GB419783A - Improvements in and relating to wireless receiving apparatus - Google Patents

Improvements in and relating to wireless receiving apparatus

Info

Publication number
GB419783A
GB419783A GB3548/34A GB354834A GB419783A GB 419783 A GB419783 A GB 419783A GB 3548/34 A GB3548/34 A GB 3548/34A GB 354834 A GB354834 A GB 354834A GB 419783 A GB419783 A GB 419783A
Authority
GB
United Kingdom
Prior art keywords
aerials
receiver
circuit
shield
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.)
Expired
Application number
GB3548/34A
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.)
Marconis Wireless Telegraph Co Ltd
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph Co Ltd
Marconi 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 Marconis Wireless Telegraph Co Ltd, Marconi Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Publication of GB419783A publication Critical patent/GB419783A/en
Expired legal-status Critical Current

Links

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

Landscapes

  • Near-Field Transmission Systems (AREA)

Abstract

419,783. Aerials ; wireless receiving systems. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., Electra House, Victoria Embankment, London.-(Assignees of Amalgamated Wireless (Australasia), Ltd. ; 47, York Street, Sydney, Australia.) Feb. 2, 1934, No. 3548. Convention date, Feb. 2, 1933. [Class 40 (v).] An omni-directional receiving system for reducing the effects of locally-produced disturbances, comprises a plurality of angularly disposed loop aerials, balanced electrostatic shielding means surrounding the aerials and means for combining the outputs from the aerials in such relative phase that the receiver responds equally to similar signals received from any direction. As shown, two mutually perpendicular loop aerials 6, 7 are surrounded by non-magnetic metal tubular shields 8, 9 respectively with gaps G therein at the points of intersection and connected to a further shield 10 containing the leads to the receiver R. The input circuit of the receiver comprises a tuned circuit L2, C and a resistance R1 in circuit therewith. The output of one of the loops is fed to a coil L1, inductively coupled to the circuit L2, C and that of the other applied across the resistance R1. The receiver proper may be within an earthed shield 12 connected to the shield 10. In a modification, the two aerials are each connected to a coil inductively coupled to the circuit L2, C, one of the coils being turned and only loosely coupled to the receiver input so that the amplitudes of the two inputs are comparable. In another embodiment switching is introduced to enable the aerial screens to be used themselves as a signal pick-up, in suitable circumstances.
GB3548/34A 1933-02-02 1934-02-02 Improvements in and relating to wireless receiving apparatus Expired GB419783A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AU419783X 1933-02-02

Publications (1)

Publication Number Publication Date
GB419783A true GB419783A (en) 1934-11-19

Family

ID=3729282

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3548/34A Expired GB419783A (en) 1933-02-02 1934-02-02 Improvements in and relating to wireless receiving apparatus

Country Status (1)

Country Link
GB (1) GB419783A (en)

Cited By (8)

* 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
US2468143A (en) * 1944-11-03 1949-04-26 Marguerite P Van Camp Probe for detecting and locating sources of electromagnetic energy
US2485654A (en) * 1946-05-28 1949-10-25 Standard Telephones Cables Ltd Antenna
US2690509A (en) * 1951-02-05 1954-09-28 Toth Emerick Omnidirectional loop antenna system
US3947770A (en) * 1974-07-12 1976-03-30 The United States Of America As Represented By The Secretary Of The Navy Broadband omnidirectional RF field intensity indicating device
US4251808A (en) * 1979-11-15 1981-02-17 Lichtblau G J Shielded balanced loop antennas for electronic security systems
DE3140319A1 (en) * 1981-10-10 1983-04-21 Klaus 3300 Braunschweig Münter Electrically screened broadband antenna for the in-phase detection of the magnetic components of an alternating electromagnetic field
US4816766A (en) * 1985-11-18 1989-03-28 Siemens Aktiengesellschaft Surface coil for examination using a nuclear magnetic resonance apparatus

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2468143A (en) * 1944-11-03 1949-04-26 Marguerite P Van Camp Probe for detecting and locating sources of electromagnetic energy
US2419577A (en) * 1945-03-12 1947-04-29 Standard Telephones Cables Ltd Antenna system
US2485654A (en) * 1946-05-28 1949-10-25 Standard Telephones Cables Ltd Antenna
US2690509A (en) * 1951-02-05 1954-09-28 Toth Emerick Omnidirectional loop antenna system
US3947770A (en) * 1974-07-12 1976-03-30 The United States Of America As Represented By The Secretary Of The Navy Broadband omnidirectional RF field intensity indicating device
US4251808A (en) * 1979-11-15 1981-02-17 Lichtblau G J Shielded balanced loop antennas for electronic security systems
FR2470976A1 (en) * 1979-11-15 1981-06-12 Lichtblau George ARMORED ANTENNAS WITH BALANCED LOOPS FOR ELECTRONIC SECURITY SYSTEMS
DE3140319A1 (en) * 1981-10-10 1983-04-21 Klaus 3300 Braunschweig Münter Electrically screened broadband antenna for the in-phase detection of the magnetic components of an alternating electromagnetic field
US4816766A (en) * 1985-11-18 1989-03-28 Siemens Aktiengesellschaft Surface coil for examination using a nuclear magnetic resonance apparatus

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