Low-profile parasitically-coupled patch antenna
AssigneeTrimble Inc.
InventorNuri Celik
Life of this patent
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Abstract
A parasitically-coupled dual-band patch antenna is described. The antenna includes an inner conductor having one or more feed holes. The antenna also includes an outer conductor surrounding the inner conductor in a radial direction. The antenna further includes one or more feeds each having a vertical portion that passes through the feed holes and a horizontal portion that extends in an outward direction from the feed holes toward the outer conductor. The feeds are conductively connected to the outer conductor. The horizontal portion of each of the feeds is separated from and is conductively disconnected from a top surface of the inner conductor.
Claims20
An antenna structure comprising:
- an inner conductor forming a high-frequency patch operable to receive radio waves at an upper frequency band;
- an outer conductor surrounding the inner conductor in a radial direction, the outer conductor forming a low-frequency patch operable to receive radio waves at a lower frequency band;
- one or more feeds conductively connected to the outer conductor;
- and
- a filter disposed along an outer edge of the outer conductor, wherein the filter is configured to at least partially block electrical signals at an intermediate frequency band, and wherein the filter provides an impedance that reflects the electrical signals at the intermediate frequency band to create a standing wave behavior on the outer conductor that substantially prevents radiation at a resonant frequency of the filter.
A global navigation satellite system (GNSS) receiver comprising:
- an antenna configured to receive radio waves at GNSS frequencies, the antenna comprising:
- an inner conductor forming a high-frequency patch operable to receive radio waves at an upper frequency band;
- an outer conductor surrounding the inner conductor in a radial direction, the outer conductor forming a low-frequency patch operable to receive radio waves at a lower frequency band;
- at least one feed conductively connected to the outer conductor;
- and
- a filter physically and conductively connected to an outer edge of the outer conductor, the filter comprising at least one capacitive element and at least one inductive element configured as a parallel circuit, wherein the filter is configured to at least partially block electrical signals at an intermediate frequency band to create a standing wave behavior on the outer conductor that prevents radiation at a resonant frequency of the parallel circuit.
A method of operating a dual-band patch antenna, the method comprising:
- receiving, by a high-frequency patch of the antenna, radio waves at an upper frequency band, wherein the high-frequency patch is formed by an inner conductor;
- receiving, by a low-frequency patch of the antenna, radio waves at a lower frequency band, wherein the low-frequency patch is formed by an outer conductor surrounding the inner conductor in a radial direction;
- carrying, using one or more feeds conductively connected to the outer conductor, the radio waves at the upper frequency band received by the high-frequency patch and the radio waves at the lower frequency band received by the low-frequency patch;
- and
- filtering electrical signals using a filter disposed along an outer edge of the outer conductor, wherein the filtering includes passing the electrical signals at the lower frequency band and at least partially blocking the electrical signals at an intermediate frequency band, wherein blocking the electrical signals at the intermediate frequency band comprises reflecting the electrical signals to create a standing wave behavior on the outer conductor that prevents radiation at a resonant frequency of the filter.
Dependencies are inferred from the claim text.