Dual polarized slotted array antenna
First Claim
1. A waveguide slot radiator, comprising:
- an input slot for communicating electromagnetic signals, the input slot having a top opening and a bottom opening;
an output slot for communicating the electromagnetic signals;
a cavity section comprising a cavity, a first opening positioned adjacent to the top opening of the input slot and a second opening positioned adjacent to the output slot, the cavity section connecting the first opening and the second opening and operative to rotate an electromagnetic field polarization of the electromagnetic signals from a first polarization state to a second polarization state; and
a ridged waveguide, the ridged waveguide having a broad wall and an opposing ridge wall comprising a ridge;
wherein the bottom opening of the input slot is positioned adjacent to the ridge wall of the ridged waveguide.
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Accused Products
Abstract
A waveguide-implemented antenna comprising a planar array of waveguide slot radiators for communicating electromagnetic signals exhibiting simultaneous dual polarization states. The antenna can consist of parallel ridged waveguides having rectangular or "T"-shaped ridged cross sections. The ridged walls of each parallel ridged waveguide contain a linear array of input slots for receiving (transmitting) electromagnetic signals having a first polarization state from (to) the parallel ridged waveguides and for transmitting (receiving) those signals into (from) a corresponding array of cavity sections. The cavity sections comprise a short section of uniform waveguide with a thickness of much less than a wavelength in the propagation direction. The cavity sections feed to output slots which are rotated relative to the input slots; such that the output slots exhibit a second polarization state, which they radiate (receive) to (from) free space. By interlacing parallel ridged waveguides with alternating +45 degree and -45 degree rotations of the output slots, two independent antennas are formed exhibiting simultaneous dual polarizations. Because the input slots are located in the ridge wall of the parallel ridged waveguides, the parallel ridged waveguides can be fed from their broad wall side. Feeding the parallel ridged waveguides from their broad wall side eliminates a need for a complex feed network.
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Citations
33 Claims
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1. A waveguide slot radiator, comprising:
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an input slot for communicating electromagnetic signals, the input slot having a top opening and a bottom opening; an output slot for communicating the electromagnetic signals; a cavity section comprising a cavity, a first opening positioned adjacent to the top opening of the input slot and a second opening positioned adjacent to the output slot, the cavity section connecting the first opening and the second opening and operative to rotate an electromagnetic field polarization of the electromagnetic signals from a first polarization state to a second polarization state; and a ridged waveguide, the ridged waveguide having a broad wall and an opposing ridge wall comprising a ridge; wherein the bottom opening of the input slot is positioned adjacent to the ridge wall of the ridged waveguide. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A ridged waveguide-implemented antenna, comprising:
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a plurality of parallel ridged waveguide structures, each ridged waveguide structure comprising a ridged waveguide defined by a broad wall and an opposing ridge wall, the broad wall and the ridge wall connected to a first side wall and a second side wall, each ridged waveguide corresponding to at least one waveguide slot radiator, each waveguide slot radiator comprising; an input slot for communicating electromagnetic signals, the input slot positioned adjacent the ridge wall of each ridged waveguide; an output slot for communicating the electromagnetic signals; and a cavity having a first opening positioned adjacent the input slot and a second opening positioned adjacent the output slot, the cavity being operative to pass the electromagnetic signals between the input slot and the output slot and being further operative to rotate an electromagnetic field polarization from a first polarization state to a second polarization state. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A ridged waveguide implemented antenna, comprising:
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a single antenna structure comprising a first antenna interlaced with a second antenna; the first antenna comprising a planar array of ridged waveguide slot radiators, each radiator comprising; a first input slot for communicating electromagnetic signals, the first input slot having a top opening and a bottom opening, a first output slot for communicating the electromagnetic signals, a first cavity section comprising a first cavity, a first opening positioned adjacent to the top opening of the first input slot and a second opening positioned adjacent to the first output slot, the first cavity section connecting the first opening and the second opening and operative to rotate the electromagnetic field polarization of the electromagnetic signals from a first polarization state to a second polarization state, and a first ridged waveguide, the first ridged waveguide having a first broad wall and an opposing first ridge wall, the first ridge wall comprising a first ridge, wherein the bottom opening of the first input slot is positioned adjacent to the first ridge wall of the first ridged waveguide; and the second antenna comprising a second planar array of ridged waveguide slot radiators, each radiator comprising; a second input slot for communicating the electromagnetic signals, the second input slot having a top opening and a bottom opening, a second output slot for communicating the electromagnetic signals, a second cavity section comprising a second cavity, a third opening positioned adjacent to the top opening of the second input slot and a fourth opening positioned adjacent to the second output slot, the second cavity section connecting the third opening and the fourth opening and operative to rotate the electromagnetic field polarization of the electromagnetic signals from a first polarization state to a second polarization state, and a second ridged waveguide, the second ridged waveguide having a second broad wall and an opposing second ridge wall, the second ridge wall comprising a second ridge, wherein the bottom opening of the second input slot is positioned adjacent to the second ridge wall of the second ridged waveguide. - View Dependent Claims (31, 32, 33)
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Specification