RF/ID transponder with squinted beam radiation pattern using dipole-over-ground plane antenna
First Claim
1. A RF/ID transponder, comprising:
- an integrated circuit package;
a dipole antenna coupled to said integrated circuit package, said dipole antenna having a length greater than one-half wavelength of a electromagnetic wave having a nominal frequency within an operating frequency band of said RF/ID transponder;
a base plate providing an electrically conductive ground plane, said integrated circuit package and said dipole antenna being parallel to and spaced from said ground plane by a predetermined distance, said dipole antenna providing a radiation pattern that includes at least first and second squinted beams extending at respective acute angles relative to a vector defined normal to said conductive ground plane.
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Accused Products
Abstract
An RF/ID transponder comprises an integrated circuit package including at least a memory and an RF modulator. A dipole antenna is coupled to the RF modulator, and has a length greater than one-half wavelength of an electromagnetic wave having a nominal frequency within an operating frequency band of the RF modulator. A base plate provides an electrically conductive ground plane, and a housing is attached to the base plate. The integrated circuit package and the dipole antenna are supported by the housing at a predetermined distance from the conductive ground plane. Thereby, the dipole antenna provides a radiation pattern that includes at least first and second squinted beams extending at respective acute angles relative to a vector defined normal to the conductive ground plane, and at least one center beam extending along the vector defined normal to the conductive ground plane. In a preferred embodiment of the invention, the length of the dipole antenna is approximately one and one-half wavelengths at the nominal frequency, and the housing supports the dipole antenna above the conducting ground plane at a distance of approximately 6 to 12 percent of a wavelength of the nominal frequency.
92 Citations
27 Claims
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1. A RF/ID transponder, comprising:
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an integrated circuit package; a dipole antenna coupled to said integrated circuit package, said dipole antenna having a length greater than one-half wavelength of a electromagnetic wave having a nominal frequency within an operating frequency band of said RF/ID transponder; a base plate providing an electrically conductive ground plane, said integrated circuit package and said dipole antenna being parallel to and spaced from said ground plane by a predetermined distance, said dipole antenna providing a radiation pattern that includes at least first and second squinted beams extending at respective acute angles relative to a vector defined normal to said conductive ground plane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A RF/ID transponder, comprising:
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an integrated circuit package; and means for radiating RF energy from said integrated circuit package in a radiation pattern that includes at least three distinct beams extending in different relative directions. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification