WO2001004989A1 - Whip antenna and method of producing the same - Google Patents
Whip antenna and method of producing the same Download PDFInfo
- Publication number
- WO2001004989A1 WO2001004989A1 PCT/JP1999/003767 JP9903767W WO0104989A1 WO 2001004989 A1 WO2001004989 A1 WO 2001004989A1 JP 9903767 W JP9903767 W JP 9903767W WO 0104989 A1 WO0104989 A1 WO 0104989A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- antenna
- sleeve
- whip
- cavity
- antenna element
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q11/00—Electrically-long antennas having dimensions more than twice the shortest operating wavelength and consisting of conductive active radiating elements
- H01Q11/02—Non-resonant antennas, e.g. travelling-wave antenna
- H01Q11/08—Helical antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
- H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
- H01Q1/244—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas extendable from a housing along a given path
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
-
- 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
- H01Q9/32—Vertical arrangement of element
- H01Q9/36—Vertical arrangement of element with top loading
Definitions
- This invention relates to a whip antenna equipped in a communication apparatus such as a mobile radio apparatus .
- mobile radio apparatuses are provided with antennas for transmission and reception of a radio wave .
- These antennas have a wide variety of shapes . Such tendency is remarkable in mobile telephone sets.
- a light-weight and economical antenna is desired.
- use is made of a telescopic or extendable whip antenna which can be retreated or retracted in a housing of the mobile telephone set.
- a typical telescopic whip antenna comprises a first antenna portion 10 which can be retreated into a housing of a telephone set (not shown) , and a second antenna portion 20 protruding outside of the housing of the telephone set even when the first antenna portion 10 is retreated.
- the whip antenna is classified into one of an unseparate type and a separate type in which the first and the second antenna portions 10 and 20 are electrically directly connected or electrically separated, respectively.
- each of the first and the second antenna portions 10 and 20 is covered with a face protection mold.
- the first antenna portion 10 is covered by a tube made of insulating resin while the second antenna portion 20 is covered with an antenna top mold of insulating resin.
- the tube and the antenna top mold as the face protection molds are formed in different manners by the use of different techniques . Therefore , a total number of steps is increased so that a high production cost is required. This results in an increase in product price.
- the face protection mold for the first antenna portion 20 of a long size is formed by the use of a die, it is highly possible that a molding material does not uniformly spread in every corner of the die. In this event, the face protection mold will suffer an uneven thickness or a local deficiency.
- a whip antenna which comprises a first antenna portion and a second antenna portion coupled to the first antenna portion.
- the first antenna portion comprises a first antenna element and a coating portion covering the first antenna element.
- the second antenna portion comprises a conductive sleeve and a second antenna element arranged at one end of the sleeve and electrically connected to the sleeve. At least the one end of the sleeve and the second antenna element is enclosed in a mold of a resin material to form an antenna top portion.
- the coating portion is made of the same resin material as that of the mold covering at least the one end of the sleeve and the second antenna element and is integrally formed with the antenna top portion simultaneously when the mold is formed.
- a method of producing a whip antenna which comprises a first antenna portion and a second antenna portion combined with the first antenna portion.
- the first antenna portion comprises a first antenna element and a coating portion covering the first antenna element.
- the second antenna portion comprises a conductive sleeve and a second antenna element arranged at one end of the sleeve and electrically connected to the sleeve . At least the one end of the sleeve and the second antenna element being enclosed in a mold of a resin material to form an antenna top portion.
- the method comprises the steps of preparing a die having a cavity for molding the coating portion and the antenna top portion, a plurality of gates communicating with the cavity to supply a molding material in a molten state to the cavity, and an air vent communicating with the cavity to evacuate the cavity, simultaneously molding the coating portion and the antenna top portion with the molding material by filling the molding material in a molten state into the cavity through the gates while the cavity is evacuated through the air vent.
- Fig. 1 is a half-sectional view of a conventional whip antenna of an unseparate type ;
- Fig. 2 is a half-sectional view of a conventional whip antenna of a separate type
- Fig. 3 is a half-sectional view of a whip antenna according to a first embodiment of this invention.
- Fig. 4 is a perspective view of an opened state of a die used in production of the whip antenna illustrated in Fig. 3 ;
- Fig. 5 is a perspective view of a closed state of the die illustrated in Fig. 4;
- Fig. 6 is an enlarged perspective view of an example of a gate portion of the die illustrated in Fig. 4;
- Fig. 7 is an enlarged perspective view of another example of the gate portion of the die illustrated in Fig. 4 ;
- Fig. 8 is a half-sectional view of a whip antenna according to a second embodiment of this invention.
- Fig. 9 is a perspective view of a characteristic part of the whip antenna illustrated in Fig. 8.
- a first antenna portion 10 comprises a first antenna element 1 , a coating portion 9 covering the first antenna element 1 , and a conductive stopper 5 fixed to a bottom end of the first antenna element 1 and electrically connected to the first antenna element 1.
- the first antenna portion 10 is slidably inserted into a holder 4 which serves to attach the antenna to a housing (not shown) of a mobile telephone set.
- the holder 4 is fixedly attached to a top surface of the housing of the mobile telephone set.
- a second antenna portion 20 comprises a conductive sleeve 6 fixed to a top end of the first antenna element 1 and electrically connected to the first antenna element 1 , a second antenna element 2 which is a coil arranged on a top end of the sleeve 6 , and a helical guide 7 fixed to the top end of the sleeve 6 to hold the second antenna element 2.
- the second antenna portion 20 is a so-called helical antenna.
- the sleeve 6 , the second antenna element 2 , and the helical guide 7 are enclosed in a mold of electrical insulating resin material to form an antenna top 11.
- the first antenna element 1 of the first antenna portion 10 is also enclosed in a similar mold of the insulating resin material to form the coating portion 9.
- the stopper 5 formed at the bottom end of the first antenna portion 10 serves as a feeding portion for the whip antenna.
- the first antenna element 1 of the first antenna portion 10 and the second antenna element 2 of the second antenna portion 20 are energized or supplied with electric power through the stopper 5 to perform an antenna function, respectively.
- the first and the second antenna portions 10 and 20 are not separated both mechanically and electrically. Since the holder 4 fixedly attached to the housing of the mobile telephone set is not involved in energization or power supply, the holder 4 may be made of electrical insulating resin material . The first antenna portion 10 is slidably inserted into the holder 4.
- a die 30 is used.
- the die 30 comprises a lower split die 31 and an upper split die 32.
- the lower split die 31 has a plurality of cavity portions 311 , a liner portion 312 , first and second gate portions 313 and 314 , a coupling portion 315 , an air vent 316, and a rubber packing 317.
- the cavity portions 311, four in number in the illustrated example, are formed on an upper surface of the lower split die 31 in parallel to one another.
- Each of the cavity portions 311 has an under part 311a of a linear shape and a top part 311b of a generally elliptical shape.
- the under part 311a serves to form the coating portion 9 of the whip antenna while the top part 311b serves to form the antenna top 11 of the whip antenna.
- the liner portion 312 is formed on the top surface of the lower split die 31 and serves to introduce into each cavity portion 311 the insulating resin material as a molding material injected through an injection hole 321 of the upper split die 32 which will later be described.
- the liner portion 312 has one end 312a communicating with the injection hole 321 of the upper split die 32 and the other end divided into a plurality of branch portions 312b in one-to-one correspondence to the cavity portions 311.
- Each branch portion 312b extends along the top part 311b of a corresponding one of the cavity portions 311.
- Each of the first gate portions 313 establishes communication between the branch portion 312b of the liner portion 312 and the top part 311b of the cavity portion 311 to introduce the insulating resin material in a molten state from the liner portion 312 into the top part 311b.
- the first gate portion 313 has a semiconical shape obtained by splitting a cone in a longitudinal direction.
- Each of the second gate portions 314 establishes communication between the branch portion 312b of the liner portion 312 and the under part 311a of the cavity portion 311 to introduce the insulating resin material in a molten state from the liner portion 312 into the under part 311a.
- the second gate portion 314b has a semiconical shape similar to that of the first gate portion 313.
- each of the first and the second gate portions 313 and 314 may have a semiprismal shape obtained by splitting a prism in a longitudinal direction.
- the coupling portion 315 has a trunk part 315a and four branch parts 315b extending from the trunk part 315a.
- the branch part 315b communicates with the cavity portions 311, respectively.
- the four cavity portions 311 are spatially combined by the coupling portion 315b.
- the air vent 316 has one end communicating with the coupling portion 315 and the other end opened on a side surface of the lower split die 31.
- the rubber packing 317 serves to seal a gap between the lower and the upper split dies 31 and 32 and is arranged at a peripheral zone of the upper surface of the lower split die 31 to surround the cavity portions 311 , the liner portion 312 , the first and the second gate portions 313 and 314 , and the coupling portion 315.
- the upper split 32 die is also provided on its lower surface with a plurality of cavity portions, a liner portion, first and second gate portions , and a coupling portion in the manner similar to the lower split die 31. These portions are identical in shape with the cavity portion 311 , the liner portion 312 , the first and the second gate portions 313 and 314 , and the coupling portion 315 of the lower split die 31. Therefore, when the upper split die 32 is bonded to the lower split die 31, the cavity portions of the upper and the lower split dies 31 and 32 form a plurality of hollow cavities each of which is for molding the coating portion 9 and the antenna top 11 of the whip antenna.
- the liner portions of the upper and the lower split dies 31 and 32 form a pipe-like liner for introducing the insulating resin material in a molten state into the cavities .
- the first and the second gate portions of the upper and the lower split dies 31 and 32 form first and second gates as holes for supplying the insulating resin material in a molten state from the liner into the cavities .
- the coupling portions of the upper and the lower split dies 31 and 32 form a pipe-like communication hole for communication between the four cavities and the air vent 316.
- the upper split die 32 does not have the air vent 316 but has the injection hole 321 for injecting the insulating resin material in a molten state into the liner.
- the second antenna element 2 wound around the helical guide 7 is fixed on the top end of the sleeve 6. Simultaneously, the second antenna element 2 is electrically connected to the sleeve 6. To the bottom end of the sleeve 6 , the top end of the first antenna element 1 is inserted to form an assembly.
- the assembly is disposed in the cavity portion 311 of the lower split die 31.
- the second antenna element 2 , the helical guide 7 , and the sleeve 6 are disposed in the top part 311b of the cavity portion 311 while the first antenna element 1 is disposed in the under part 311a of the cavity portion 311.
- the cavity is evacuated through the air vent 316 by the use of a vacuum device (not shown) .
- the insulating resin material in a molten state is filled into the cavity through the injection hole 321 of the upper split die 32 to wait solidification of the insulating resin material .
- the die 30 is opened to remove a molded product from the die 30.
- the stopper 5 can be fixed by preliminarily deforming the bottom end of the first antenna element 1 and press-fitting the bottom end to the stopper 5 or by inserting the bottom end of the first antenna element 1 into the stopper 5 and then caulking the stopper 5.
- the molding material i.e., the insulating resin material
- the width of the gate is determined on the order of 0.3mm. In this event, it is easy to remove the product after the molding operation. It is preferable that the width of the gate is determined between 0.3mm and 0.6mm, taking into consideration the flowability of the insulating resin material.
- the coating portion 9 has a thickness of 0.4mm or more. It is preferable that each half side of the coating portion 9 is determined to have a thickness of 0.2mm, taking into consideration the strength and the design of the first antenna portion 10.
- the first antenna portion 10 and the sleeve 6 of the second antenna portion 20 are mechanically fixed to each other through an insulating resin portion 3. Simultaneously, the first and the second antenna portions 10 and 20 are electrically insulated from each other through the insulating resin portion 3. The bottom end of the sleeve 6 is exposed.
- the whip antenna is a so-called separate antenna in which the antenna function is performed by different antenna elements in an extended state and a retreated state , respectively.
- the first antenna element 1 is energized through the stopper 5 formed at the bottom end of the first antenna element 1 of the first antenna portion 10.
- the first antenna element 1 performs the antenna function with the stopper 5 serving as a feeding portion.
- the second antenna element 2 of the second antenna portion 20 is not energized because of presence of the insulating resin portion 3 and does not perform the antenna function.
- the second antenna element 2 is energized through the sleeve 6 as a feeding portion and performs the antenna function.
- the first antenna element 1 of the first antenna portion 10 is not energized because of presence of the insulating resin portion 3 and does not perform the antenna function.
- a die (will hereafter be called a "second die") for producing the whip antenna in Fig. 8 is substantially similar to the die (will hereafter be called a "first die") for producing the whip antenna in Fig. 3 but is slightly different as will presently be described.
- the top end of the under part 311a of the cavity portion 311 is formed so that it does not reach the sleeve 6 and is not brought into contact with the first antenna element 1.
- the top end of the under part of the cavity portion is formed so that it extends to the bottom end of the sleeve 6 and is brought into tight contact with the bottom end of the sleeve 6.
- first and the second dies are slightly different in position of the gates .
- the positions of the first and the second gates are depicted by Gl and G2 , respectively. From comparison of Figs. 3 and 8, it is obvious that the first gates are located at the same position in the first and the second dies .
- the second gate in the second die is located at a level lower than that of the second gate in the first die because of the following reason. In the second die, the top end of the under part of the cavity portion is in tight contact with the bottom end of the sleeve 6. In order to avoid the second gate from being located there, the second gate is shifted downward.
- the second die is different from the first die only in the above-mentioned respects . Therefore , upon describing the method of producing the whip antenna in Fig. 8 , reference will be made to Fig. 4 as regards the die .
- the helical guide 7 with the second antenna element 2 preliminarily wound therearound is at first fixed to the sleeve 6 by press-fitting or screwing.
- the second antenna element 2 wound around the helical guide 7 is electrically connected to the sleeve 6 to obtain the assembly.
- the assembly is disposed in the top part 311b of the cavity portion 311 formed in the lower split die 31.
- the first antenna element 1 is disposed in the under part 311a of the cavity portion 311. At this time, the top end of the first antenna element 1 is separated from the sleeve 6.
- the die 30 is closed and the cavity is evacuated through the air vent 316 by the use of the vacuum device (not shown) .
- the insulating resin material in a molten state is filled into the cavity through the injection hole 321 of the upper split die 32.
- a hollow portion 8 having a diameter on the order of 1.9mm is formed at the center of the helical guide 7 and the sleeve 6. Therefore, the insulating resin material is supplied through the hollow portion 8 and the second gate portion 311b to the under part 311a.
- the antenna top 11, the insulating resin portion 3 , and the coating portion 9 are simultaneously molded.
- the die 30 is opened to remove the molded product from the die 30.
- the holder 4 is attached and the stopper 5 is fixed to the molded product.
- the whip antenna in Fig. 8 is completed.
- Fig. 9 in addition, the description will be proceeded as regards the method of producing the whip antenna in Fig . 8.
- the helical guide 7 preliminarily formed by molding or the like is fixed to the sleeve 6 by press-fitting or screwing.
- the second antenna element 2 is wound around the helical guide 7 and electrically connected to the sleeve 6.
- the hollow portion 8 having a diameter on the order of 1.9mm is formed to flow the insulating resin material .
- the helical guide 7 with the second antenna element 2 and the sleeve 6 are inserted into a molding die together with the first antenna element 1 to carry out molding of the antenna top 11.
- the insulating resin material flows through the hollow portion 8 to simultaneously form the insulating resin portion 3 and the coating portion 9 of the first antenna element 1.
- the whip antenna in Fig. 3 can be produced through a method similar to the above-mentioned another method. It is noted here that, since the whip antenna in Fig. 3 does not have the insulating resin portion 3 , the hollow portion 8 need not be formed in the sleeve 6 and the helical guide 7. In addition, in the whip antenna in Fig. 3, a part of the sleeve 6 need not be exposed. Therefore, the second antenna element 2 , the helical guide 7 , the sleeve 6 , and the first antenna element 1 is integrally enclosed by a mold of the molding resin material A. In each of the whip antennas illustrated in Figs .
- both the antenna top 11 and the coating portion 9 (including the insulating resin portion 3 in case of the whip antenna in Fig. 8) of the first antenna element 1 are simultaneously molded. Thereafter, the holder 4 and the stopper 5 are attached to the first antenna portion 10.
- the stopper 5 is fixedly attached to the first antenna element 1 by deforming the bottom end of the first antenna element 1 and press-fitting the bottom end into the stopper 5. Alternatively, the stopper 5 may be fixed to the first antenna element 1 by caulking the stopper 5.
- the gate of the die has a circular section in a direction perpendicular to a flowing direction of the insulating resin material . It is noted here that the gate may have an elliptical or a polygonal section without being restricted to the circular section.
- the die illustrated in Fig. 4 is a split die, use may be made of a cylindrical die or a combination of a split die and a cylindrical die. In case where the cylindrical die is used, a parting line can be eliminated.
Abstract
Description
Claims
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP00783198A JP3163480B2 (en) | 1998-01-19 | 1998-01-19 | Whip antenna and manufacturing method thereof |
CN99810849A CN1318214A (en) | 1998-01-19 | 1999-07-13 | Whip antenna and method of producing same |
AU46514/99A AU4651499A (en) | 1999-07-13 | 1999-07-13 | Whip antenna and method of producing the same |
PCT/JP1999/003767 WO2001004989A1 (en) | 1998-01-19 | 1999-07-13 | Whip antenna and method of producing the same |
EP99929805A EP1114489A1 (en) | 1999-07-13 | 1999-07-13 | Whip antenna and method of producing the same |
KR1020017003234A KR20010106475A (en) | 1999-07-13 | 1999-07-13 | Whip antenna and method of producing the same |
CA002343791A CA2343791A1 (en) | 1999-07-13 | 1999-07-13 | Whip antenna and method of producing the same |
NO20011277A NO20011277L (en) | 1998-01-19 | 2001-03-13 | Whip antenna and method for making such an antenna |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP00783198A JP3163480B2 (en) | 1998-01-19 | 1998-01-19 | Whip antenna and manufacturing method thereof |
PCT/JP1999/003767 WO2001004989A1 (en) | 1998-01-19 | 1999-07-13 | Whip antenna and method of producing the same |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001004989A1 true WO2001004989A1 (en) | 2001-01-18 |
Family
ID=26342207
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1999/003767 WO2001004989A1 (en) | 1998-01-19 | 1999-07-13 | Whip antenna and method of producing the same |
Country Status (4)
Country | Link |
---|---|
JP (1) | JP3163480B2 (en) |
CN (1) | CN1318214A (en) |
NO (1) | NO20011277L (en) |
WO (1) | WO2001004989A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003032507A1 (en) * | 2001-10-05 | 2003-04-17 | Eung-Soon Chang | Urethane antenna of communication equipment and method for coating outer surface of urethane antenna of the same |
WO2003032506A1 (en) * | 2001-10-08 | 2003-04-17 | Eung-Soon Chang | Antenna knob of communication equipment and method for coating the same |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3163480B2 (en) * | 1998-01-19 | 2001-05-08 | 株式会社トーキン | Whip antenna and manufacturing method thereof |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4435713A (en) * | 1981-11-20 | 1984-03-06 | Motorola, Inc. | Whip antenna construction |
US5546094A (en) * | 1993-07-26 | 1996-08-13 | Harada Kogyo Kabushiki Kaisha | Telescopic antenna for portable telephones |
EP0755091A1 (en) * | 1995-02-07 | 1997-01-22 | Sony Corporation | Antenna for two frequency bands |
WO1998031069A1 (en) * | 1997-01-07 | 1998-07-16 | Galtronics Ltd. | Helical antenna element |
EP0892457A1 (en) * | 1997-07-16 | 1999-01-20 | Tokin Corporation | Antenna assembly comprising whip antenna and helical antenna contained in antenna top rotatably mounted on top end of the whip antenna |
EP0903804A1 (en) * | 1997-07-29 | 1999-03-24 | Tokin Corporation | Lightweight antenna assembly comprising a whip antenna and a helical antenna mounted on a top end of the whip antenna |
JPH11186833A (en) * | 1997-12-17 | 1999-07-09 | Tokin Corp | Helical antenna |
JPH11205019A (en) * | 1998-01-19 | 1999-07-30 | Tokin Corp | Whip antenna and its manufacture |
-
1998
- 1998-01-19 JP JP00783198A patent/JP3163480B2/en not_active Expired - Fee Related
-
1999
- 1999-07-13 WO PCT/JP1999/003767 patent/WO2001004989A1/en not_active Application Discontinuation
- 1999-07-13 CN CN99810849A patent/CN1318214A/en active Pending
-
2001
- 2001-03-13 NO NO20011277A patent/NO20011277L/en unknown
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4435713A (en) * | 1981-11-20 | 1984-03-06 | Motorola, Inc. | Whip antenna construction |
US5546094A (en) * | 1993-07-26 | 1996-08-13 | Harada Kogyo Kabushiki Kaisha | Telescopic antenna for portable telephones |
EP0755091A1 (en) * | 1995-02-07 | 1997-01-22 | Sony Corporation | Antenna for two frequency bands |
WO1998031069A1 (en) * | 1997-01-07 | 1998-07-16 | Galtronics Ltd. | Helical antenna element |
EP0892457A1 (en) * | 1997-07-16 | 1999-01-20 | Tokin Corporation | Antenna assembly comprising whip antenna and helical antenna contained in antenna top rotatably mounted on top end of the whip antenna |
EP0903804A1 (en) * | 1997-07-29 | 1999-03-24 | Tokin Corporation | Lightweight antenna assembly comprising a whip antenna and a helical antenna mounted on a top end of the whip antenna |
JPH11186833A (en) * | 1997-12-17 | 1999-07-09 | Tokin Corp | Helical antenna |
JPH11205019A (en) * | 1998-01-19 | 1999-07-30 | Tokin Corp | Whip antenna and its manufacture |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 12 29 October 1999 (1999-10-29) * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003032507A1 (en) * | 2001-10-05 | 2003-04-17 | Eung-Soon Chang | Urethane antenna of communication equipment and method for coating outer surface of urethane antenna of the same |
WO2003032506A1 (en) * | 2001-10-08 | 2003-04-17 | Eung-Soon Chang | Antenna knob of communication equipment and method for coating the same |
Also Published As
Publication number | Publication date |
---|---|
NO20011277L (en) | 2001-05-14 |
JPH11205019A (en) | 1999-07-30 |
JP3163480B2 (en) | 2001-05-08 |
NO20011277D0 (en) | 2001-03-13 |
CN1318214A (en) | 2001-10-17 |
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