Resonant Reflector Assembly and Method
First Claim
1. A resonant radar reflector assembly comprising first and second reflector members, the first and second reflector members each being configured to resonate at a respective resonant frequency when irradiated by radio frequency (RF) radiation of a corresponding frequency,wherein the first member has a portion responsive to an electric field applied parallel to an electric polarisation axis of the first member, the second member having a corresponding portion responsive to an electric field applied parallel to a corresponding electric polarisation axis of the second member,the first member also having a portion responsive to a magnetic field applied parallel to a magnetic polarisation axis of the first member, the second member having a corresponding portion responsive to a magnetic field applied parallel to a corresponding magnetic polarisation axis of the second member,the first and second members being arranged such that at least one electric or magnetic polarisation axis of the first member is substantially not parallel to the corresponding electric or magnetic polarisation axis of the second member;
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3 Assignments
0 Petitions
Accused Products
Abstract
A resonant radar reflector assembly comprising first and second reflector members (110A, 110B), the first and second and reflector members each being configured to resonate at their respective resonant frequency when irradiated by radio frequency (RF) radiation of a corresponding frequency, wherein the first member has a portion (114A) responsive to an electric field applied parallel to an electric polarisation axis of the first member, the second member having a corresponding portion (114B) responsive to an electric field applied parallel to a corresponding electric polarisation axis of the second member, the first member also having a portion (112A) responsive to a magnetic field applied parallel to a magnetic polarisation axis of the first member, the second member having a corresponding portion (112B) responsive to a magnetic field applied parallel to a corresponding magnetic polarisation axis of the second member, the first and second members being arranged such that at least one electric or magnetic polarisation axis of the first member is substantially not parallel to the corresponding electric or magnetic polarisation axis of the second member.
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Citations
51 Claims
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1. A resonant radar reflector assembly comprising first and second reflector members, the first and second reflector members each being configured to resonate at a respective resonant frequency when irradiated by radio frequency (RF) radiation of a corresponding frequency,
wherein the first member has a portion responsive to an electric field applied parallel to an electric polarisation axis of the first member, the second member having a corresponding portion responsive to an electric field applied parallel to a corresponding electric polarisation axis of the second member, the first member also having a portion responsive to a magnetic field applied parallel to a magnetic polarisation axis of the first member, the second member having a corresponding portion responsive to a magnetic field applied parallel to a corresponding magnetic polarisation axis of the second member, the first and second members being arranged such that at least one electric or magnetic polarisation axis of the first member is substantially not parallel to the corresponding electric or magnetic polarisation axis of the second member; - and
wherein a resonant frequency of the first member is different to a resonant frequency of the second member, the members being arranged to reflect electromagnetic radiation of different respective prescribed frequencies. - View Dependent Claims (2, 5, 7, 8, 11, 12, 14, 15, 20, 23, 26, 31, 32, 33, 34)
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41. A method of identifying an article comprising the steps of:
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providing a resonant radar reflector assembly comprising first and second reflector members, the first and second reflector members each being configured to resonate at their respective resonant frequency when irradiated by radio frequency (RE) radiation of a corresponding frequency, wherein the first member has a portion responsive to an electric field applied parallel to an electric polarisation axis of the first member, the second member having a corresponding portion responsive to an electric field applied parallel to a corresponding polarisation axis of the second member, the first member also having a portion responsive to a magnetic field applied parallel to a magnetic polarisation axis of the first member, the second member having a corresponding portion responsive to a magnetic field applied parallel to a corresponding magnetic polarisation axis of the second member, wherein a resonant frequency of the first reflector member is different from a resonant frequency of the second reflector member; the first and second members being arranged such that at least one electric or magnetic polarisation axis of the first member is substantially not parallel to the corresponding electric or magnetic polarisation axis of the second member; irradiating the assembly with RF radiation including radiation of a frequency corresponding to the resonant frequency of the first and second reflector members; detecting radiation reflected by the assembly; and measuring the resonant frequency of the first and second reflector members. - View Dependent Claims (43, 45)
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47. A method of identifying an article comprising the steps of:
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providing a resonant radar reflector assembly comprising first and second reflector members, the first and second reflector members being configured to resonate at a resonant frequency when irradiated by radio frequency (RF) radiation of a corresponding frequency, the first and second reflector members each having a dipole portion, at least one of the members further having a loop portion, each member having a polarisation axis, the members being arranged whereby the polarisation axis of the first member is substantially not parallel to the polarisation axis of the second member; wherein a resonant frequency of the first reflector member is different from a resonant frequency of the second reflector member; and irradiating the assembly with RF radiation including radiation of a frequency corresponding to the resonant frequency of at least one of the first and second reflector members; and
detecting radiation reflected by the assembly.
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Specification