Slot array antenna and radar having the slot array antenna
First Claim
Patent Images
1. A slot array antenna comprising:
- a first electrically conductive member having a first electrically conductive surface and a plurality of slots arranged in a first direction along the first electrically conductive surface;
a second electrically conductive member having a second electrically conductive surface that opposes the first electrically conductive surface;
a waveguide member being interposed between the first and second electrically conductive members and having an electrically-conductive waveguide face that opposes the first or second electrically conductive surface, the waveguide member extending alongside the first or second electrically conductive surface; and
an artificial magnetic conductor extending around the waveguide member, wherein,the waveguide face, the first or second electrically conductive surface opposing the waveguide face, and the artificial magnetic conductor define a waveguide;
the waveguide member includesa stem extending along a direction,a first joint portion and a second joint portion branching out from an end of the stem, the first and second joint portions each extending into a region between two adjacent slots among the plurality of slots,a first branch connected to an end of the first joint portion, the first branch extending from the end of the first joint portion in the first direction and coupling to one or more of the plurality of slots, anda second branch connected to an end of the second joint portion, the second branch extending from the end of the second joint portion in an opposite direction of the first direction and coupling to other one or more of the plurality of slots;
each of the plurality of slots intersects the waveguide member or splits the waveguide member;
the end of the stem is not located in the region between the two slots as viewed perpendicularly to the first electrically conductive surface; and
a length of the first joint portion as measured along the waveguide is not equal to a length of the second joint portion as measured along the waveguide.
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Accused Products
Abstract
A slot array antenna includes: a first conductive member having a first conductive surface and a plurality of slots arranged in a first direction; a second conductive member having a second conductive surface that opposes the first conductive surface; a waveguide member having a waveguide face that extends so as to oppose one of the first and second conductive surfaces; and an artificial magnetic conductor extending around the waveguide member. The waveguide member includes: a stem extending along a direction; first and second joint portions branching out from an end of the stem and extending into a region between two adjacent slots; a first branch extending in the first direction from an end of the first joint portion and coupling to some slots; and a second branch extending from an end of the second joint portion in an opposite direction of the first direction and coupling to other slots.
48 Citations
26 Claims
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1. A slot array antenna comprising:
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a first electrically conductive member having a first electrically conductive surface and a plurality of slots arranged in a first direction along the first electrically conductive surface; a second electrically conductive member having a second electrically conductive surface that opposes the first electrically conductive surface; a waveguide member being interposed between the first and second electrically conductive members and having an electrically-conductive waveguide face that opposes the first or second electrically conductive surface, the waveguide member extending alongside the first or second electrically conductive surface; and an artificial magnetic conductor extending around the waveguide member, wherein, the waveguide face, the first or second electrically conductive surface opposing the waveguide face, and the artificial magnetic conductor define a waveguide; the waveguide member includes a stem extending along a direction, a first joint portion and a second joint portion branching out from an end of the stem, the first and second joint portions each extending into a region between two adjacent slots among the plurality of slots, a first branch connected to an end of the first joint portion, the first branch extending from the end of the first joint portion in the first direction and coupling to one or more of the plurality of slots, and a second branch connected to an end of the second joint portion, the second branch extending from the end of the second joint portion in an opposite direction of the first direction and coupling to other one or more of the plurality of slots; each of the plurality of slots intersects the waveguide member or splits the waveguide member; the end of the stem is not located in the region between the two slots as viewed perpendicularly to the first electrically conductive surface; and a length of the first joint portion as measured along the waveguide is not equal to a length of the second joint portion as measured along the waveguide. - View Dependent Claims (3, 5, 6, 7, 8, 9, 10, 12, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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2. A slot array antenna for use in at least one of transmission and reception of an electromagnetic wave of a predetermined band, the slot array antenna comprising:
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a first electrically conductive member having a first electrically conductive surface and a plurality of slots arranged in a first direction along the first electrically conductive surface; a second electrically conductive member having a second electrically conductive surface that opposes the first electrically conductive surface; a waveguide member being interposed between the first and second electrically conductive members and having an electrically-conductive waveguide face that opposes the first or second electrically conductive surface, the waveguide member extending alongside the first or second electrically conductive surface; and an artificial magnetic conductor extending around the waveguide member, wherein, the waveguide face, the first or second electrically conductive surface opposing the waveguide face, and the artificial magnetic conductor define a waveguide; the waveguide member includes a stem extending along a direction, a first joint portion and a second joint portion branching out from an end of the stem, the first and second joint portions each extending into a region between two adjacent slots among the plurality of slots, a first branch connected to an end of the first joint portion, the first branch extending from the end of the first joint portion in the first direction and coupling to one or more of the plurality of slots, and a second branch connected to an end of the second joint portion, the second branch extending from the end of the second joint portion in an opposite direction of the first direction and coupling to other one or more of the plurality of slots; each of the plurality of slots intersects the waveguide member or splits the waveguide member; the end of the stem is not located in the region between the two slots as viewed perpendicularly to the first electrically conductive surface; and a difference between a phase variation to occur when an electromagnetic wave of the band propagates from the end of the stem to a closest slot to the first joint portion and a phase variation to occur when the electromagnetic wave propagates from the end of the stem to a closest slot to the second joint portion is greater than π
/4 and smaller than (¾
)π
. - View Dependent Claims (4, 11, 13)
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Specification
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Current AssigneeNidec Corporation, Wgr Co., Ltd.
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Original AssigneeNidec Corporation
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InventorsKamo, Hiroyuki, Kirino, Hideki
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Primary Examiner(s)Levi, Dameon E
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Assistant Examiner(s)Lotter, David E
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Application NumberUS15/923,053Publication NumberTime in Patent Office508 DaysField of SearchUS Class CurrentCPC Class CodesH01P 1/211 Waffle-iron filters; Corrug...H01P 5/12 Coupling devices having mor...H01Q 1/3233 particular used as part of ...H01Q 13/02 Waveguide hornsH01Q 13/10 Resonant slot antennasH01Q 21/064 using horn or slot aerials ...
