ATE118291T1 - COIL ANTENNA DEVICE. - Google Patents

COIL ANTENNA DEVICE.

Info

Publication number
ATE118291T1
ATE118291T1 AT89203011T AT89203011T ATE118291T1 AT E118291 T1 ATE118291 T1 AT E118291T1 AT 89203011 T AT89203011 T AT 89203011T AT 89203011 T AT89203011 T AT 89203011T AT E118291 T1 ATE118291 T1 AT E118291T1
Authority
AT
Austria
Prior art keywords
adjoining sections
antenna device
junction
coil antenna
pair
Prior art date
Application number
AT89203011T
Other languages
German (de)
Inventor
Tallienco Wieand Harm Fockens
Original Assignee
Nedap Nv
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 Nedap Nv filed Critical Nedap Nv
Application granted granted Critical
Publication of ATE118291T1 publication Critical patent/ATE118291T1/en

Links

Classifications

    • 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
    • H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
    • H01Q1/2216—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in interrogator/reader equipment
    • 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
    • H01Q5/35—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using two or more simultaneously fed points
    • 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
    • H01Q5/50—Feeding or matching arrangements for broad-band or multi-band operation
    • 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

Landscapes

  • Near-Field Transmission Systems (AREA)
  • Details Of Aerials (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
  • Aerials With Secondary Devices (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

A loop antenna device (10) for a two-frequency electromagnetic detection system is disclosed. The device serves to generate an electromagnetic interrogation field for detecting responders comprised by the system. The device comprises a closed loop built up of four adjoining sections having substantially equal impedances, the junction between each pair of adjoining sections together (11, 12, 13, 14) with the junction between the complementary pair of adjoining sections forming a connection port so that two connection ports (31, 33, 32, 34) are provided which in operation are available for two independent signals having different frequencies.
AT89203011T 1988-11-28 1989-11-27 COIL ANTENNA DEVICE. ATE118291T1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL8802914A NL8802914A (en) 1988-11-28 1988-11-28 ANTENNA CONFIGURATION FOR TWO FREQUENCIES.

Publications (1)

Publication Number Publication Date
ATE118291T1 true ATE118291T1 (en) 1995-02-15

Family

ID=19853291

Family Applications (1)

Application Number Title Priority Date Filing Date
AT89203011T ATE118291T1 (en) 1988-11-28 1989-11-27 COIL ANTENNA DEVICE.

Country Status (4)

Country Link
EP (1) EP0371562B1 (en)
AT (1) ATE118291T1 (en)
DE (1) DE68921048T2 (en)
NL (1) NL8802914A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL9002120A (en) * 1990-09-28 1992-04-16 Nedap Nv PULSE DEACTIVATOR.

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5226879B2 (en) * 1972-09-19 1977-07-16
US4012742A (en) * 1975-12-29 1977-03-15 International Telephone And Telegraph Corporation Multimode loop antenna
DE2921225A1 (en) * 1979-05-25 1980-12-04 Helge Bothfeld Directional aerial for over 100 MHZ range - has radiator consisting of two four-pole elements, using part of electric conductor length, according to preferred polarisation plane
US4260990A (en) * 1979-11-08 1981-04-07 Lichtblau G J Asymmetrical antennas for use in electronic security systems
JPS6347058Y2 (en) * 1980-03-03 1988-12-06
GB2180123B (en) * 1984-12-21 1989-01-18 Senezco Limited Transponder systems

Also Published As

Publication number Publication date
DE68921048D1 (en) 1995-03-23
EP0371562B1 (en) 1995-02-08
EP0371562A1 (en) 1990-06-06
NL8802914A (en) 1990-06-18
DE68921048T2 (en) 1995-06-01

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