WO2002033788A1 - Helical antenna structure in a mobile terminal - Google Patents
Helical antenna structure in a mobile terminal Download PDFInfo
- Publication number
- WO2002033788A1 WO2002033788A1 PCT/KR2001/001711 KR0101711W WO0233788A1 WO 2002033788 A1 WO2002033788 A1 WO 2002033788A1 KR 0101711 W KR0101711 W KR 0101711W WO 0233788 A1 WO0233788 A1 WO 0233788A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cap
- helical antenna
- mobile terminal
- winding coil
- antenna structure
- Prior art date
Links
- 238000004804 winding Methods 0.000 claims abstract description 27
- 230000003247 decreasing effect Effects 0.000 claims description 4
- 230000005855 radiation Effects 0.000 description 5
- 230000006866 deterioration Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- VJYFKVYYMZPMAB-UHFFFAOYSA-N ethoprophos Chemical compound CCCSP(=O)(OCC)SCCC VJYFKVYYMZPMAB-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- H01Q1/362—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith for broadside radiating 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
- 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
Definitions
- the present invention relates generally to a mobile terminal, and in particular, to an antenna structure in a mobile terminal.
- a mobile terminal has a helical antenna formed in an outward protrusion and a whip antenna.
- the helical antenna When the whip antenna is contained in the mobile terminal, the helical antenna is operational, and when the whip antenna is extended, the whip antenna is operational.
- FIGs. 1A and IB illustrate the operations of antennas in a conventional mobile terminal.
- a whip antenna 100 is contained in the terminal as shown in FIG. lA.
- an RF signal is transmitted/received through a helical antenna 102 formed within a cap
- the helical antenna is comprised of a winding coil and a cap covering the winding coil.
- the diameter of a top part TP equals that of a bottom part BP in the winding coil. Since the cylindrical winding coil is near to the outer surface of the cap, the helical antenna is significantly affected when it makes contact with a human body.
- an object of the present invention to provide a helical antenna structure, where the influence of a human body on the antenna's characteristics is prevented in a mobile terminal.
- a helical antenna structure of a mobile terminal which is minimally influenced by a human body.
- a cap protrudes from the upper end of the mobile terminal, and a winding coil is formed within the cap, which is spaced from an outer surface of the cap substantially the same distance from a bottom part of the cap to a top part of the cap.
- FIGs. lA and IB illustrate the operating state of a conventional antenna in a mobile terminal
- FIG. 2 illustrates a helical antenna structure in a mobile terminal according to an embodiment of the present invention
- FIG. 3 is a graph showing the impedance matching state of the conventional helical antenna formed into a cylindrical winding coil
- FIG. 4 is a graph showing the impedance matching state of the helical antenna formed into a conical winding coil, according to the embodiment of the present invention.
- FIG. 5 is a graph showing the omni-directional radiation characteristic of the conventional helical antenna formed into a cylindrical winding coil
- FIG. 6 is a graph showing the omni-directional radiation characteristic of the helical antenna formed into a conical winding coil according to the embodiment of the present invention.
- FIG. 7 is a graph showing the impedance matching state of the conventional helical antenna formed into a cylindrical winding coil when it contacts a human body.
- FIG. 8 is a graph showing the impedance matching state of the helical antenna formed into a conical winding coil, according to the embodiment of the present invention when it contacts a human body.
- FIG. 2 illustrates a cone-shaped helical antenna for a mobile terminal, according to an embodiment of the present invention.
- a helical antenna 200 is comprised of the cap 106 protruding outward from an upper end of the terminal 104 and a winding coil with a diameter decreasing from a bottom part BP to a top part TP to increase the distance between the winding coil and the outer surface of the cap 106, so that the distance or space between the outer surface of the cap 106a and the coil 200 remains substantially the same along the length of coil 200.
- the winding coil is formed into a cone shape so that the diameter of the coil is decreased at every turn from the bottom part BP to the top part TP, thereby maximizing the distance between the top part TP where a high voltage is induced and the outer surface of the cap 106. Therefore, the antenna's characteristics caused by contact between a human body and the outer surface of the cap 106, especially near the top part of the cap 106, is minimized.
- FIGs, 3 and 4 are graphs respectively showing the impedance matching states in free space of the conventional helical antenna formed into a cylindrical winding coil (FIG. 3) and the helical antenna formed into a conical winding coil according to the embodiment of the present invention (FIG. 4). As noted from FIGs. 3 and 4, both the antennas have VSWRs of 2 or below, which are indicative of excellent antenna characteristics.
- FIGs. 5 and 6 are graphs respectively showing the omni-directional radiation characteristics of the conventional helical antenna formed into a cylindrical winding coil (FIG. 5) and the helical antenna formed into a conical winding coil, according to the embodiment of the present invention (FIG. 6). As noted from FIGs. 5 and 6, both the antennas are almost the same in terms of antenna radiation characteristics in free space. That is, there is little difference between the antenna gains of the two antennas.
- FIGs, 7 and 8 are graphs respectively showing the impedance matching states of the conventional helical antenna formed into a cylindrical winding coil (FIG. 7) and the helical antenna formed into a conical winding coil, according to the embodiment of the present invention (FIG. 8) when a user touches the caps of the helical antennas with his finger during a call.
- the VSWR of the conventional helical antenna is about 6. This implies that little impedance is matched and thus the conventional antenna's characteristics to operate reliably have deteriorated significantly. On the contrary, the VSWR of the helical antenna, according to the embodiment of the present invention, is
- the helical antenna formed into a conical winding coil according to the embodiment of the present invention is similar to the conventional helical antenna formed into a cylindrical winding coil in terms of impedance matching states and antenna radiation characteristics in free space. Even when a human body contacts the cap of the helical antenna during a call, the helical antenna of the present invention maintains the antenna characteristics as in free space, as compared to the conventional helical antenna, which exhibits significant deterioration of its operational characteristics.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Support Of Aerials (AREA)
- Details Of Aerials (AREA)
Abstract
Description
Claims
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IL15542701A IL155427A0 (en) | 2000-10-18 | 2001-10-11 | Helical antenna structure in a mobile terminal |
AU9605601A AU9605601A (en) | 2000-10-18 | 2001-10-11 | Helical antenna structure in a mobile terminal |
AU2001296056A AU2001296056B2 (en) | 2000-10-18 | 2001-10-11 | Helical antenna structure in a mobile terminal |
JP2002536678A JP2004512721A (en) | 2000-10-18 | 2001-10-11 | Helical antenna structure for mobile communication terminals |
EP01976902A EP1327286A4 (en) | 2000-10-18 | 2001-10-11 | Helical antenna structure in a mobile terminal |
CA002426132A CA2426132C (en) | 2000-10-18 | 2001-10-11 | Helical antenna structure in a mobile terminal |
BR0114711-0A BR0114711A (en) | 2000-10-18 | 2001-10-11 | Helical antenna structure in a mobile terminal |
IL155427A IL155427A (en) | 2000-10-18 | 2003-04-14 | Helical antenna structure in a mobile terminal |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR2000/61250 | 2000-10-18 | ||
KR1020000061250A KR100350866B1 (en) | 2000-10-18 | 2000-10-18 | Helical antenna structure of portable communication terminal |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002033788A1 true WO2002033788A1 (en) | 2002-04-25 |
Family
ID=19694078
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/KR2001/001711 WO2002033788A1 (en) | 2000-10-18 | 2001-10-11 | Helical antenna structure in a mobile terminal |
Country Status (10)
Country | Link |
---|---|
US (1) | US6593899B2 (en) |
EP (1) | EP1327286A4 (en) |
JP (1) | JP2004512721A (en) |
KR (1) | KR100350866B1 (en) |
CN (1) | CN1260855C (en) |
AU (2) | AU9605601A (en) |
BR (1) | BR0114711A (en) |
CA (1) | CA2426132C (en) |
IL (2) | IL155427A0 (en) |
WO (1) | WO2002033788A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6927744B2 (en) | 2001-08-28 | 2005-08-09 | Nec Corporation | Antenna structure of mobile communication device and mobile communication device having the same antenna structure |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7525505B2 (en) * | 2006-09-13 | 2009-04-28 | Antenex, Inc. | Antenna cover |
CN201138685Y (en) * | 2007-12-28 | 2008-10-22 | 深圳华为通信技术有限公司 | Wireless terminal antenna |
US20100053456A1 (en) * | 2008-08-28 | 2010-03-04 | Hong Kong Applied Science And Technology Research Institute Co., Ltd. | Mobile Multimedia Terminal Antenna Systems and Methods for Use Thereof |
JP5293645B2 (en) * | 2010-03-03 | 2013-09-18 | 株式会社日本自動車部品総合研究所 | Antenna device |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5479178A (en) * | 1993-05-21 | 1995-12-26 | Samsung Electronics Co., Ltd. | Portable radio antenna |
KR19980035440U (en) * | 1996-12-12 | 1998-09-15 | 박병재 | Air brake emergency release device |
US5963871A (en) * | 1996-10-04 | 1999-10-05 | Telefonaktiebolaget Lm Ericsson | Retractable multi-band antennas |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4163981A (en) * | 1978-03-27 | 1979-08-07 | Wilson Thomas J | Spring tunable helical whip antenna |
DE3036084A1 (en) * | 1980-09-25 | 1982-04-29 | Robert Bosch Gmbh, 7000 Stuttgart | ROD AERIAL, IN PARTICULAR FOR VHF BROADCAST RECEPTION |
US4435716A (en) * | 1981-09-14 | 1984-03-06 | Adrian Zandbergen | Method of making a conical spiral antenna |
GB2305298B (en) * | 1995-09-14 | 1999-05-19 | Andrew Jesman | Process for the production of helically wound antenna with a moulded sheath |
US6166707A (en) * | 1996-04-01 | 2000-12-26 | Motorola, Inc. | Antenna shroud for a portable communications device |
KR100233080B1 (en) * | 1996-11-13 | 1999-12-01 | 윤종용 | Antenna for portable radiotelephone |
US5977931A (en) * | 1997-07-15 | 1999-11-02 | Antenex, Inc. | Low visibility radio antenna with dual polarization |
GB2344938A (en) * | 1998-12-18 | 2000-06-21 | Nokia Mobile Phones Ltd | A multiple band, multiple co-axial element antenna |
-
2000
- 2000-10-18 KR KR1020000061250A patent/KR100350866B1/en not_active IP Right Cessation
-
2001
- 2001-09-06 US US09/947,687 patent/US6593899B2/en not_active Expired - Lifetime
- 2001-10-11 CN CNB018176089A patent/CN1260855C/en not_active Expired - Fee Related
- 2001-10-11 JP JP2002536678A patent/JP2004512721A/en active Pending
- 2001-10-11 AU AU9605601A patent/AU9605601A/en active Pending
- 2001-10-11 WO PCT/KR2001/001711 patent/WO2002033788A1/en active IP Right Grant
- 2001-10-11 CA CA002426132A patent/CA2426132C/en not_active Expired - Fee Related
- 2001-10-11 EP EP01976902A patent/EP1327286A4/en not_active Withdrawn
- 2001-10-11 IL IL15542701A patent/IL155427A0/en active IP Right Grant
- 2001-10-11 BR BR0114711-0A patent/BR0114711A/en not_active IP Right Cessation
- 2001-10-11 AU AU2001296056A patent/AU2001296056B2/en not_active Ceased
-
2003
- 2003-04-14 IL IL155427A patent/IL155427A/en not_active IP Right Cessation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5479178A (en) * | 1993-05-21 | 1995-12-26 | Samsung Electronics Co., Ltd. | Portable radio antenna |
US5963871A (en) * | 1996-10-04 | 1999-10-05 | Telefonaktiebolaget Lm Ericsson | Retractable multi-band antennas |
KR19980035440U (en) * | 1996-12-12 | 1998-09-15 | 박병재 | Air brake emergency release device |
Non-Patent Citations (1)
Title |
---|
See also references of EP1327286A4 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6927744B2 (en) | 2001-08-28 | 2005-08-09 | Nec Corporation | Antenna structure of mobile communication device and mobile communication device having the same antenna structure |
Also Published As
Publication number | Publication date |
---|---|
EP1327286A4 (en) | 2005-10-19 |
US20020047813A1 (en) | 2002-04-25 |
KR100350866B1 (en) | 2002-09-05 |
EP1327286A1 (en) | 2003-07-16 |
CN1260855C (en) | 2006-06-21 |
AU2001296056B2 (en) | 2004-11-04 |
CA2426132C (en) | 2005-11-29 |
JP2004512721A (en) | 2004-04-22 |
BR0114711A (en) | 2003-11-18 |
IL155427A0 (en) | 2003-11-23 |
CN1470088A (en) | 2004-01-21 |
KR20020030896A (en) | 2002-04-26 |
US6593899B2 (en) | 2003-07-15 |
CA2426132A1 (en) | 2002-04-25 |
IL155427A (en) | 2007-10-31 |
AU9605601A (en) | 2002-04-29 |
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