| 主权项 |
1. An active electronically scanned array antenna comprising:
(a) an active array, configured for radiating and receiving radiofrequency (RF) signals through first radiating openings that lie on a ground plane; (b) a dielectric cover configured to act as both a wide-angle impedance matcher and as protection for the active electronically scanned array antenna, the dielectric cover parallel to the ground plane and spaced apart from the ground plane at a given distance to form an air gap between the dielectric cover and the ground plane; and (c) a plurality of calibration devices operable for calibrating said active electronically scanned array antenna; (d) wherein each calibration device comprises a respective radiating portion, a respective transition portion, and a respective middle portion; (e) wherein for each calibration device:
(1) the respective radiating portion is arranged between the dielectric cover and the ground plane, is oriented parallel to the ground plane, and comprises a respective first waveguide ending, at a first end, with a respective second radiating opening that
gives out onto the air gap towards corresponding first radiating openings,is perpendicular to the ground plane, andis and configured for receiving RF signals radiated through said corresponding first radiating openings and for radiating RF signals in the air gap towards said corresponding first radiating openings;(2) the respective transition portion is oriented perpendicularly to the respective radiating portion and comprises a respective second waveguide and a respective third waveguide cascaded thereto;(3) the respective middle portion is curved at 90 degrees and comprises a respective fourth waveguide coupled, at one end, to the respective third waveguide and, at the other end, to a second end of the respective first waveguide;(4) the respective first waveguide, the respective third waveguide and the respective fourth waveguide have
the same given width depending on an operating frequency of the calibration device, andthe same given height to enable the respective radiating portion to be arranged between the dielectric cover and the ground plane; and(5) the respective second waveguide is coupled through a respective SMA connector to a signal source to receive therefrom the radio frequency signals to be radiated, the respective second waveguide having said given width and a height greater than said given height. |
