Planar array antenna
First Claim
1. An antenna element (3) comprising:
- a horn (12) having a central cavity and edges (13) defining a substantially rectangular shaped aperture, a substantially rectangular waveguide (15) coaxial with and having an opening connected to the central cavity of the horn (12), a first probe (17) provided within the rectangular waveguide (15) for transmitting and/or receiving a first signal linearly polarised in a first direction, and a second probe (20) provided within the rectangular waveguide (15) for transmitting and/or receiving a second signal linearly polarised in a second direction, wherein the first and second signals have different operating frequencies, the first and second directions are orthogonal and the edges (13) of the horn aperture (12) are at an angle of 45°
to the directions of polarisation of the first and second signals.
1 Assignment
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Accused Products
Abstract
A flat plate or slab antenna (1) is fabricated from a number of sandwiched layers in which a number of arrayed individual antenna elements (3) are formed. The antenna elements (3) each include a horn (12) with a rectangular aperture (13) feeding (or fed by) individual rectangular waveguides (15). Two orthogonal probes (17,20) protrude into each waveguide (13), each of which is connected to respective beamforming networks. The network of first probes (17) operates at a first frequency while the network of second probes (20) operates at a frequency which is different from the first frequency. In the preferred embodiment, the edges (13) of the horn apertures (12) are parallel to the sides (6, 7, 8, 9) of the antenna slab while the walls of the rectangular waveguides are at 45° to the sides (6, 7, 8, 9) of the slab. The antenna (1) is able to receive and/or transmit two orthogonally linearly polarised signal at different frequencies and is therefore capable of full duplex operation. Various additional features are also described which reduce coupling between the first (17) and second (20) probes, improve isolation between receiving and transmitting sections and maximise power dissipation within the structure.
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Citations
10 Claims
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1. An antenna element (3) comprising:
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a horn (12) having a central cavity and edges (13) defining a substantially rectangular shaped aperture, a substantially rectangular waveguide (15) coaxial with and having an opening connected to the central cavity of the horn (12), a first probe (17) provided within the rectangular waveguide (15) for transmitting and/or receiving a first signal linearly polarised in a first direction, and a second probe (20) provided within the rectangular waveguide (15) for transmitting and/or receiving a second signal linearly polarised in a second direction, wherein the first and second signals have different operating frequencies, the first and second directions are orthogonal and the edges (13) of the horn aperture (12) are at an angle of 45°
to the directions of polarisation of the first and second signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification