EP1753083A1 - Monopolantennen - Google Patents

Monopolantennen Download PDF

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Publication number
EP1753083A1
EP1753083A1 EP06007138A EP06007138A EP1753083A1 EP 1753083 A1 EP1753083 A1 EP 1753083A1 EP 06007138 A EP06007138 A EP 06007138A EP 06007138 A EP06007138 A EP 06007138A EP 1753083 A1 EP1753083 A1 EP 1753083A1
Authority
EP
European Patent Office
Prior art keywords
monopole antenna
conductive element
substrate
ground
radio signal
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Withdrawn
Application number
EP06007138A
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English (en)
French (fr)
Inventor
Chih-Lung Chen
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.)
Wistron Neweb Corp
Original Assignee
Wistron Neweb Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Wistron Neweb Corp filed Critical Wistron Neweb Corp
Publication of EP1753083A1 publication Critical patent/EP1753083A1/de
Withdrawn legal-status Critical Current

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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
    • H01Q9/32—Vertical arrangement of element
    • H01Q9/36—Vertical arrangement of element with top loading
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/08—Means for collapsing antennas or parts thereof
    • H01Q1/10—Telescopic elements
    • 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
    • H01Q1/48—Earthing means; Earth screens; Counterpoises

Definitions

  • the invention relates in general to monopole antennas and in particular to monopole antennas for UHF/VHF radio signals.
  • Embedded antennas such as chip antennas and planar antennas, are widely applied in wireless communication devices.
  • a conventional type is a ceramic chip antenna produced by LTCC (Low Temperature Co-fired Ceramic) technology.
  • Conventional planar antennas such as microstrip antennas, printed antennas and planar Inverted F Antennas (PIFAs), are generally applied in GSM, DCS, UMTS, WLAN, and Bluetooth wireless equipment such as mobile phones and wireless LAN adapters.
  • a conventional planar monopole antenna primarily comprises a substrate S, a ground G, a conductive element R and a cable W.
  • the ground G and the conductive element R are formed on a surface S1 of the substrate S with the conductive element R longitudinal in direction Y.
  • the cable W such as a coaxial cable, comprises a signal wire W1 enclosed by a ground wire W2.
  • the conductive element R comprises a feed end RF adjacent to the ground G.
  • the feed end RF is connected to the signal wire W1
  • the ground G is connected to the ground wire W2, respectively.
  • the frequency coverage ratio of a conventional planar monopole antenna is usually less than 30%, adversely affecting communication efficiency. Moreover, it is not convenient to switch between VHF and UHF during usage due to bandwidth limitations of conventional planar monopole antennas.
  • An embodiment of a monopole antenna transmitting radio signals within a specific frequency range includes a substrate, a ground, a first sleeve portion, a second sleeve portion, a first conductive element, a second conductive element and a cable.
  • the first conductive element and the ground are formed on the substrate.
  • the first and second sleeves electrically connect the ground and project from a side of the ground in a first direction.
  • the first conductive element comprises a feed end and a connection portion adjacent to an edge of the substrate.
  • the second conductive element connects the connection portion and projects from the edge of the substrate substantially in the first direction.
  • the cable connects the ground and the feed end to transmit the radio signal.
  • FIG. 1 is a perspective diagram of a conventional monopole antenna
  • FIGS. 2A and 2B are perspective diagrams of an embodiment of a monopole antenna
  • FIG. 3A is a perspective diagram illustrating VSWR between 100-900MHz of the monopole antenna in FIG. 2A;
  • FIG. 3B is a perspective diagram illustrating VSWR between 100-900MHz of the monopole antenna in FIG. 2B;
  • FIG. 4 is a perspective diagram of another embodiment of a monopole antenna
  • FIG. 5 is a perspective diagram of another embodiment of a monopole antenna
  • FIG. 6 is a perspective diagram of another embodiment of a monopole antenna
  • FIG. 7 is a perspective diagram of another embodiment of a monopole antenna
  • FIG. 8 is a perspective diagram of another embodiment of a monopole antenna
  • FIG. 9 is a perspective diagram of another embodiment of a monopole antenna.
  • FIG. 10 is a perspective diagram of another embodiment of a monopole antenna.
  • an exemplary embodiment of a monopole antenna transmitting radio signals within a specific frequency range includes a substrate S, a ground G, a first sleeve G1, a second sleeve G2, a first conductive element R1, a second conductive element R2 and a cable W.
  • the ground G and the conductive element R1 are formed on a surface S1 of the substrate S.
  • the second conductive element R2 is retractable along Y axis and connected to a connection portion RC of the first conductive element R1, wherein the connection portion RC is adjacent to an edge of the substrate S.
  • the second conductive element R2 projects from the edge of the substrate S.
  • the first conductive element R1 is longitudinal in direction Y and comprises a feed end RF at an end thereof.
  • the feed end RF is adjacent to a side G' of the ground G, substantially parallel to the X axis.
  • the cable W such as a coaxial cable, comprises a signal wire W1 and enclosed by a ground wire W2.
  • the signal wire W1 is connected to the feed end RF, and the ground wire W2 is connected to the ground G, respectively.
  • the first and second sleeves G1 and G2 are parallel and formed on the surface S1 with the first conductive element R disposed therebetween. As shown in FIG. 2A, the first sleeve G1 has a first length L1, and the second sleeve G2 has a second length L2, both projecting from the side G' of the ground G in direction Y, wherein the first length L1 is substantially equal to the second length L2.
  • the substrate S is FR4 (Flame Retardant Type 4)
  • the ground G, the first and second sleeves G1 and G2 are metal, integrally formed on the surface S 1 by PCB fabrication.
  • the first conductive element R1, the first and second sleeves G1 and G2 can exhibit capacitive effect and facilitate broader bandwidth for wireless communication.
  • the second conductive element R2 when the monopole antenna is applied for VHF radio signal communications, the second conductive element R2 is extended from length L4 to L4' (L4'>L4) in a first direction (direction Y), wherein length L4' is substantially equal to 1/4 of a specific. VHF radio signal wavelength.
  • total length of the first and second conductive elements R1 and R2 can also be adjusted substantially to 1/4 of a GSM radio signal wavelength for wireless communication.
  • the second conductive element R2 is retractable and comprises a first section R21, a second section R22 and a third section R23 telescopically connected along Y axis.
  • the second conductive element R2 When the second conductive element R2 is extended, total length of the first and second conductive elements R1 and R2 is increased along Y axis, facilitating wireless communication efficiency of VHP radio signals.
  • the second conductive element R2 comprises two or more sections telescopically connected along Y axis, such that the length of the second conductive element R2 is adjustable.
  • FIGS. 3A and 3B illustrate Voltage Standing Wave Ratio (VSWR) between 100-900MHz of the monopole antenna in FIGS. 2A and 2B, respectively.
  • a standard antenna requires an available VSWR less than 3.
  • available frequency range under VSWR ⁇ 3 is between 400-860MHZ, substantially covering the bandwidth of UHF (460-860MHZ).
  • available frequency range under VSWR ⁇ 3 substantially covers two bandwidths of UHF (460-860MHZ) and VHF (170-2300MHZ).
  • FIG. 4 shows another embodiment of a monopole antenna.
  • the second conductive element R2' is a spiral conductor, substituted for the telescopic conductive element R2 in FIGS. 2A and 2B.
  • the second conductive element R2' connects a connection portion RC at an end of the first conductive element R1 and projects from an edge of the substrate S in the first direction (direction Y).
  • the length L5 of the first conductive element R1 is substantially equal to 1/4 of a specific UHF radio signal wavelength. Further, the length L5 is also substantially equal to the sum of the lengths of the first sleeve G1, the second sleeve G2 and the side G' (the distance between the sleeves G1 and G2).
  • total length L5' of the first and second conductive elements R1 and R2' in direction Y exceeds the length L5 of the first conductive element R1, providing analogous functions such as the extendable conductive element R2 in FIG. 2B, capable of wireless communications for UHF (460-860MHZ) and VHF (170-2300MHZ).
  • the length L5' of the first and second conductive elements R1 and R2' is configured corresponding to 1/4 of a specific VHF radio signal wavelength
  • the length of the second conductive element R2' in direction Y is configured according to its spiral radius and actual extended length. As the length of the spiral-shaped conductive element R2' along Y axis is less than its actual extended length, the extent of the antenna is reduced.
  • FIG. 5 shows another embodiment of a monopole antenna.
  • the first conductive element R1 comprises a main body R1 and a pair of L-shaped angle portions R12 and R13 symmetrically disposed with respect to the main body R1.
  • the angle portions R12 and R13 connect an end of the main body R11 and extend opposite to direction Y.
  • total length L6 of the main body R11 and each of the angle portions R12 and R13 is substantially equal to 1/4 of a specific UHF radio signal wavelength.
  • total length L6' of the first and second conductive elements R1 and R2' in direction Y is configured corresponding to a specific VHF radio signal wavelength, and the length of the second conductive element R2' in direction Y is configured according to its spiral radius and actual extended length. Owing to the configuration of the first conductive elements R1 with the angle portions R2 and R3 extended opposite to direction Y, the extent of substrate S and the first conductive element R1 of the antenna is reduced in direction Y.
  • FIG. 6 shows another embodiment of a monopole antenna.
  • a substrate S comprises a slot H
  • the main body R11 of the first conductive element R1 comprises a depression h corresponding to the slot H.
  • total length L7 of the main body R11 and each of the angle portions R2 and R3 is substantially equal to 1/4 of a specific UHF radio signal wavelength.
  • total length L7' of the first and second conductive elements R1 and R2' along Y axis is configured corresponding to a specific VHF radio signal wavelength
  • the length of the second conductive element R2' in direction Y is configured according to its spiral radius and actual extended length. Since the second conductive element R2' is received in the slot H and connected to the connection portion RC, the extent of the antenna in direction Y is reduced.
  • FIG. 7 shows another embodiment of a monopole antenna.
  • the L-shaped angle portions R12 and R13 are symmetrically disposed on opposite sides of the main body R11 of the first conductive element R1.
  • the two angle portions R12 and R13 connect to the middle of the main body R11 and extend in the first direction (direction Y), however, the angle portions R12 and R13 can also connect to other portions of the main body R11.
  • total length L8 of the main body R11 and each of the angle portions R12 and R13 is substantially equal to 1/4 of a specific UHF radio signal wavelength.
  • total length L8' of the first and second conductive elements R1 and R2' in direction Y is configured corresponding to a specific VHF radio signal wavelength, and the length of the second conductive element R2' in direction Y is configured according to its spiral radius and actual extended length.
  • FIG. 8 shows another embodiment of a monopole antenna combined with FIGS. 6 and 7.
  • the substrate S comprises a slot H
  • the main body R11 of the first conductive element R1 comprises a depression h corresponding to the slot H.
  • the second conductive element R2' is received in the slot H and connected to a connection portion RC of the first conductive element R1, wherein the connection portion RC is located at the bottom of the depression h.
  • the two angle portions R12 and R13 symmetrically connect the main body R11 and extend in the first direction (direction Y).
  • total length L9 of the main body R11 and each of the angle portions R12 and R13 is substantially equal to 1/4 of a specific UHF radio signal wavelength.
  • total length L9' of the first and second conductive elements R1 and R2' in direction Y is configured corresponding to a specific VHF radio signal wavelength, and the length of the second conductive element R2' in direction Y is configured according to its spiral radius and actual extended length. Since the second conductive element R2' is received in the slot H, the extent of substrate S and the first conductive element R1 of the antenna is reduced in direction Y.
  • FIG. 9 shows another embodiment of a monopole antenna.
  • the monopole antenna such as a microstrip antenna, comprises two angle portions R12 and R13 with zigzag structures symmetrically disposed on both sides of the main body R11.
  • the first sleeve G1, the second sleeve G2 and the ground G are formed on a different surface from the first conductive element R1.
  • the first sleeve G1, the second sleeve G2 and the ground G are formed on a surface of the substrate S different opposite to the first conductive element R1.
  • a signal wire of a cable (not shown) is connected to the feed end RF at the bottom of the first conductive element R1 , and a ground wire of the cable (not shown) is connected to the ground G on the opposite surface different from the feed end RF.
  • FIG. 10 shows another embodiment of a monopole antenna.
  • the monopole antenna has a Coplanar Waveguide (CPW) feed configuration with the first conductive element R1 and parts of the ground G disposed on the same surface S1 of the substrate S.
  • the first and second sleeves G1, G2 and parts of the ground G are disposed on a surface of the substrate S opposite to the first conductive element R1, wherein the ground G, and the first and second sleeves G1 and G2 are electrically connected.
  • a signal wire of a cable (not shown) is connected to the feed end RF at the bottom of the first conductive element R1, and a ground wire of the cable (not shown) is connected to the ground G on the same surface as the feed end RF.
  • total length of the main body R11 and each actual extended length of the angle portions R12 and R13 is substantially equal to 1/4 of a specific UHF radio signal wavelength. Further, total length of the first and second conductive elements R1 and R2' in direction Y is configured corresponding to a specific VHF radio signal wavelength, and the length of the second conductive element R2' in direction Y is configured according to its spiral radius and actual extended length.
  • Monopole antennas with symmetrical sleeve structures are provided according to the embodiments.
  • the sleeve structures, ground and a first conductive element can be formed on a substrate by PCB fabrication, exhibiting capacitive effect and facilitating broader bandwidth for wireless communication.
  • the first conductive element is configured in different formations to facilitate miniaturization of the antenna.
  • the second conductive element such as the retractable conductor R2' in FIG. 2B or the spiral-shaped conductor R2' in FIGS. 4-10, connects the first conductive element and projects from an edge of the substrate, to facilitate wireless communication efficiency for VHF radio signals and provide a multifunctional monopole antenna for UHF/VFEF radio signals.
  • the monopole antenna can also be used for GSM signal communications. As the monopole antenna provides better communication efficiency for UBF/VBF radio signals, it can be widely applied for UHF/VHF and DVB broadcast devices, such as digital TVs.

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  • Variable-Direction Aerials And Aerial Arrays (AREA)
EP06007138A 2005-08-10 2006-04-04 Monopolantennen Withdrawn EP1753083A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 200510089485 CN1913227B (zh) 2005-08-10 2005-08-10 单极天线

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EP1753083A1 true EP1753083A1 (de) 2007-02-14

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EP06007138A Withdrawn EP1753083A1 (de) 2005-08-10 2006-04-04 Monopolantennen

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CN (1) CN1913227B (de)

Families Citing this family (5)

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Publication number Priority date Publication date Assignee Title
CN102055055A (zh) * 2009-11-04 2011-05-11 纬创资通股份有限公司 制作天线的方法
CN108352614B (zh) * 2015-11-11 2020-10-23 沃克斯国际有限公司 具有wifi接收能力的全向电视天线
CN105932395A (zh) * 2016-05-31 2016-09-07 芜湖辉灿电子科技有限公司 多功能两用式手机天线
CN106887667B (zh) * 2017-04-26 2020-06-16 青岛海信移动通信技术股份有限公司 一种天线及移动终端
CN110416685B (zh) * 2018-04-28 2021-05-04 Oppo广东移动通信有限公司 电子装置

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2505751A (en) * 1946-09-27 1950-05-02 John T Bolljahn Broad band antenna
JPH04120902A (ja) * 1990-09-12 1992-04-21 Mitsubishi Electric Corp アンテナ装置
US5367311A (en) * 1991-11-08 1994-11-22 Harada Kogyo Kabushiki Kaisha Antenna for broad-band ultrahigh frequency
EP0716469A1 (de) * 1994-06-28 1996-06-12 Sony Corporation Antenne und tragbares funkgerät
US5949383A (en) * 1997-10-20 1999-09-07 Ericsson Inc. Compact antenna structures including baluns
US6081242A (en) * 1998-06-16 2000-06-27 Galtronics U.S.A., Inc. Antenna matching circuit
US6097341A (en) * 1997-05-07 2000-08-01 Nec Corporation Structure of an antenna for a portable radio communication apparatus
EP1193797A2 (de) * 2000-09-20 2002-04-03 Samsung Electronics Co., Ltd. Eingebaute Zweibandantenne und Verfahren zum Betrieb dieser Antenne in einem mobilen Terminal
US6392599B1 (en) * 1997-03-20 2002-05-21 David Ganeshmoorthy Communication antenna and equipment
EP1289051A1 (de) * 2000-06-01 2003-03-05 Mitsubishi Denki Kabushiki Kaisha Antennenelement und tragbares informationsendgerät

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2505751A (en) * 1946-09-27 1950-05-02 John T Bolljahn Broad band antenna
JPH04120902A (ja) * 1990-09-12 1992-04-21 Mitsubishi Electric Corp アンテナ装置
US5367311A (en) * 1991-11-08 1994-11-22 Harada Kogyo Kabushiki Kaisha Antenna for broad-band ultrahigh frequency
EP0716469A1 (de) * 1994-06-28 1996-06-12 Sony Corporation Antenne und tragbares funkgerät
US6392599B1 (en) * 1997-03-20 2002-05-21 David Ganeshmoorthy Communication antenna and equipment
US6097341A (en) * 1997-05-07 2000-08-01 Nec Corporation Structure of an antenna for a portable radio communication apparatus
US5949383A (en) * 1997-10-20 1999-09-07 Ericsson Inc. Compact antenna structures including baluns
US6081242A (en) * 1998-06-16 2000-06-27 Galtronics U.S.A., Inc. Antenna matching circuit
EP1289051A1 (de) * 2000-06-01 2003-03-05 Mitsubishi Denki Kabushiki Kaisha Antennenelement und tragbares informationsendgerät
EP1193797A2 (de) * 2000-09-20 2002-04-03 Samsung Electronics Co., Ltd. Eingebaute Zweibandantenne und Verfahren zum Betrieb dieser Antenne in einem mobilen Terminal

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 016, no. 379 (E - 1247) 13 August 1992 (1992-08-13) *
STUCHLY M A ET AL: "Modeling antenna close to the human body", 2000 IEEE AEROSPACE CONFERENCE PROCEEDINGS 18-25 MARCH 2000 BIG SKY, MT, USA, vol. 5, 2000, 2000 IEEE Aerospace Conference. Proceedings (Cat. No.00TH8484) IEEE Piscataway, NJ, USA, pages 83 - 89, XP002392287 *

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Publication number Publication date
CN1913227A (zh) 2007-02-14
CN1913227B (zh) 2013-07-03

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