US20080150807A1 - Multi-band antenna - Google Patents

Multi-band antenna Download PDF

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Publication number
US20080150807A1
US20080150807A1 US11/613,260 US61326006A US2008150807A1 US 20080150807 A1 US20080150807 A1 US 20080150807A1 US 61326006 A US61326006 A US 61326006A US 2008150807 A1 US2008150807 A1 US 2008150807A1
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US
United States
Prior art keywords
radiating branch
band antenna
radiating
feeding conductor
branch
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Granted
Application number
US11/613,260
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US7382326B1 (en
Inventor
Ching-Chi Lin
Kai Shih
Yu-Yuan Wu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cheng Uei Precision Industry Co Ltd
Original Assignee
Cheng Uei Precision Industry Co Ltd
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Filing date
Publication date
Application filed by Cheng Uei Precision Industry Co Ltd filed Critical Cheng Uei Precision Industry Co Ltd
Priority to US11/613,260 priority Critical patent/US7382326B1/en
Assigned to CHENG UEI PRECISION INDUSTRY CO., LTD. reassignment CHENG UEI PRECISION INDUSTRY CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LIN, CHING-CHI, SHIH, KAI, WU, YU-YUAN
Application granted granted Critical
Publication of US7382326B1 publication Critical patent/US7382326B1/en
Publication of US20080150807A1 publication Critical patent/US20080150807A1/en
Expired - Fee Related legal-status Critical Current
Adjusted expiration legal-status Critical

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1615—Constructional details or arrangements for portable computers with several enclosures having relative motions, each enclosure supporting at least one I/O or computing function
    • G06F1/1616—Constructional details or arrangements for portable computers with several enclosures having relative motions, each enclosure supporting at least one I/O or computing function with folding flat displays, e.g. laptop computers or notebooks having a clamshell configuration, with body parts pivoting to an open position around an axis parallel to the plane they define in closed position
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
    • G06F1/1684—Constructional details or arrangements related to integrated I/O peripherals not covered by groups G06F1/1635 - G06F1/1675
    • G06F1/1698—Constructional details or arrangements related to integrated I/O peripherals not covered by groups G06F1/1635 - G06F1/1675 the I/O peripheral being a sending/receiving arrangement to establish a cordless communication link, e.g. radio or infrared link, integrated cellular phone
    • 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
    • H01Q1/2258—Supports; Mounting means by structural association with other equipment or articles used with computer equipment
    • H01Q1/2266—Supports; Mounting means by structural association with other equipment or articles used with computer equipment disposed inside the computer
    • 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
    • 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
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • 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
    • H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
    • H01Q5/335—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors at the feed, e.g. for impedance matching
    • 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

Abstract

A multi-band antenna configured in a portable electrical device capable of operating in a low frequency bandwidth and a high frequency bandwidth has an elongated radiating body and a feeding conductor connecting the elongated radiating body. The feeding conductor has opposite side arms respectively connecting the elongated radiating body and a connecting portion connecting the side arms. A feeding point is arranged at a corner where one of the side arms connects to the connecting portion. The elongated radiating body and the feeding conductor are located on different planes of the portable electronic device. According to the position where the feeding conductor connects to the elongated radiating body and the position where the feeding point is arranged at, the multi-band antenna has a preferred low frequency bandwidth and a preferred high frequency bandwidth. Therefore, the portable electrical device can operate at different wireless bandwidths.

Description

    BACKGROUND OF THE INVENTION
  • 1. Field of the Invention
  • The invention relates to a multi-band antenna, and particularly to a multi-band antenna which is adapted for configuring in portable electrical devices.
  • 2. The Related Art
  • There is a growing requirement for multi-band antennas used in wireless communication devices to adapt multi-band operation of wireless communication devices. It is necessary that an antenna adapting to being configured in wireless communication devices is capable of operating in various wireless communication bands such as GSM850 (Global System for Mobile communications), EGSM (Extended Global System for Mobile communications), DCS1800 (Digital Cellular System), PCS1900 (Personal Conferencing Specification), W-CDMA2100 (Wideband Code Division Multiple Access), Wi-Fi (Wireless Fidelity), etc.
    • SUMMARY OF THE INVENTION
  • An object of the present invention is to provide a multi-band antenna operating in various wireless communication bands.
  • According to the invention, the multi-band antenna includes an antenna body defining opposite ends and a feeding conductor connecting to the antenna body. The antenna body has a first radiating branch defining opposite elongated edges, a second radiating branch extending from one end of the first radiating branch and a third radiating branch extending from the other end of the first radiating branch. Wherein the length of the first radiating branch is larger than the length of the second radiating branch and the length of the first radiating branch is also larger than the length of the third radiating branch.
  • The feeding conductor is curved to U-shape having a feeding point. The feeding conductor has opposite side arms and a connecting portion. One end of each side arm respectively connects to the second radiating branch and the other end of each side arm respectively connects both ends of the connecting portion. An outer edge of one of the side arms is at the same level with an area where the first radiating branch connects to the second radiating branch. The feeding point is arranged at a corner of the feeding conductor near the outer edge connecting the first radiating branch.
  • While the multi-band antenna operates at wireless communication, the multi-band antenna has a low frequency bandwidth and a high frequency harmonic bandwidth. According to the position where the feeding conductor connects to the antenna body, and the position where the feeding point is arranged at the corner of the feeding conductor, the multi-band antenna has a preferred range of the low frequency bandwidth and the high frequency harmonic bandwidth. Therefore, the low frequency bandwidth of the multi-band antenna includes GSM850 and EGSM bands and the high frequency harmonic bandwidth of the multi-band antenna includes DCP1800, PCS1900, W-CDMA2100 and Wi-Fi bands.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • The present invention will be apparent to those skilled in the art by reading the following description of a preferred embodiment thereof, with reference to the attached drawings, in which:
  • FIG. 1 shows the structure of a preferred embodiment of a multi-band antenna according to the present invention; and
  • FIG. 2 illustrates the multi-band antenna configured in a notebook.
    •  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
  • Please refer to FIG. 1, which shows the structure of a preferred embodiment of a multi-band antenna 100 according to the present invention. The multi-band antenna 100 is made of metallic substances for example, making from a metal foil, printing on a printed circuit board and etc, having an antenna body 1 and a feeding conductor 2.
  • The antenna body 1 defining a first end 13 and a second end 14 includes a first radiating branch 10 defining opposite elongated edges. A second radiating branch 11 having the first end 13 extends from one end of the first radiating branch 10. In this case, the width of the first radiating branch 10 is narrower than the width of the second radiating branch 11 and the length of the first radiating branch 10 is longer than the length of the second radiating branch 11. A third radiating branch 12 having the second end 14 extends from the other end of the first radiating branch 10. The third radiating branch 12 is perpendicular to the first radiating branch 10. In this case, the length of the third radiating branch 12 is shorter than the length of the first radiating branch 10 and the width of the third radiating branch 12 is wider than the width of the first radiating branch 10. In this case, both the second radiating branch 11 and the third radiating branch 12 project toward the same direction.
  • The feeding conductor 2 connects to the antenna body 1. In this case, the feeding conductor 2 extends from an edge of the second radiating branch 11. In this case, the feeding conductor 2 and the second radiating branch 11 project to opposite directions. The feeding conductor 2 is curved to form U-shape having a first side arm 20, a second side arm 21 opposite to the first side arm 20 and a connecting portion 22. The first and second side arms 20, 21 respectively have an inner edge facing each other and an outer edge opposite to the inner edge. One end of the first and second side arms 20, 21 respectively connects to the second radiating branch 11. The other end of the first and second side arms 20, 21 respectively connects to both ends of the connecting portion 22.
  • In this case, the outer edge of the first side arm 20 is at the same level with an area where the first radiating branch 10 connects to the second radiating branch 11. A feeding point 3 is arranged at a corner where the first side arm 20 connects to the connecting portion 22. A grounding portion 4 is arranged around the feeding conductor 2. In this case, the grounding portion 4 is arranged to close a corner where the first branch 10 connects to the first side arm 20 of the feeding conductor 2.
  • Referring to FIG. 2, the multi-band antenna 100 is folded for fitting in portable electrical devices. In this case, the multi-band antenna 100 is configured in a laptop 200. The first radiating branch 10, the second radiating branch 11 and the third radiating branch 12 are located on a top 201 of a display of the laptop 200. An end portion of the third radiating branch 12 is located on a front surface 202 of the display of the laptop 200. The feeding conductor 2 and the grounding portion 4 are located on a back surface 203 of the display of the laptop 200. In this case, the grounding portion 1 electronically connects to a ground of the laptop 200. Otherwise, in a further embodiment, the grounding portion 4 could be the ground of the laptop 200. The laptop 200 can operate the multi-band antenna 100 through a cable 204 connecting to the feeding point 3 of the multi-band antenna 100 and the ground portion 4 for sending and receiving wireless signal.
  • While the multi-band antenna 100 operates at wireless communication, the multi-band antenna 100 resonates a low frequency bandwidth and a high frequency harmonic bandwidth. In this case, a length from the feeding conductor 2 connecting the antenna body 1 to the second end 14 of the antenna body 1 is a quarter of the wavelength of the low frequency bandwidth. A length from the feeding conductor 2 connecting the antenna body 1 to the first end 13 of the antenna body 1 is a quarter of the wavelength of the high frequency harmonic bandwidth.
  • Therefore, according to the position where the feeding conductor 2 connects to the antenna body 1 and the position where the feeding point 3 is arranged at the corner of the feeding conductor 2, the multi-band antenna 100 has a preferred low frequency bandwidth and a high frequency harmonic bandwidth. Because the outer edge of the feeding conductor 2 is at the same level with the area where the first radiating branch 10 connecting the second radiating branch 11 and the feeding point 3 is arranged at the corner where the first side arm 20 connecting to the connecting portion 22, the low frequency bandwidth of the multi-band antenna 100 includes GSM850 and EGSM bands and the high frequency harmonic bandwidth of the multi-band antenna 100 includes DCP1800, PCS1900, W-CDMA2100 and Wi-Fi bands.
  • Moreover, the U-shape feeding conductor 2 is designed for balancing horizontal polarization and vertical polarization of the multi-band antenna 100 and enhancing the low frequency bandwidth of the multi-band antenna 100.
  • Furthermore, the present invention is not limited to the embodiments described above; various additions, alterations and the like may be made within the scope of the present invention by a person skilled in the art. For example, respective embodiments may be appropriately combined.

Claims (12)

1. A multi-band antenna comprising:
an antenna body having a first radiating branch having opposite elongated edges, a second radiating branch extending from one end of said first radiating branch, a third radiating branch extending from the other end of said first radiating branch and perpendicular to said first radiating branch, said second and third radiating branches projecting to the same direction;
a feeding conductor substantially formed U-shape and connecting to said antenna body, said feeding conductor and said second radiating branch projecting to opposite directions, said feeding conductor extending from an area where said first radiating branch connecting said second radiating branch; and
a feeding point arranged at a corner of said feeding conductor.
2. The multi-band antenna as claimed in claim 1, wherein the length of said first radiating branch is longer than the length of said second radiating branch, the width of said first radiating branch is narrower than the width of said second radiating branch, the length of said third radiating branch is shorter than said length of said first radiating branch, the width of third radiating branch is wider than said width of said first radiating branch.
3. The multi-band antenna as claimed in claim 1, wherein said feeding conductor has a first side arm, a second side arm which is opposite to said first side arm, and a connecting portion, said first and second side arms respectively have an inner edge facing each other and an outer edge opposite to said inner edge, one end of said first and second side arms respectively connects to said second radiating branch and the other end of said first and said second side arms respectively connects to both ends of said connecting portion, said outer edge of said first side arm is at the same level with said area, said feeding point is arranged at said corner where said first side arm connects to said connecting portion.
4. The multi-band antenna as claimed in claim 1, further comprising a grounding portion arranged around said feeding conductor.
5. The multi-band antenna as claimed in claim 4, wherein said antenna body is located on a top of a display of a laptop, a free end portion of said third radiating branch is located on a front surface of said display of said laptop, said feeding conductor and said grounding portion are located on a back surface of said display of said laptop, said laptop operates said multi-band antenna through a cable connecting to said feeding point and said grounding portion.
6. The multi-band antenna as claimed in claim 5, wherein said grounding portion electronically connects to a ground of said laptop.
7. A multi-band antenna operating at a low frequency bandwidth and a high frequency bandwidth two to three frequency higher than said lower frequency bandwidth comprising:
an elongated antenna body having a first end and a second end, said antenna body having a first radiating branch, a second radiating branch having said first end and extending from one end of said first radiating branch and a third radiating branch having said second end and extending from the other end of said first radiating branch;
a feeding conductor connecting to said antenna body having a first side arm, a second side arm opposite to said first side arm and a connecting portion, one end of said first and second side arms respectively connecting both ends of said connecting portion, the other end of said first and second side arms respectively connecting said antenna body, a length from said feeding conductor connecting said antenna body to said first end substantially a quarter of the wavelength of said high frequency bandwidth, a length from said feeding conductor connecting said antenna body to said second end substantially a quarter of the wavelength of said low frequency bandwidth; and
a feeding point arranged at a corner where said first side arm connects to said connecting portion.
8. The multi-band antenna as claimed in claim 7, wherein the length of said first radiating branch is longer than the length of said second radiating branch, the width of said first radiating branch is narrower than the width of said second radiating branch, the length of said third radiating branch is shorter than said length of said first radiating branch, the width of said third radiating branch is wider than said width of said first radiating branch.
9. The multi-band antenna as claimed in claim 7, wherein said first and second side arms respectively have an outer edge opposite to each other, said outer edge of said first side arm is at same level with an area where said first radiating branch connects to said second radiating branch.
10. The multi-band antenna as claimed in claim 9, further comprising a grounding portion arranged around said feeding point.
11. The multi-band antenna as claimed in claim 10, wherein said multi-band antenna is folded to fit for being configured in a portable electronic device, said antenna body and said feeding conductor is substantially located on different planes of said portable electronic device.
12. The multi-band antenna as claimed in claim 11, wherein said grounding portion is a ground of said portable electronic device.
US11/613,260 2006-12-20 2006-12-20 Multi-band antenna Expired - Fee Related US7382326B1 (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110116424A1 (en) * 2009-11-19 2011-05-19 Hand Held Products, Inc. Network-agnostic encoded information reading terminal
US8141784B2 (en) 2009-09-25 2012-03-27 Hand Held Products, Inc. Encoded information reading terminal with user-configurable multi-protocol wireless communication interface
US8596533B2 (en) 2011-08-17 2013-12-03 Hand Held Products, Inc. RFID devices using metamaterial antennas
US8779898B2 (en) 2011-08-17 2014-07-15 Hand Held Products, Inc. Encoded information reading terminal with micro-electromechanical radio frequency front end
US10013588B2 (en) 2011-08-17 2018-07-03 Hand Held Products, Inc. Encoded information reading terminal with multi-directional antenna
US11024965B2 (en) * 2017-06-27 2021-06-01 Murata Manufacturing Co., Ltd. Dual band antenna device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080062045A1 (en) * 2006-09-08 2008-03-13 Motorola, Inc. Communication device with a low profile antenna

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060176233A1 (en) * 2005-02-04 2006-08-10 Chia-Lun Tang Planar monopole antenna
US20070109199A1 (en) * 2005-11-14 2007-05-17 Hon Hai Precision Ind. Co., Ltd. Multi-band antenna with low-profile
US20070120753A1 (en) * 2005-11-28 2007-05-31 Hon Hai Precision Ind. Co., Ltd. Multi-band antenna
US20070194993A1 (en) * 2005-12-14 2007-08-23 Deavours Daniel D Inductively coupled feed structure and matching circuit for rfid device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060176233A1 (en) * 2005-02-04 2006-08-10 Chia-Lun Tang Planar monopole antenna
US20070109199A1 (en) * 2005-11-14 2007-05-17 Hon Hai Precision Ind. Co., Ltd. Multi-band antenna with low-profile
US20070120753A1 (en) * 2005-11-28 2007-05-31 Hon Hai Precision Ind. Co., Ltd. Multi-band antenna
US20070194993A1 (en) * 2005-12-14 2007-08-23 Deavours Daniel D Inductively coupled feed structure and matching circuit for rfid device

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8141784B2 (en) 2009-09-25 2012-03-27 Hand Held Products, Inc. Encoded information reading terminal with user-configurable multi-protocol wireless communication interface
US8708236B2 (en) 2009-09-25 2014-04-29 Hand Held Products, Inc. Encoded information reading terminal with user-configurable multi-protocol wireless communication interface
US8919654B2 (en) 2009-09-25 2014-12-30 Hand Held Products, Inc. Encoded information reading terminal with user-configurable multi-protocol wireless communication interface
US9231644B2 (en) 2009-09-25 2016-01-05 Hand Held Products, Inc. Encoded information reading terminal with user-configurable multi-protocol wireless communication interface
US9485802B2 (en) 2009-09-25 2016-11-01 Hand Held Products, Inc. Encoded information reading terminal with user-configurable multi-protocol wireless communication interface
US9775190B2 (en) 2009-09-25 2017-09-26 Hand Held Products, Inc. Encoded information reading terminal with user-configurable multi-protocol wireless communication interface
US10075997B2 (en) 2009-09-25 2018-09-11 Hand Held Products, Inc. Encoded information reading terminal with user-configurable multi-protocol wireless communication interface
US20110116424A1 (en) * 2009-11-19 2011-05-19 Hand Held Products, Inc. Network-agnostic encoded information reading terminal
US8596533B2 (en) 2011-08-17 2013-12-03 Hand Held Products, Inc. RFID devices using metamaterial antennas
US8779898B2 (en) 2011-08-17 2014-07-15 Hand Held Products, Inc. Encoded information reading terminal with micro-electromechanical radio frequency front end
US10013588B2 (en) 2011-08-17 2018-07-03 Hand Held Products, Inc. Encoded information reading terminal with multi-directional antenna
US11024965B2 (en) * 2017-06-27 2021-06-01 Murata Manufacturing Co., Ltd. Dual band antenna device

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