation frequency is approximately 2.5GHz (operation point 03)
- the standing wave ratio 1:1.4792. If taking the line Ls of the standing wave ratio 1:1.7 as the base line, the operation point O1, 02 and 03 are all lower than the Ls, therefore, the 100 MHz bandwidth could be achieved under the operation frequency 2.45GHz.
- 3A illustrates the x-z radiation pattern under operation frequency 2.40 GHz according to the present invention.
- 3C illustrates the x-z radiation pattern under operation frequency 2.50 GHz according to the present invention.
- the approximate circle x-z radiation pattern could be achieved under the operation frequency 2.40GHz, 2.45GHz and 2.50GHz.
- the omni-directional antenna system could be obtained by the present invention.
- the benefit of the antenna includes simple structure, small size, low cost and omni-direction. No impedance match circuit is needed, thereby significantly reducing the manufacture cost.
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- Waveguide Aerials (AREA)
Abstract
Description
- The present invention relates to a cable antenna apparatus, and more particularly, to a cable antenna apparatus constructed by the same coaxial cable.
- Various types of antennas are rapidly improved along with the development of the communication technology. The IC technology is also developed with fast pace to provide a product with smaller size and lighter weight. The volume fact is one of important considerations to the antenna used for transmitting and receiving signal. One goal of the manufacture is to achieve the small product with light weight.
- Antenna is employed to transmit or receive EM wave. The characters of the antenna can be obtained from the operating frequency, radiation pattern, return loss and antenna Gain. Small size, good performance and low cost are the most important facts for the current antenna to share larger marketing.
- Typically, the well-known 2.4GHz omni-directional antenna mainly involves the so-called sleeve antenna structure or spring structure antenna. However, both of the systems are too huge, it is unlikely to achieve the size reduction purpose and can not be adapted to the wireless USB adaptor that are configured in small space. On the other hand, the signal feeding end of the antenna needs additional control IC to adjust the impedance match. The design of the apparatus is complicated, thereby increasing the manufacture cost.
- Thus, what is desired is to develop a cable type antenna to provide a product with smaller size, lighter weight, and with the omni-directional capability for achieving the reduction purpose. No additional impedance match circuit is needed.
- The object of the present invention is to provide a cable antenna with smaller size, lighter weight, and with the omni-directional capability
- The antenna apparatus comprises a coaxial cable having a core conductive wire for feeding signal, a radiation unit coupled to the coaxial cable, wherein the material and character of the radiation unit is substantially the same with the one of the coaxial cable, wherein the length of the radiation unit is approximately ((1/4) + n) λ of an operation frequency of the antenna apparatus, wherein the n is an integer number that is greater than or equal to zero. The antenna apparatus further comprises a fixing plate having a pair of sidewalls consisting of a first sidewall facing to a third sidewall, and a pair of sidewalls consisting of a second sidewall facing to a forth sidewall A core wire pad is located adjacent to the second sidewall and a ground pad is located adjacent to the first sidewall, wherein one end of the radiation unit is fixed and electrically coupled to the core wire pad, the other end of the radiation unit is connected on the ground pad.
- The shape of the fixing plate is substantially square. The wide of the square fixing plate is set approximately between ((1/6) + (n/2)) λ and ((1/4) + (n/2)) λ of the operation frequency, wherein the n is an integer number that is greater than or equal to zero. The length of the square fixing plate is configured approximately between ((1/12) + (n/2)) λ and ((1/8) + (n/2)) λ of the operation frequency, wherein the n is an integer number that is greater than or equal to zero. The fixing plate includes PCB. The ground plate is located at the substantially mid position of the first sidewall. The radiation unit is electrically coupled to the core wire pad by welding, and the radiation unit is electrically coupled the ground pad by welding. Wherein the length of the coaxial cable is about ((1/4) + n) λ of the operation frequency, and the n is an integer number that is greater than or equal to zero.
- Figure 1A and 1B illustrate the configuration of the cable antenna according to the present invention.
- Figure 2 illustrates the SWR (standing wave ratio) according to the present invention.
- Figure 3A illustrates the x-z radiation pattern under 2.40 GHz operation.frequency according to the present invention.
- Figure 3B illustrates the x-z radiation pattern under 2.45 GHz operation frequency according to the present invention.
- Figure 3C illustrates the x-z radiation pattern under 2.50 GHz operation frequency according to the present invention.
- Typically, the coaxial cable is constructed by a core conductive wire (such as copper, copper plate with zinc or steel) wrapped by an inner insulator (such as polyethylene), external conductive wire and external insulator. One aspect of the present invention is to provide a coaxial cable and to remove a part of the inner insulator, the external conductive wire and the external insulator, thereby exposing a part of the core conductive wire to act as an antenna.
- Please refer to figure 1A and 1B, they illustrate the preferred embodiment of the present invention. The antenna includes a
fixing plate 200, a core wireconductive pad 220, aground welding pad 210, acoaxial cable 120 having a coreconductive wire 100 and aradiation unit 110. Thecoaxial cable 120 acts as the feeding or input point of the antenna. Theradiation unit 110 is electrically coupled to the coreconductive wire 100 of thecoaxial cable 120. The character and material of theradiation unit 110 is substantially the same with the one of the coreconductive wire 100 of thecoaxial cable 120. In one aspect,radiation unit 110 could be regard as the extension of the coreconductive wire 100. Namely, theradiation unit 110 and the coreconductive wire 100 could be formed by the identical coaxial cable (for example: 50Ω coaxial cable). Theradiation unit 110 removes a part of the inner insulator, the external conductive wire and the external insulator, and the remaining conductive wire is referred as theradiation unit 110. The length of theradiation unit 110 is about (1/4) λ of the operation frequency and the length of thecoaxial cable 120 is about (1/4) λ of the operation frequency. Further, the length of thecoaxial cable 120 could be longer than the (1/4) λ, for example, ((1/4) + n) λ, wherein n is an integer number that is larger than or equal to zero. The preferred operation frequency of the antenna is about 2.45GHz. - As shown in the figure 1A and 1B, the
fixing plate 200 includes a pair of sidewalls consisting of afirst sidewall 212 facing to athird sidewall 232, and a pair of sidewalls consisting of asecond sidewall 222 facing to a forthsidewall 242. The corewire welding pad 220 is adjacent to thesecond sidewall 222, and theground welding pad 210 is located at the position (middle position) adjacent to thefirst sidewall 212. Thefixing plate 200 could be PCB, and the shape could be circle, ellipse or the like. It well-known in the art, other shape and dimension could be used. The wide of thesquare fixing plate 200 is set approximately between ((1/6) + (n/2)) λ and ((1/4) + (n/2)) A of the operation frequency while the length of thesquare fixing plate 200 is configured approximately between ((1/12) + (n/2)) λ and ((1/8) + (n/2)) λ of the operation frequency. One end of theradiation unit 10 is fixed and electrically coupled to the wireconductive pad 220 by welding. The other end of theradiation unit 110 is welded on theground pad 210. It should be noted that other method could be employed to fix theradiation unit 10 on thepads third sidewall 232 and the forthsidewall 242 for engaging the radiation unit (bare core wire) 110 on thefixing plate 200. - It should be note that the present invention employs the identical coaxial cable to act the antenna. The feeding wire and the
radiation unit 110 are constructed by the identical cable. Therefore, the impedance match circuit is no need for the feeding terminal, thereby reducing the design and manufacture cost and obtaining perfect impedance match. As aforementioned, the present invention may minimize the size of the antenna with cheaper cost, simpler process. - Please refer to figure 2, it shows the standing wave ratio data of the present invention. The standing wave ratio is around 1:1.6094 while the operation frequency is about 2.4GHz (operation point O1) . When the operation frequency is approximately 2.45GHz (operation point O2), the standing wave ratio is around 1:1.1265. Similarly, when the operation frequency is approximately 2.5GHz (operation point 03), the standing wave ratio 1:1.4792. If taking the line Ls of the standing wave ratio 1:1.7 as the base line, the operation point O1, 02 and 03 are all lower than the Ls, therefore, the 100 MHz bandwidth could be achieved under the operation frequency 2.45GHz.
- Please refer to figure 3A to 3C, 3A illustrates the x-z radiation pattern under operation frequency 2.40 GHz according to the present invention. Similarly, 3C illustrates the x-z radiation pattern under operation frequency 2.50 GHz according to the present invention. From figure 3A to 3C, the approximate circle x-z radiation pattern could be achieved under the operation frequency 2.40GHz, 2.45GHz and 2.50GHz. To phrase another words, the omni-directional antenna system could be obtained by the present invention.
- The benefit of the antenna includes simple structure, small size, low cost and omni-direction. No impedance match circuit is needed, thereby significantly reducing the manufacture cost.
- Although specific embodiments have been illustrated and described, it will be obvious to those skilled in the art that various modifications may be made without departing from what is intended to be limited solely by the appended claims.
Claims (21)
- An antenna apparatus comprising:a coaxial cable having a core conductive wire for feeding signal; anda radiation unit coupled to said coaxial cable,wherein the material and character of said radiation unit is substantially the same with the one of said coaxial cable, wherein the length of said radiation unit is approximately ((1/4) + n) λ of an operation frequency of said antenna apparatus, wherein said n is an integer number that is greater than or equal to zero.
- The antenna apparatus of claim1, further comprising:a fixing plate having a pair of sidewalls consisting of a first sidewall facing to a third sidewall, and a pair of sidewalls consisting of a second sidewall facing to a forth sidewall;a core wire pad located adjacent to said second sidewall;a ground pad located adjacent to said first sidewall, wherein one end of said radiation unit is fixed and electrically coupled to said core wire pad, the other end of said radiation unit is connected on said ground pad.
- The antenna apparatus of claim 2, wherein the shape of said fixing plate is square.
- The antenna apparatus of claim 3, wherein the wide of said square fixing plate is set approximately between ((1/6) + (n/2)) λ and ((1/4) + (n/2)) λ of said operation frequency, wherein said n is an integer number that is greater than or equal to zero.
- The antenna apparatus of claim 3, wherein the length of the square fixing plate is configured approximately between ((1/12) + (n/2)) λ and ((1/8) + (n/2)) λ of said operation frequency, wherein said n is an integer number that is greater than or equal to zero.
- The antenna apparatus of claim 2, wherein said fixing plate includes PCB.
- The antenna apparatus of claim 2, wherein said ground plate is located at the substantially mid position of said first sidewall.
- The antenna apparatus of claim 2, wherein said radiation unit is electrically coupled to said core wire pad by welding.
- The antenna apparatus of claim 2, wherein said radiation unit is electrically coupled said ground pad by welding.
- The antenna apparatus of claim 1, wherein the length of said coaxial cable is about ((1/4) + n) λ of said operation frequency, wherein said n is an integer number that is greater than or equal to zero.
- The antenna apparatus of claim 1, wherein said radiation unit is the extension of said coaxial cable.
- An antenna apparatus, comprising:a fixing plate having a pair of sidewalls consisting of a first sidewall facing to a third sidewall, and a pair of sidewalls consisting of a second sidewall facing to a forth sidewall;a core wire pad located adjacent to said second sidewall;a ground pad located adjacent to said first sidewall;a coaxial cable having a core conductive wire for feeding signal; anda radiation unit coupled to said coaxial cable,wherein the material and character of said radiation unit is substantially the same with the one of said coaxial cable, wherein one end of said radiation unit is fixed and electrically coupled to said core wire pad, the other end of said radiation unit is connected on said ground pad;
wherein the length of said radiation unit is approximately ((1/4) + n) λ of an operation frequency of said antenna apparatus, wherein said n is an integer number that is greater than or equal to zero. - The antenna apparatus of claim 12, wherein the shape of said fixing plate is square.
- The antenna apparatus of claim 13, wherein the wide of said square fixing plate is set approximately between ((1/6) + (n/2)) λ and ((1/4) + (n/2)) λ of said operation frequency, wherein said n is an integer number that is greater than or equal to zero.
- The antenna apparatus of claim 13, wherein the length of the square fixing plate is configured approximately between ((1/12) + (n/2)) λ and ((1/8) + (n/2)) λ of said operation frequency, wherein said n is an integer number that is greater than or equal to zero.
- The antenna apparatus of claim 12, wherein said fixing plate includes PCB.
- The antenna apparatus of claim 12, wherein said ground plate is located at the substantially mid position of said first sidewall.
- The antenna apparatus of claim 12, wherein said radiation unit is electrically coupled to said core wire pad by welding.
- The antenna apparatus of claim 12, wherein said radiation unit is electrically coupled said ground pad by welding.
- The antenna apparatus of claim 12, wherein the length of said coaxial cable is about ((1/4) + n) λ of said operation frequency, wherein said n is an integer number that is greater than or equal to zero.
- The antenna apparatus of claim 12, wherein said radiation unit is the extension of said coaxial cable.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05004341A EP1696508A1 (en) | 2005-02-28 | 2005-02-28 | Cable antenna structure |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05004341A EP1696508A1 (en) | 2005-02-28 | 2005-02-28 | Cable antenna structure |
Publications (1)
Publication Number | Publication Date |
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EP1696508A1 true EP1696508A1 (en) | 2006-08-30 |
Family
ID=34933980
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP05004341A Withdrawn EP1696508A1 (en) | 2005-02-28 | 2005-02-28 | Cable antenna structure |
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EP (1) | EP1696508A1 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4321233A1 (en) * | 1992-11-03 | 1994-05-05 | Siemens Ag | Half wave antenna esp. for mobile radio - has coaxial supply line arrangement with aerial proper formed by screen element and inner conductor |
WO1998010485A1 (en) * | 1996-09-05 | 1998-03-12 | Ericsson Inc. | Coaxial dual-band antenna |
DE19726570C1 (en) * | 1997-06-23 | 1998-12-24 | Retronika Ges Fuer Telekommuni | Dipole antenna for radio telephones |
US20020175804A1 (en) * | 2001-05-22 | 2002-11-28 | Takeshi Saito | Interrogator and goods management system adopting the same |
-
2005
- 2005-02-28 EP EP05004341A patent/EP1696508A1/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4321233A1 (en) * | 1992-11-03 | 1994-05-05 | Siemens Ag | Half wave antenna esp. for mobile radio - has coaxial supply line arrangement with aerial proper formed by screen element and inner conductor |
WO1998010485A1 (en) * | 1996-09-05 | 1998-03-12 | Ericsson Inc. | Coaxial dual-band antenna |
DE19726570C1 (en) * | 1997-06-23 | 1998-12-24 | Retronika Ges Fuer Telekommuni | Dipole antenna for radio telephones |
US20020175804A1 (en) * | 2001-05-22 | 2002-11-28 | Takeshi Saito | Interrogator and goods management system adopting the same |
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