Structure of aperture antenna and radar system using same
First Claim
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1. An aperture antenna comprising:
- an electromagnetic wave converging device;
at least three primary radiators disposed on a focal plane of said electromagnetic wave converging device; and
a feeding circuit that feeds electromagnetic signals to an adjacent two of said primary radiators to radiate in phase electromagnetic waves and that extracts signals received by the adjacent two of said primary radiators separately.
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Abstract
An aperture antenna suitable for a radar system of an automotive vehicle is provided which includes three or more primary radiators and a feeding circuit. The feeding circuit is designed to supply electromagnetic signals to adjacent two of the primary radiators through discrete feeders to radiate in phase electromagnetic waves and to extract signals received by the two of the primary radiators separately. This enables the radiation of radar waves over a wider area without increasing the radiation power.
55 Citations
9 Claims
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1. An aperture antenna comprising:
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an electromagnetic wave converging device; at least three primary radiators disposed on a focal plane of said electromagnetic wave converging device; and a feeding circuit that feeds electromagnetic signals to an adjacent two of said primary radiators to radiate in phase electromagnetic waves and that extracts signals received by the adjacent two of said primary radiators separately. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A radar system comprising:
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an aperture antenna including an electromagnetic wave converging device and at least three primary radiators disposed on a focal plane of the electromagnetic wave converging device; a high-frequency oscillator that supplies high-frequency signals to said primary radiators through first and second common feeders to radiate in phase radar waves; first and second signal separating circuits that are connected to said first and second common feeders, respectively, each of the first and second signal separating circuits separating signals appearing on one of the first and second common feeders into the high-frequency signal supplied from said high-frequency oscillator and a signal received by said aperture antenna; first and second mixers that are connected to said first and second signal separating circuits, respectively, each of said first and second mixers mixing the high-frequency signal and the received signal separated by one of said first and second signal separating circuits to produce a beat signal; and a circuit that establishes electrical connections between an adjacent two of the primary radiators and said first and second common feeders, respectively, to radiate the in phase radar waves from the adjacent two of the primary radiators and that determines a position of a target reflecting the radar waves radiated from said primary radiators based on the beat signals produced by said first and second mixers.
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Specification