Magnetic pseudo-conductor spiral antennas
First Claim
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1. An antenna based on a magnetic pseudo-conductor material, comprising:
- a ground plane formed of an electrically conductive material;
a spiral antenna structure formed over the ground plane and including a magnetic pseudo-conductive material exhibiting a real part of a permeability greater than a corresponding imaginary part of the permeability while the relative permeability is greater than the relative permittivity of the material, the magnetic pseudo-conductive material being shaped to extend from a center into opposite directions as two spiral antenna arms to form as a spiral having two spiral antenna arm tips at two opposite sides of the spiral and to have a spatially varying permeability along each spiral antenna arm between the center and each spiral antenna arm tip; and
a transmission line formed near the center of the spiral antenna structure to feed an antenna signal with respect to the spiral structure to enable an antenna operation by the ground plane, the spiral antenna structure and the transmission line.
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Abstract
A variable permeability antenna apparatus includes a first region configured for coupling with a feed of a radio frequency signal and a second region for transmitting the radio frequency signal. The permeability of material at the second region is greater than the permeability of material at the first region. Also, a spiral antenna for transmission or reception of radio frequency signals is disclosed.
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Citations
19 Claims
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1. An antenna based on a magnetic pseudo-conductor material, comprising:
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a ground plane formed of an electrically conductive material; a spiral antenna structure formed over the ground plane and including a magnetic pseudo-conductive material exhibiting a real part of a permeability greater than a corresponding imaginary part of the permeability while the relative permeability is greater than the relative permittivity of the material, the magnetic pseudo-conductive material being shaped to extend from a center into opposite directions as two spiral antenna arms to form as a spiral having two spiral antenna arm tips at two opposite sides of the spiral and to have a spatially varying permeability along each spiral antenna arm between the center and each spiral antenna arm tip; and a transmission line formed near the center of the spiral antenna structure to feed an antenna signal with respect to the spiral structure to enable an antenna operation by the ground plane, the spiral antenna structure and the transmission line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An antenna for radio frequency (RF) transmission or reception, comprising:
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a ground plane formed of an electrically conductive material; a first spirally-shaped antenna element located over the ground plane and comprising a pseudo-conductor material, the first antenna element having a first feed end and a first transmit end, wherein permeability of the first spirally-shaped antenna element is spatially varying between the first feed end and the first transmit end, the pseudo-conductor material having an electromagnetic constitutive property having a real part greater than a corresponding imaginary part of the electromagnetic constitutive property; and a second spirally shaped antenna element located over the ground plane and comprising the pseudo-conductor material, the second antenna element having a second feed end coupled to the first feed end of the first spirally-shaped antenna element and a second transmit end, wherein permeability of the second spirally-shaped antenna element is spatially varying between the first feed end and the first transmit end, wherein each of first and second spirally-shaped antenna elements includes a magnetic pseudo-conductive material exhibiting a real part of a permeability greater than a corresponding imaginary part of the permeability while the relative permeability is greater than the relative permittivity of the material. - View Dependent Claims (13, 14, 15, 16)
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17. An antenna for transmitting or receiving radio frequency (RF) signals, comprising:
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a ground plane formed of an electrically conductive material; an antenna element formed over the ground plane and having a first end and a second end, the antenna element comprising a material having a permeability that changes from the first end to the second end, wherein the antenna element includes a magnetic pseudo-conductive material exhibiting a real part of a permeability greater than a corresponding imaginary part of the permeability while the relative permeability is greater than the relative permittivity of the material; a width and the permeability of the antenna element vary from the first end to the second end such that an antenna characteristic is substantially frequency-independent in a frequency band. - View Dependent Claims (18, 19)
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Specification