Built-in radiation structure for a millimeter wave radar sensor
First Claim
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1. A compact radar system including:
- a dielectric substrate having an upper and lower surface;
a ground plane formed on the upper surface of the dielectric substrate and including a radiating slot formed therein;
radar transceiver means located adjacent the lower surface of the dielectric substrate for generating transmit signals; and
a frequency selective surface spaced above said dielectric substrate and said radiating slot and including a radiating aperture with and array of uniformly spaced holes, wherein said frequency selective surface decreases flow of electromagnetic energy from said radiating slot in one direction towards said transceiver means and increases said flow of electromagnetic radiation in an opposite direction away from said transceiver means.
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Abstract
A compact radar system includes a dielectric substrate having an upper and lower surface. A ground plane is formed on the upper surface of the dielectric substrate and includes a radiating slot formed therein. A radar transceiver is located below the dielectric substrate and generates transmit signals. A frequency selective surface spaced above the dielectric substrate includes a radiating aperture with a plurality of uniformly spaced holes. The frequency selective surface decreases flow of electromagnetic energy from the radiating slot in one direction towards the transceiver and increases the flow of electromagnetic radiation in an opposite direction away from the transceiver.
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Citations
36 Claims
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1. A compact radar system including:
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a dielectric substrate having an upper and lower surface; a ground plane formed on the upper surface of the dielectric substrate and including a radiating slot formed therein; radar transceiver means located adjacent the lower surface of the dielectric substrate for generating transmit signals; and a frequency selective surface spaced above said dielectric substrate and said radiating slot and including a radiating aperture with and array of uniformly spaced holes, wherein said frequency selective surface decreases flow of electromagnetic energy from said radiating slot in one direction towards said transceiver means and increases said flow of electromagnetic radiation in an opposite direction away from said transceiver means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A compact radar system including:
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an upper housing with a radome connected to a spacer; a lower housing; a dielectric substrate having an upper and lower surface; a ground plane formed on the upper surface of the dielectric substrate and including a radiating slot and a receiving slot formed therein; radar transceiver means located adjacent the lower surface of the dielectric substrate for generating transmit signals and for receiving reflected transmit signals, wherein said transceiver includes radiating and receiving microstrip feedlines connected to the radiating and receiving slots; a frequency selective surface spaced above the upper surface of said dielectric substrate and said radiating slot and said receiving slot and including a receiving aperture and a radiating aperture each with an array of spaced holes, wherein said frequency selective surface decreases flow of electromagnetic energy from said radiating slot in one direction towards said transceiver means and increases said flow of electromagnetic radiation in an opposite direction away from said transceiver means, and wherein the frequency selective surface matches an impedance of the radiating and receiving microstrip feedlines; means for spacing the frequency selective surface above the ground plane; and a digital signal processing circuit located between the dielectric substrate and the lower housing. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33)
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34. A compact radar system including:
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an upper housing with a radome connected to a spacer; a lower housing; a dielectric substrate having an upper and lower surface; a ground plane formed on the upper surface of the dielectric substrate and including a radiating slot and a receiving slot formed therein; radar transceiver means for generating transmit signals and for receiving reflected signals, wherein said transceiver includes radiating and receiving microstrip feedlines connected to the radiating and receiving slots; a frequency selective surface spaced above said dielectric substrate and said radiating and receiving slots and including a receiving aperture and a radiating aperture each with an array of spaced holes, wherein said frequency selective surface decreases flow of electromagnetic energy from said radiating slot in one direction towards said transceiver means and increases said flow of electromagnetic radiation in an opposite direction away from said transceiver means, wherein at least one of the radiating and receiving apertures are substantially square and at least one of the radiating and receiving slots are formed partially along a diagonal of said at least one of the radiating and receiving apertures, and wherein the frequency selective surface matches an impedance of the radiating microstrip feedlines; means for spacing the frequency selective surface above the ground plane, wherein the spacing means is formed by a plate including radiating and receiving portions which are aligned with the receive and transmit apertures on the frequency selective surface when assembled; a digital signal processing circuit located between the dielectric substrate and the lower housing; and an IF/modulator circuit fabricated on the lower surface of the dielectric substrate. - View Dependent Claims (35, 36)
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Specification