EP1280231A1 - Antenne boucle en forme de diamant pour dispositif d'entrée/sortie sans fil - Google Patents

Antenne boucle en forme de diamant pour dispositif d'entrée/sortie sans fil Download PDF

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Publication number
EP1280231A1
EP1280231A1 EP01118163A EP01118163A EP1280231A1 EP 1280231 A1 EP1280231 A1 EP 1280231A1 EP 01118163 A EP01118163 A EP 01118163A EP 01118163 A EP01118163 A EP 01118163A EP 1280231 A1 EP1280231 A1 EP 1280231A1
Authority
EP
European Patent Office
Prior art keywords
wing
loop antenna
diamond
antenna
wireless
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Withdrawn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
EP01118163A
Other languages
German (de)
English (en)
Inventor
Ku Tainan Scienc-Based Industr. Park Yao-Yang
Su Tainan Scienc-Based Industr. Park Hsien-Cheng
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.)
RF-Link Systems Inc
RF Link Systems Inc
Original Assignee
RF-Link Systems Inc
RF Link Systems Inc
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 RF-Link Systems Inc, RF Link Systems Inc filed Critical RF-Link Systems Inc
Priority to EP01118163A priority Critical patent/EP1280231A1/fr
Publication of EP1280231A1 publication Critical patent/EP1280231A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • 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
    • 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
    • H01Q11/06—Rhombic antennas; V-antennas
    • 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
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/26—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength
    • 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
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/26—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength
    • H01Q9/265—Open ring dipoles; Circular dipoles
    • 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
    • H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Definitions

  • the present invention generally relates to a loop antenna for a wireless I/O device, and more specifically to a diamond-shaped loop antenna with a side wing on two opposite sides respectively.
  • FIG. 1 shows such a typical rectangular-shaped loop antenna 100.
  • ISM Industrial, Scientific and Medical
  • the primary object of this invention is to provide a loop antenna with a diamond-shaped structure, which under the condition of matching the circuit impedances, the antenna has a high efficiency of radiation, and is less affected by hand.
  • this invention proposes a diamond-shaped loop antenna for wireless I/O device, its feature is as follows: on two opposite sides of the loop antenna each has a side wing, which forms an upper-edge-angle with the upper side of the antenna.
  • the side wing itself also has a wing-angle, and both the upper-edge-angle and the wing-angle are located on the same plane.
  • FIG. 1 shows the block diagram of a typical rectangular-shaped loop antenna.
  • FIG. 2 shows the block diagram of an embodiment of the diamond-shaped loop antenna according to this invention.
  • FIG. 3 shows the experimental result of return loss measured for the embodiment according to this invention.
  • FIG. 4 shows the measurement result on the Smith Chart for the embodiment according to this invention.
  • FIG. 5 shows the result of radiation field type measured for the embodiment according to this invention.
  • FIG. 6 shows the result of radiation field type measured for the embodiment according to this invention.
  • FIG. 2 shows the block diagram of an embodiment of the diamond-shaped loop antenna according to this invention.
  • the diamond-shaped antenna 200 comprising: a microwave element 210 having first side 211, second side 212 and third side 213 formed by a metal wire, said sides being formed in a loop shape, said first side 211 and second side 212 having a side wing 214, 215 respectively; a feedline 220 being located at one end of said first side 211; and an output end 230 being located at one end of said second side 212; wherein said side wing 214 and said third side 213 of the microwave element 210 form an upper-edge-angle ⁇ , and said side wing 214 itself also has a wing-angle ⁇ .
  • the upper-edge-angle ⁇ and the wing-angle ⁇ are located on the same plane, wherein the two upper-edge-angles ⁇ both have a degree of 45°, and the two wing-angles ⁇ both have a degree of 90°.
  • the antenna is made of copper with diameter of 0.8mm.
  • the diamond-shaped antenna 200 has two side wings 214, 215, which result in the upper-edge-angle ⁇ and the wing-angle ⁇ , it reduces the hand effect from antenna radiation characteristics.
  • the antenna radiation field type is measured by using the near-field measurement system developed by the Near-field System Inc. (NSI).
  • NSSI Near-field System Inc.
  • the maximum far-field value obtained for the antenna transmitted power is -53.54dB, but to measure the effect when a hand is located 2cm above the antenna, the maximum far-field value obtained is -57.53dB, thus the hand has an effect of about 4dB for the antenna.
  • the diamond-shaped loop antenna 200 is measured as shown in FIG.
  • the maximum far-field value obtained is -52.21dB, and when a hand is located 2cm above the antenna, the maximum far-field value obtained is - 55.95dB.
  • the hand has an effect of about 3.7dB on the antenna.
  • FIG. 4 shows the measurement result on the Smith Chart for the embodiment according to this invention. The chart shows that the same conclusion is obtained in this figure as in FIG. 3.
  • FIG. 5 shows the result of radiation field type measured for the embodiment according to this invention.
  • the measured E plane (x-z plane) field type is obtained by operating the antenna at 2.45GHz, wherein the thick line represents the experimental result without palm effect and the thin line represents the experimental result with palm effect respectively.
  • FIG. 6 shows the result of radiation field type measured for the embodiment according to this invention.
  • the measured H plane (y-z plane) field type is obtained by operating the antenna at 2.45GHz, wherein the thick line represents the experimental result without palm effect and the thin line represents the experimental result with palm effect respectively.
  • the radiation field type (E-plane: x-z) which is perpendicular to the hand direction (y direction)
  • the radiation field type (H-plane: y-z) which is parallel to the hand direction (y direction), is more affected by hand.
  • this invention proposes a diamond-shaped loop antenna having a simple design, only needing to change the two opposite sides of the general rectangular-shaped loop antenna into two side wings with diamond-shaped structure. Then the radiation efficiency can be improved, and the hand effect on the antenna characteristics is reduced. Moreover, a typical copper may fabricate the material of the antenna. This achieves an antenna with low cost, high application value, and good efficiency. It has not only accomplished an expecting practical use but also a new design.
EP01118163A 2001-07-26 2001-07-26 Antenne boucle en forme de diamant pour dispositif d'entrée/sortie sans fil Withdrawn EP1280231A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP01118163A EP1280231A1 (fr) 2001-07-26 2001-07-26 Antenne boucle en forme de diamant pour dispositif d'entrée/sortie sans fil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP01118163A EP1280231A1 (fr) 2001-07-26 2001-07-26 Antenne boucle en forme de diamant pour dispositif d'entrée/sortie sans fil

Publications (1)

Publication Number Publication Date
EP1280231A1 true EP1280231A1 (fr) 2003-01-29

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP01118163A Withdrawn EP1280231A1 (fr) 2001-07-26 2001-07-26 Antenne boucle en forme de diamant pour dispositif d'entrée/sortie sans fil

Country Status (1)

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EP (1) EP1280231A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1601049A1 (fr) * 2004-05-19 2005-11-30 Delphi Technologies, Inc. Antenne en boucle à deux bandes
US7768400B2 (en) 2005-06-25 2010-08-03 Omni-Id Limited Electromagnetic radiation decoupler
US7880619B2 (en) 2006-06-16 2011-02-01 Omni-Id Limited Electromagnetic enhancement and decoupling
US8453936B2 (en) 2006-12-14 2013-06-04 Omni-Id Cayman Limited Switchable radiation enhancement and decoupling
US8636223B2 (en) 2008-08-20 2014-01-28 Omni-Id Cayman Limited One and two-part printable EM tags
US8684270B2 (en) 2006-12-20 2014-04-01 Omni-Id Cayman Limited Radiation enhancement and decoupling

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB692692A (en) * 1947-12-24 1953-06-10 Charles Alexander Vivian Heath Improvements in and relating to radio aerials
US5767813A (en) * 1993-05-27 1998-06-16 Raytheon Ti Systems, Inc. Efficient electrically small loop antenna with a planar base element
WO2001063697A1 (fr) * 2000-02-26 2001-08-30 Anthony Rabie Antenne

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB692692A (en) * 1947-12-24 1953-06-10 Charles Alexander Vivian Heath Improvements in and relating to radio aerials
US5767813A (en) * 1993-05-27 1998-06-16 Raytheon Ti Systems, Inc. Efficient electrically small loop antenna with a planar base element
WO2001063697A1 (fr) * 2000-02-26 2001-08-30 Anthony Rabie Antenne

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
WONHA CHOE ET AL: "ANALYSIS OF HIGHER ORDER REGULAR POLYGONAL LOOP ANTENNAS", IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, IEEE INC. NEW YORK, US, vol. 38, no. 7, 1 July 1990 (1990-07-01), pages 1114 - 1117, XP000137535, ISSN: 0018-926X *

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7710335B2 (en) 2004-05-19 2010-05-04 Delphi Technologies, Inc. Dual band loop antenna
EP1601049A1 (fr) * 2004-05-19 2005-11-30 Delphi Technologies, Inc. Antenne en boucle à deux bandes
US9104952B2 (en) 2005-06-25 2015-08-11 Omni-Id Cayman Limited Electromagnetic radiation decoupler
US7768400B2 (en) 2005-06-25 2010-08-03 Omni-Id Limited Electromagnetic radiation decoupler
US8299927B2 (en) 2005-06-25 2012-10-30 Omni-Id Cayman Limited Electromagnetic radiation decoupler
US9646241B2 (en) 2005-06-25 2017-05-09 Omni-Id Cayman Limited Electromagnetic radiation decoupler
US7880619B2 (en) 2006-06-16 2011-02-01 Omni-Id Limited Electromagnetic enhancement and decoupling
US8264358B2 (en) 2006-06-16 2012-09-11 Omni-Id Cayman Limited Electromagnetic enhancement and decoupling
US8502678B2 (en) 2006-06-16 2013-08-06 Omni-Id Cayman Limited Electromagnetic enhancement and decoupling
US8453936B2 (en) 2006-12-14 2013-06-04 Omni-Id Cayman Limited Switchable radiation enhancement and decoupling
US8684270B2 (en) 2006-12-20 2014-04-01 Omni-Id Cayman Limited Radiation enhancement and decoupling
US8794533B2 (en) 2008-08-20 2014-08-05 Omni-Id Cayman Limited One and two-part printable EM tags
US8636223B2 (en) 2008-08-20 2014-01-28 Omni-Id Cayman Limited One and two-part printable EM tags

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