Claims
1. An antenna array assembly, comprising:
a ground plate;
a linear array of patch radiator elements disposed in a spaced parallel
5 relationship with a first face of the ground plate; and
a first and second elongate passive radiator each comprising a plurality
of conductive parts each disposed to be generally upstanding in relation to the
first face of the ground plate and being electrically isolated from the ground
plate, the first and second elongate passive radiators being disposed
10 symmetrically on either side of the linear array and parallel to a centre line of
the linear array, on the same side of the ground plate as the linear array,
wherein at least some of the conductive parts of a respective elongate
passive radiator are disposed in an arrangement having parallel ridges and
grooves, in which, in a cross section in a plane parallel to the first face of the
15 ground plate, the ridges extend towards the linear array and the grooves extend
away from the linear array.
2. An antenna array assembly according to claim 1, wherein at least
some of the conductive parts are arranged as alternating first and second
20 substantially planar conductive parts, the first substantially planar conductive
parts being disposed at a first angle to the centre line of the linear array, and the second substantially planar conductive parts being disposed at a second angle to the centre line of the linear array, a transition between adjacent first and second substantially planar conductive parts forming a respective one of the ridges.
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3. An antenna array assembly according to claim 2, wherein the first
and second substantially planar conductive parts are arranged in a zigzag
arrangement in a cross-section taken in a plane parallel to the first face of the
ground plane.
30
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4. An antenna array assembly according to claim 2 or claim 3,
wherein an angle between the first and second substantially planar conductive parts is substantially a right angle.
5 5. An antenna array according to claim 1, wherein at least some of
the conductive parts have a cross-section comprising part of a circle.
6. An antenna array assembly according to any preceding claim,
wherein each patch radiator element is configured to radiate at orthogonal
10 polarisations substantially +/- 45 degrees to the centre line of the linear array.
7. An antenna array assembly according to any preceding claim,
wherein a width of each of the first and second elongate passive radiators
measured in a direction pointing away from the first face of the ground plate is
15 in the range 0.4 to 0.6 wavelengths at a operating frequency of the antenna array
assembly.
8. An antenna array assembly according to any preceding claim,
wherein the width of each of the first and second elongate passive radiators is
20 substantially half a wavelength at at least one operating frequency of the antenna
array assembly.
9. An antenna array assembly according to any preceding claim,
each of the first and second elongate passive radiators is disposed 0.4 to 0.6
25 wavelengths away from a centre line of the linear array of patch radiator
elements at at least one operating frequency of the antenna array assembly, measured in a plane parallel to the first face of the ground plate.
10. An antenna array assembly according to any preceding claim,
30 each of the first and second elongate passive radiators is disposed substantially
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half a wavelength away from a centre line of the linear array of patch radiator elements at at least one operating frequency of the antenna array assembly.
11. An antenna array assembly according to any preceding claim,
5 wherein each of the first and second elongate passive radiators is inclined
towards the linear array of patch radiator elements by an angle of up to 10degrees from perpendicular to the first face of the ground plate.
12. An antenna array assembly according to any preceding claim,
10 wherein each of the first and second elongate passive radiators is composed of a
series of sections, each comprising one or more conductive parts, wherein a gap is provided between each section of 0.2 to 0.4 wavelengths at at least one operating frequency of the antenna array assembly.
15 13. An antenna array assembly according to any preceding claim,
wherein each of the first and second elongate passive radiators is composed of a series of sections, each comprising one or more conductive parts, wherein a gap is provided between each section of substantially a quarter wavelength at at least one operating frequency of the antenna array assembly
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14. An antenna array assembly according to claim 12 or claim 13,
wherein each section has a length measured in a direction parallel to the centre
line of the linear array in the range 0.4 to 0.6 wavelengths at at least one
operating frequency of the antenna array assembly.
25
15. An antenna array assembly according to claim 12 or claim 13,
wherein each section has a length measured in a direction parallel to the centre
line of the linear array of substantially a half wavelength at at least one
operating frequency of the antenna array assembly.
30
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16. An antenna array assembly according to any preceding claim,
wherein at least two ridges of a respective elongate passive radiator are spaced
by between one sixteenth and one quarter of a wavelength at at least one
operating frequency of the antenna array assembly.
5
17. An antenna array assembly according to any preceding claim,
wherein at least two ridges of a respective elongate passive radiator are spaced
by substantially one eight of a wavelength at at least one operating frequency of
the antenna array assembly.
10
18. An antenna array assembly according to any preceding claim,
comprising a first and second elongate conductive wall each being disposed
symmetrically on either side of the linear array and parallel to a centre line of
the linear array, on the same side of the ground plate as the linear array, and
15 closer to the linear array than are the first and second elongate passive radiators,
wherein the first and second elongate conductive walls are electrically connected to the first face of the ground plate and are substantially perpendicular to the first face of the ground plate, protruding from the ground plate by less than a quarter of a wavelength at at least one operating frequency of the antenna array
20 assembly.
19. An antenna array assembly according to any preceding claim,
wherein the ground plate comprises a base plate to which the first and second
elongate passive radiators are mounted and a raised section disposed between
25 the base plate and the patch radiator elements comprising at least part of the first
face of the ground plate.
20. An antenna array assembly according to any preceding claim,
wherein the each patch radiator element comprises a first planar part disposed in
30 a spaced parallel relationship to the first face of the ground plate and a second
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planar part disposed in a spaced parallel relationship to the first planar part, on the side of the first planar part away from the first face of the ground plate.
Jfc^isl--
Dated this 23rd day of May 2019 (J
MAYANK SOOD
IN/PA-1850
OF K & S PARTNERS
AGENT FOR THE APPLICANTS
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