Phased array antenna for satellite communication

Abstract

This invention provides a phased array antenna for satellite communication, comprising a first layer of stacked antenna radiating elements, a second layer of stepped frequency selective surface elements, a third layer of main antenna radiating elements, a fourth layer of frequency selective surface elements, a fifth layer of stepped frequency selective surface elements, a sixth layer of signal line grounding elements, and a controller. The sixth layer of signal line grounding elements includes a plurality of paired communication ports electrically connected to the first antenna element of the first layer of stacked antenna radiating elements and the second antenna element of the third layer of main antenna radiating elements. The controller switches between left-hand circularly polarized and right-hand circularly polarized radiation patterns by feeding equally segmented angular phase difference signals to different first antenna elements and second antenna elements.

Claims

1. A phased array antenna for satellite communication, comprising: A first-layer stacked antenna radiating element, comprising a plurality of first antenna elements to form a first square array; A second-layer stepped frequency selective surface element, stacked on top of the first-layer stacked antenna radiating element, is used for frequency filtering and modifying circular polarization patterns; a third-layer main antenna radiating element, stacked on top of the second-layer stepped frequency selective surface element, includes multiple second antenna elements to form a second square array; a fourth-layer frequency selective surface element, stacked on top of the third-layer main antenna radiating element; a fifth-layer stepped frequency selective surface element, stacked on top of the fourth-layer frequency selective surface element, is used for frequency filtering and modifying circular polarization patterns; a sixth-layer element with signal line grounding, stacked on top of the fifth-layer stepped frequency selective surface element; and a controller connected to the sixth-layer element with signal line grounding, and electrically connected to the first-layer stacked antenna radiating element and the third-layer main antenna radiating element through the sixth-layer element with signal line grounding. The sixth layer, including signal line grounding elements, includes a plurality of paired communication ports electrically connected to the first antenna element and the second antenna element respectively. The controller switches between left-hand circular polarization and right-hand circular polarization radiation patterns by feeding equally divided angle phase difference signals to different first antenna elements and second antenna elements. The second layer, stepped frequency selective surface element, includes first stepped planar grounding units diagonally arranged corresponding to individual first antenna elements and second antenna elements. The fifth layer, stepped frequency selective surface element, includes second stepped planar grounding units diagonally arranged corresponding to individual first antenna elements and second antenna elements.

2. The satellite communication phased array antenna as described in claim 1, wherein, The first layer of stacked antenna radiating elements includes four first antenna elements arranged in a 2×2 array, and the third layer of main antenna radiating elements includes four second antenna elements arranged in a 2×2 array.

3. The satellite communication phased array antenna as described in claim 2, wherein, The controller generates a circularly polarized radiation pattern by individually providing four phase values ​​of a 90-degree phase difference between each of the first antenna elements and the second antenna element in the 2×2 array.

4. The satellite communication phased array antenna as described in claim 3, wherein, The first antenna element and the second antenna element of the 2×2 array are respectively input with clockwise phases of 0 degrees, 90 degrees, 180 degrees and 270 degrees to generate a right-hand circularly polarized radiation pattern; the first antenna element and the second antenna element of the 2×2 array are respectively input with counterclockwise phases of 0 degrees, 90 degrees, 180 degrees and 270 degrees to generate a left-hand circularly polarized radiation pattern.

5. The satellite communication phased array antenna as described in claim 4, wherein, The controller includes a time-bit modulation unit, which enables the first-layer stacked antenna radiating element and the third-layer main antenna radiating element to switch between two modes: the right-hand circularly polarized radiation field and the left-hand circularly polarized radiation field, through time-division multiplexing.

6. The satellite communication phased array antenna as described in claim 1, wherein, The fifth-layer stepped frequency selective surface element, the fourth-layer frequency selective surface element, the third-layer main antenna radiating element, and the second-layer stepped frequency selective surface element are provided with electroplated through holes for the paired communication ports to be electrically connected to the first antenna element and the second antenna element.

7. The satellite communication phased array antenna as described in claim 1, wherein, An insulating substrate is provided between adjacent layers of the first layer of stacked antenna radiating element, the second layer of stepped frequency selective surface element, the third layer of main antenna radiating element, the fourth layer of frequency selective surface element, the fifth layer of stepped frequency selective surface element, and the sixth layer containing signal line grounding element.

8. The satellite communication phased array antenna as described in claim 1, wherein, The first layer of stacked antenna radiating elements includes a first grounding frame that surrounds each of the individual first antenna elements, and the third layer of main antenna radiating elements includes a second grounding frame that surrounds each of the individual second antenna elements.

9. The satellite communication phased array antenna as described in claim 1, wherein, The fourth-layer frequency selective surface element includes a grid-shaped grounding border arranged to match the number of the first antenna element and the second antenna element.

Images