US3902177A - Antenna for direction finders - Google Patents

Antenna for direction finders Download PDF

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Publication number
US3902177A
US3902177A US338419A US33841973A US3902177A US 3902177 A US3902177 A US 3902177A US 338419 A US338419 A US 338419A US 33841973 A US33841973 A US 33841973A US 3902177 A US3902177 A US 3902177A
Authority
US
United States
Prior art keywords
antenna
frequency
loop antenna
conductor
auxiliary conductor
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.)
Expired - Lifetime
Application number
US338419A
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English (en)
Inventor
Kenzo Mori
Hyo Yasuda
Yujiro Katsube
Norio Ikeda
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.)
Taiyo Musen Co Ltd
Original Assignee
Taiyo Musen Co Ltd
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 Taiyo Musen Co Ltd filed Critical Taiyo Musen Co Ltd
Application granted granted Critical
Publication of US3902177A publication Critical patent/US3902177A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01Q7/04—Screened antennas
    • 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
    • H01Q5/378—Combination of fed elements with parasitic elements

Definitions

  • ABSTRACT This invention relates to an antenna for direction finders presenting a high sensitivity in a narrow band by making a loop antenna and a shielding tube resonate at any two desired frequencies.
  • Loop antennas are generally used as directional an tennas for direction finders. It is the general practice to fit such loop antenna with a shielding tube. However, conventional antennas of this kind have a high sensitivity only at a comparatively low frequency. Further, by inserting a condenser between both ends of a loop antenna and making its electrostatic capacitance and the inductance of the antenna resonate with each other, the sensitivity can be increased near the resonating fre quency.
  • An object of the present invention is to provide an antenna for direction finders wherein a suitable electrostatic capacitance is formed also between both ends of another auxiliary conductor arranged near and in parallel with a conductor forming a loop antenna as in the above mentioned shielding tube and said electrostatic capacitance and the inductance of the auxiliary conductor are made to resonate with each other so that a high sensitivity may be again presented at any desired frequency higher than the above mentioned resonating frequency.
  • the drawing is a view showing a wiring of an embodiment of the present invention.
  • a conductor forming a loop antenna 1 is fitted with a shielding tube 2 provided with a cut 3 in the top part.
  • a proper insulator 4 is inserted between the inside surface of the shielding tube 2 and the antenna l.
  • a condenser 5 is inserted between both ends of such loop antenna 1 and a condenser 6 is connected also between both ends of the cut 3 of the shielding tube 2 so as to respectively form proper electrostatic capacitances.
  • Both terminals 7 and 8 of the loop antenna I can be connected with a cable 10 through a transformer. Further, a resistance 11 connects to the secondary side or primary side of the transformer 9.
  • such two loop antennas as are de scribed above are so arranged as to intersect at right angles with each other and are led to a goniometer or the like through respective cables.
  • the shielding tube 2 can be used not only as directly grounded but also without being grounded.
  • suitable electrostatic capacitances 6 and 5 are connected respectively in a cut in the top part. for example, of a shielding tube arranged near and in parallel with a conductor forming a loop antenna and between both ends of the loop antenna.
  • the inductance of the loop antenna l and the electrostatic capacitance 5 between both ends of the loop antenna are resonated with each other at any desired first frequency and the inductance of the shielding tube 2 and the electrostatic capacitance 6 between both ends of the shielding tube are resonated with each other at any higher suitable second frequency so that all members 1 through 9 may resonate at a still higher third frequency.
  • the antenna will have the same sensitivity as of a conventional loop antenna of this kind and the impedance as seen from the terminals 7 and 8 will show an inductivity.
  • the impedance as seen toward the antenna side from the terminals 7 and 8 will become so high that the sensitivity will quickly rise.
  • the impedance will vary to be capacitive from being inductive.
  • the frequency of the arriving waves further increases to a third frequency which is higher than said second frequency at which the electrostatic capacitance by the condenser 6 or the like and the inductance of the shielding tube 2 resonate with each other, the impedance as seen from the terminals 7 and 8 will vary again to be inductive and will resonate with the condenser 5, therefore a large electric current will be induced in said antenna 1 and the receiving sensitivity will increase again.
  • the shielding tube is utilized as an auxiliary Conductor.
  • the loop antenna may be formed of a tubular conductor and an auxiliary conductor may be coaxially arranged within said tubular conductor.
  • An antenna for direction finders comprising a first conductor forming a loop antenna having opposite ends, an auxiliary conductor having a cut at the top thereof arranged near and in parallel with said first conductor, first capacitor means connected between both ends of said loop antenna for providing a resonant circuit with said loop antenna which is resonant at a first frequency and second capacitor means connected between both ends of said out of said auxiliary conductor at the top part of said antenna for providing a resonant circuit with said auxiliary conductor which is resonant at a second frequency higher than said first frequency, the values of inductance of said auxiliary conductor and of capacitance of said second capacitor means being selected with respect to the values of inductance of said loop antenna and of capacitance of said first capacitor means so that at a third frequency higher than said second frequency the combination of said auxiliary conductor and second capacitor means provides inductive impedance of such value as to cooperate with said first capacitor means and cause said loop antenna to be resonant at said third frequency permitting a high sensitivity in each narrow band of said

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  • Details Of Aerials (AREA)
US338419A 1972-09-19 1973-03-06 Antenna for direction finders Expired - Lifetime US3902177A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP47093217A JPS5226879B2 (OSRAM) 1972-09-19 1972-09-19

Publications (1)

Publication Number Publication Date
US3902177A true US3902177A (en) 1975-08-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
US338419A Expired - Lifetime US3902177A (en) 1972-09-19 1973-03-06 Antenna for direction finders

Country Status (2)

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US (1) US3902177A (OSRAM)
JP (1) JPS5226879B2 (OSRAM)

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4083006A (en) * 1973-07-10 1978-04-04 Agency Of Industrial Science & Technology Loop type standard magnetic field generator
US4288794A (en) * 1979-12-26 1981-09-08 Textron Inc. Shielded loop VOR/ILS antenna system
DE3140319A1 (de) * 1981-10-10 1983-04-21 Klaus 3300 Braunschweig Münter Elektrisch abgeschirmte breitbandantenne zur phasenrichtigen erfassung der magnetischen komponente eines elektromagnetischen wechselfeldes
US4605899A (en) * 1982-10-15 1986-08-12 Thomson Csf Magnetic field sensor using a coaxial line wound into a coil
US4792760A (en) * 1986-02-07 1988-12-20 Thomson-Cgr Reception antenna for optical image formation device using nuclear magnetic resonance
US4816766A (en) * 1985-11-18 1989-03-28 Siemens Aktiengesellschaft Surface coil for examination using a nuclear magnetic resonance apparatus
US4847491A (en) * 1986-06-10 1989-07-11 Etablissement Public De Diffusion Dit: Telediffusion De France Resonant loop current disturbing probe
WO1989007347A1 (en) * 1988-02-04 1989-08-10 Uniscan Ltd. Magnetic field concentrator
FR2636781A1 (fr) * 1988-09-16 1990-03-23 Matra Systemes Securite Cadre antenne pour poste de controle de presence, emettant un signal primaire pour recevoir en echo de repondeurs des signaux individualises
EP0371562A1 (en) * 1988-11-28 1990-06-06 N.V. Nederlandsche Apparatenfabriek NEDAP Coil antenna device
US5248989A (en) * 1988-02-04 1993-09-28 Unisan Ltd. Magnetic field concentrator
EP0584882A1 (en) * 1992-08-28 1994-03-02 Philips Electronics Uk Limited Loop antenna
US5363113A (en) * 1987-05-07 1994-11-08 General Electric Cgr S.A. Electromagnetic antenna and excitation antenna provided with such electromagnetic antenna for a nuclear magnetic resonance apparatus
US5485165A (en) * 1994-08-15 1996-01-16 The United States Of America As Represented By The Secretary Of The Army Broadband high efficiency full wave open coaxial stub loop antenna
USH1571H (en) * 1994-06-29 1996-08-06 Hansen; Peder M. Dual-feed, dual-mode antenna for mono-directional pattern
US5751255A (en) * 1996-06-07 1998-05-12 Carter, Jr.; Philip S. Electrically small receiving antennas
WO2001089034A1 (de) * 2000-05-15 2001-11-22 Siemens Transit Telematic Systems Ag Trägerelement für eine antenne mit geringer handempfindlichkeit
US6636040B1 (en) 1999-12-17 2003-10-21 Fonar Corporation MRI antenna
US6847210B1 (en) 1999-12-17 2005-01-25 Fonar Corporation MRI antenna
US20060038730A1 (en) * 2004-08-19 2006-02-23 Harris Corporation Litzendraht loop antenna and associated methods
US7091843B1 (en) 2002-11-05 2006-08-15 Rajiv Singh Lal Functional and ornamental vehicle accessories
EP1665459A4 (en) * 2003-05-01 2006-11-22 Meadwestvaco Corp APPARATUS AND METHOD FOR PRODUCING AN INTEGRATED SYMETRISOR ANTENNA
USD535984S1 (en) * 2003-01-06 2007-01-30 Rajiv S. Lal Ring-shaped vehicle accessory
US20070257857A1 (en) * 2003-07-25 2007-11-08 Marino Ronald A Apparatus for and Method of Using a Diversity Antenna
US20100182149A1 (en) * 2004-05-18 2010-07-22 Marino Ronald A Apparatus for and method of using rfid antenna configurations
FR3016246A1 (fr) * 2014-01-06 2015-07-10 Commissariat Energie Atomique Antenne haute frequence
US10402600B1 (en) * 2017-10-30 2019-09-03 Amazon Technologies, Inc. Mobile tray for performing RFID reads
WO2020131966A1 (en) * 2018-12-17 2020-06-25 Raytheon Company Shielded-loop-resonator based gradiometer probe

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58173912U (ja) * 1982-05-18 1983-11-21 八木アンテナ株式会社 微小アンテナ
JPS59107144U (ja) * 1983-01-07 1984-07-19 沖電気工業株式会社 半導体チツプ容器
JPH03265305A (ja) * 1990-03-15 1991-11-26 Fuji Electric Co Ltd 複同調アンテナとそのアンテナを有する信号発生器

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2419577A (en) * 1945-03-12 1947-04-29 Standard Telephones Cables Ltd Antenna system
US2423083A (en) * 1943-03-05 1947-07-01 Standard Telephones Cables Ltd Loop antenna system
US2535053A (en) * 1945-06-05 1950-12-26 Michael D Ercolino Portable radio compass

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2423083A (en) * 1943-03-05 1947-07-01 Standard Telephones Cables Ltd Loop antenna system
US2419577A (en) * 1945-03-12 1947-04-29 Standard Telephones Cables Ltd Antenna system
US2535053A (en) * 1945-06-05 1950-12-26 Michael D Ercolino Portable radio compass

Cited By (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4083006A (en) * 1973-07-10 1978-04-04 Agency Of Industrial Science & Technology Loop type standard magnetic field generator
US4288794A (en) * 1979-12-26 1981-09-08 Textron Inc. Shielded loop VOR/ILS antenna system
DE3140319A1 (de) * 1981-10-10 1983-04-21 Klaus 3300 Braunschweig Münter Elektrisch abgeschirmte breitbandantenne zur phasenrichtigen erfassung der magnetischen komponente eines elektromagnetischen wechselfeldes
US4605899A (en) * 1982-10-15 1986-08-12 Thomson Csf Magnetic field sensor using a coaxial line wound into a coil
US4816766A (en) * 1985-11-18 1989-03-28 Siemens Aktiengesellschaft Surface coil for examination using a nuclear magnetic resonance apparatus
US4792760A (en) * 1986-02-07 1988-12-20 Thomson-Cgr Reception antenna for optical image formation device using nuclear magnetic resonance
US4847491A (en) * 1986-06-10 1989-07-11 Etablissement Public De Diffusion Dit: Telediffusion De France Resonant loop current disturbing probe
US5363113A (en) * 1987-05-07 1994-11-08 General Electric Cgr S.A. Electromagnetic antenna and excitation antenna provided with such electromagnetic antenna for a nuclear magnetic resonance apparatus
US5248989A (en) * 1988-02-04 1993-09-28 Unisan Ltd. Magnetic field concentrator
WO1989007347A1 (en) * 1988-02-04 1989-08-10 Uniscan Ltd. Magnetic field concentrator
FR2636781A1 (fr) * 1988-09-16 1990-03-23 Matra Systemes Securite Cadre antenne pour poste de controle de presence, emettant un signal primaire pour recevoir en echo de repondeurs des signaux individualises
EP0371562A1 (en) * 1988-11-28 1990-06-06 N.V. Nederlandsche Apparatenfabriek NEDAP Coil antenna device
EP0584882A1 (en) * 1992-08-28 1994-03-02 Philips Electronics Uk Limited Loop antenna
US5422650A (en) * 1992-08-28 1995-06-06 U.S. Philips Corporation Loop antenna with series resonant circuit and parallel reactance providing dual resonant frequencies
USH1571H (en) * 1994-06-29 1996-08-06 Hansen; Peder M. Dual-feed, dual-mode antenna for mono-directional pattern
US5485165A (en) * 1994-08-15 1996-01-16 The United States Of America As Represented By The Secretary Of The Army Broadband high efficiency full wave open coaxial stub loop antenna
US5751255A (en) * 1996-06-07 1998-05-12 Carter, Jr.; Philip S. Electrically small receiving antennas
US6847210B1 (en) 1999-12-17 2005-01-25 Fonar Corporation MRI antenna
US7573432B1 (en) 1999-12-17 2009-08-11 Fonar Corporation MRI antenna
US6636040B1 (en) 1999-12-17 2003-10-21 Fonar Corporation MRI antenna
EP1158601A1 (de) * 2000-05-15 2001-11-28 Häni Prolectron Ag Trägerelement für eine Antenne mit geringer Handempfindlichkeit
US6637665B2 (en) 2000-05-15 2003-10-28 Siemens Schweiz Ag Carrier element for an antenna
WO2001089034A1 (de) * 2000-05-15 2001-11-22 Siemens Transit Telematic Systems Ag Trägerelement für eine antenne mit geringer handempfindlichkeit
US20070013505A1 (en) * 2002-11-05 2007-01-18 Mr. Rajiv Lai Functional and ornamental vehicle accessories
US7091843B1 (en) 2002-11-05 2006-08-15 Rajiv Singh Lal Functional and ornamental vehicle accessories
US8330595B2 (en) 2002-11-05 2012-12-11 Rajiv Lal Functional and ornamental vehicle accessories
USD535984S1 (en) * 2003-01-06 2007-01-30 Rajiv S. Lal Ring-shaped vehicle accessory
EP1665459A4 (en) * 2003-05-01 2006-11-22 Meadwestvaco Corp APPARATUS AND METHOD FOR PRODUCING AN INTEGRATED SYMETRISOR ANTENNA
US7834816B2 (en) 2003-07-25 2010-11-16 Sensormatic Electronics Llc Apparatus for and method of using a diversity antenna
US20070257857A1 (en) * 2003-07-25 2007-11-08 Marino Ronald A Apparatus for and Method of Using a Diversity Antenna
US20100182149A1 (en) * 2004-05-18 2010-07-22 Marino Ronald A Apparatus for and method of using rfid antenna configurations
US7205947B2 (en) * 2004-08-19 2007-04-17 Harris Corporation Litzendraht loop antenna and associated methods
US20060038730A1 (en) * 2004-08-19 2006-02-23 Harris Corporation Litzendraht loop antenna and associated methods
FR3016246A1 (fr) * 2014-01-06 2015-07-10 Commissariat Energie Atomique Antenne haute frequence
US10402600B1 (en) * 2017-10-30 2019-09-03 Amazon Technologies, Inc. Mobile tray for performing RFID reads
WO2020131966A1 (en) * 2018-12-17 2020-06-25 Raytheon Company Shielded-loop-resonator based gradiometer probe
US11460599B2 (en) 2018-12-17 2022-10-04 Raytheon Company Shielded-loop-resonator based gradiometer probe

Also Published As

Publication number Publication date
JPS5226879B2 (OSRAM) 1977-07-16
JPS4951892A (OSRAM) 1974-05-20

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