GB0105480D0 - Structures with magnetic properties - Google Patents

Structures with magnetic properties

Info

Publication number
GB0105480D0
GB0105480D0 GB0105480A GB0105480A GB0105480D0 GB 0105480 D0 GB0105480 D0 GB 0105480D0 GB 0105480 A GB0105480 A GB 0105480A GB 0105480 A GB0105480 A GB 0105480A GB 0105480 D0 GB0105480 D0 GB 0105480D0
Authority
GB
United Kingdom
Prior art keywords
magnetic permeability
magnetic
array
imaging apparatus
resonance imaging
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Withdrawn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
GB0105480A
Other versions
GB2373102A (en
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.)
Marconi Caswell Ltd
Original Assignee
Marconi Caswell 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 Marconi Caswell Ltd filed Critical Marconi Caswell Ltd
Priority to GB0105480A priority Critical patent/GB2373102A/en
Publication of GB0105480D0 publication Critical patent/GB0105480D0/en
Priority to PCT/GB2002/000734 priority patent/WO2002071544A1/en
Publication of GB2373102A publication Critical patent/GB2373102A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/42—Screening
    • G01R33/422—Screening of the radio frequency field
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
    • H01Q15/006—Selective devices having photonic band gap materials or materials of which the material properties are frequency dependent, e.g. perforated substrates, high-impedance surfaces
    • H01Q15/008—Selective devices having photonic band gap materials or materials of which the material properties are frequency dependent, e.g. perforated substrates, high-impedance surfaces said selective devices having Sievenpipers' mushroom elements

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Health & Medical Sciences (AREA)
  • Epidemiology (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)

Abstract

A surface structure with preselected magnetic permeability in the plane of the surface comprises an array of elements consisting of multi-turn helical loops made for example by tracks 10, 11 on a printed circuit board plated through for example by vias 13 and with the possible addition of a parallel capacitance 14, the pitch of the array being much less than the wavelength of the electromagnetic radiation to which the surface exhibits predetermined values of magnetic permeability, which can range from negative values such as -1 to 0 and to positive values greater than 1. The latter act as a duct for magnetic flux allowing receive coils and magnetic resonance imaging apparatus to be spaced from the surface of a patient and also to allow for screening purposes within magnetic resonance imaging apparatus. A value of magnetic permeability of-1 enables the surface structure to be used as a reflecting surface.
GB0105480A 2001-03-06 2001-03-06 Structures with magnetic properties Withdrawn GB2373102A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB0105480A GB2373102A (en) 2001-03-06 2001-03-06 Structures with magnetic properties
PCT/GB2002/000734 WO2002071544A1 (en) 2001-03-06 2002-02-20 Structures with magnetic properties

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0105480A GB2373102A (en) 2001-03-06 2001-03-06 Structures with magnetic properties

Publications (2)

Publication Number Publication Date
GB0105480D0 true GB0105480D0 (en) 2001-04-25
GB2373102A GB2373102A (en) 2002-09-11

Family

ID=9910058

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0105480A Withdrawn GB2373102A (en) 2001-03-06 2001-03-06 Structures with magnetic properties

Country Status (2)

Country Link
GB (1) GB2373102A (en)
WO (1) WO2002071544A1 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2859309B1 (en) * 2003-09-02 2005-12-16 Commissariat Energie Atomique HIGH IMPEDANCE SUBSTRATE
US7794629B2 (en) 2003-11-25 2010-09-14 Qinetiq Limited Composite materials
JP4795344B2 (en) * 2004-07-23 2011-10-19 ザ リージェンツ オブ ザ ユニバーシティ オブ カリフォルニア Metamaterial
US20080105826A1 (en) * 2005-01-18 2008-05-08 Mercure Peter K Structures Useful in Creating Composite Left-Hand-Rule Media
WO2008078284A2 (en) 2006-12-22 2008-07-03 Koninklijke Philips Electronics N.V. Rf coil for use in an mr imaging system, in combination with a metamaterial
US20100073000A1 (en) * 2008-09-22 2010-03-25 Insight Neuroimaging Systems, Llc Radio frequency coil apparatus and methods
EP2390953A1 (en) * 2010-05-25 2011-11-30 Kildal Antenn Consulting AB Packaging of active and passive microwave circuits using lid or bed of curved posts

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9900034D0 (en) * 1999-01-04 1999-02-24 Marconi Electronic Syst Ltd Structure with magnetic properties
US6603357B1 (en) * 1999-09-29 2003-08-05 Innovative Technology Licensing, Llc Plane wave rectangular waveguide high impedance wall structure and amplifier using such a structure
GB2360137A (en) * 2000-03-06 2001-09-12 Marconi Caswell Ltd Guides for RF magnetic flux
GB2363845A (en) * 2000-06-21 2002-01-09 Marconi Caswell Ltd Focussing RF flux

Also Published As

Publication number Publication date
GB2373102A (en) 2002-09-11
WO2002071544A1 (en) 2002-09-12

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)