GB490383A - Improvements in or relating to antennae for radio transmission and reception - Google Patents

Improvements in or relating to antennae for radio transmission and reception

Info

Publication number
GB490383A
GB490383A GB444437A GB444437A GB490383A GB 490383 A GB490383 A GB 490383A GB 444437 A GB444437 A GB 444437A GB 444437 A GB444437 A GB 444437A GB 490383 A GB490383 A GB 490383A
Authority
GB
Grant status
Application
Patent type
Prior art keywords
loop
loops
segments
0à29
excited
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
GB444437A
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.)
BAE Systems Electronics Ltd
Original Assignee
BAE Systems Electronics 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

Links

Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00Loop 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

Abstract

490,383. Aerials. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Feb. 15, 1937, No. 4444. Convention date, Feb. 15, 1936. [Class 40 (v)] Loop aerials for broadcasting or receiving horizontally polarized ultra - short waves with maximum field strength in the horizontal plane have a radius a which bears such a ratio to the wavelength A that J1(2#a/#) is a maximum or minimum; thus a may be 0À29 #, 0À85 #, 1À36 A, 1À86 # ... in correspondence with successive maxima and minima of the Bessel function. Condensers C may be inserted for partially tuning the loop and for ensuring uniform current-distribution, the segments of the loop being excited in opposite phase. There may be a single loop with radius 0À29 #, Fig. 1 (not shown), or a series of loops, Fig. 2, whose radii have the above values, may be arranged in one plane, adjacent loops being excited in opposite phase. Several loops, Fig. 3, or several sets of coplanar loops may be arranged one above the other at intervals of at least half a wavelength. The segments of a loop may be energized by separate feed lines, which may be connected near the middle of the segments, Fig. 4 (not shown), or at their ends ; or the loops may be formed with re-entrant portions 12, Fig. 5, for the purpose of giving approximately uniform and unidirectional current in the radiating sections 8, whose length must not exceed ¢ #.
GB444437A 1936-02-15 1937-02-15 Improvements in or relating to antennae for radio transmission and reception Expired GB490383A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US490383X true 1936-02-15 1936-02-15

Publications (1)

Publication Number Publication Date
GB490383A true true GB490383A (en) 1938-08-15

Family

ID=21957727

Family Applications (1)

Application Number Title Priority Date Filing Date
GB444437A Expired GB490383A (en) 1936-02-15 1937-02-15 Improvements in or relating to antennae for radio transmission and reception

Country Status (1)

Country Link
GB (1) GB490383A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2166000A (en) * 1984-10-24 1986-04-23 Electronic Indentification Sys A system for transmission of high-frequency electromagnetic signals
EP1494311A1 (en) * 2003-07-02 2005-01-05 Sensormatic Electronics Corporation Phase compensated far-field-cancelling nested loop antenna
WO2006109229A1 (en) * 2005-04-15 2006-10-19 Koninklijke Philips Electronics N.V. Antenna for picking up magnetic resonance signals and provided with its own communication unit
WO2007084510A1 (en) * 2006-01-18 2007-07-26 Impinj, Inc. Discontinuous-loop rfid reader antenna and methods
WO2011015511A1 (en) * 2009-08-07 2011-02-10 Siemens Aktiengesellschaft An antenna for radio frequency identification systems, methods of configuring same, and a radio frequency identification reader
GB2553093A (en) * 2016-08-17 2018-02-28 Drayson Tech Europe Limited Antenna for harvesting RF energy and method of designing an antenna

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2166000A (en) * 1984-10-24 1986-04-23 Electronic Indentification Sys A system for transmission of high-frequency electromagnetic signals
EP1494311A1 (en) * 2003-07-02 2005-01-05 Sensormatic Electronics Corporation Phase compensated far-field-cancelling nested loop antenna
WO2006109229A1 (en) * 2005-04-15 2006-10-19 Koninklijke Philips Electronics N.V. Antenna for picking up magnetic resonance signals and provided with its own communication unit
US7667463B2 (en) 2005-04-15 2010-02-23 Koninklijke Philips Electronics N.V. Antenna for picking up magnetic resonance signals and provided with its own communication unit
CN100591267C (en) 2005-04-15 2010-02-24 皇家飞利浦电子股份有限公司 Antenna for picking up magnetic resonance signals and provided with its own communication unit
WO2007084510A1 (en) * 2006-01-18 2007-07-26 Impinj, Inc. Discontinuous-loop rfid reader antenna and methods
WO2011015511A1 (en) * 2009-08-07 2011-02-10 Siemens Aktiengesellschaft An antenna for radio frequency identification systems, methods of configuring same, and a radio frequency identification reader
GB2553093A (en) * 2016-08-17 2018-02-28 Drayson Tech Europe Limited Antenna for harvesting RF energy and method of designing an antenna

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