Method and system for conformal array low sidelobe pattern synthesis based on aperture field inversion
A technology for pattern synthesis and conformal arrays, which is applied to antenna arrays, devices for manufacturing antenna arrays, antennas, etc., to avoid cumbersome solving processes and improve overall efficiency
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Embodiment 1
[0045] Such as figure 1 As shown, it is an overall flowchart of the pattern synthesis method of the present invention. This embodiment provides a technical solution: a conformal array low sidelobe pattern synthesis method based on aperture field inversion, including the following steps:
[0046] S1: Aperture field inversion
[0047] Obtain the plane near-field data of the conformal array antenna, perform uniform normal weighted superposition on the data to obtain the plane approach data of the conformal array antenna, define the aperture field plane according to the scanning direction of the conformal array antenna, and reverse the plane near-field data of the conformal array antenna Performed on the aperture field plane, the aperture field inversion transforms conformal array optimization into planar array optimization, avoiding the cumbersome solution process of cross-polarization and non-coplanar phase centers, and is worthy of promotion and use;
[0048] S2: unit amplitud...
Embodiment 2
[0073] In this implementation, a conformal array antenna is optimized by using the low-sidelobe pattern synthesis method of conformal arrays on arbitrary surfaces based on aperture field inversion. The conformal surface is intercepted from an aircraft wing, and the antenna works in the 2.5GHz to 3GHz frequency band , the array size is 18 (azimuth)*8 (pitch), and the antenna polarization direction is horizontal polarization. It is required that the azimuth plane sidelobe level is lower than -30dB when not scanning.
[0074] Such as figure 2 as shown, figure 2 It is an implementation flow chart of the conformal array low sidelobe pattern synthesis method in this embodiment. First, the antenna is erected in the microwave anechoic chamber, and the planar near-field data of each unit is collected separately by means of the planar near-field acquisition system and multi-channel switch. Then, the normal pattern is synthesized, and the near-field data is uniformly weighted and su...
Embodiment 3
[0080] The conformal surface selected in this embodiment is taken from an aircraft fuselage. The antenna works in the 3.2GHz-3.5GHz frequency band. The array size is 6 (azimuth)*16 (pitch), and the polarization direction of the antenna is horizontal polarization. It is required that the sidelobe level of the elevation plane is lower than -30dB when the elevation scan is 45 degrees.
[0081] Such as Figure 6 As shown, it is the horizontal polarization pattern on the elevation plane when the array antenna is scanned at 45 degrees in elevation without weighting at 3.5GHz. Firstly, in the microwave anechoic chamber, the plane near-field data acquisition when each unit is individually excited is completed by means of a multi-channel switch, and then the plane near-field data is synthesized by pitch scanning at 45 degrees, and the far-field pattern is obtained by near-far field transformation.
[0082] Then select the aperture field plane perpendicular to the scanning direction of...
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