Equivalent far-field testing device and method for large-scale cylindrical phased-array antenna

Abstract

The invention provides an equivalent far-field testing device and method for a large-scale cylindrical phased-array antenna. The equivalent far-field testing device comprises a microwave anechoic chamber, a turntable, a signal transmitting module, a signal transmitting module and a control unit, wherein the microwave anechoic chamber is used for providing an electromagnetic wave free propagation space which is not reflected by an internal electromagnetic signal and is not interfered by an external electromagnetic signal; the turntable is used for adjusting the attitude of the measured cylindrical phased-array antenna so as to measure the radiation characteristics of the measured cylindrical phased-array antenna in different directions; the signal transmitting module is used for generatingan excitation signal for antenna testing; and the control unit is used for controlling the excitation signal of the signal transmitting module and the rotation angle of the turntable, and acquiring and processing the radiation characteristics of the measured cylindrical phased array antenna in different directions. The equivalent far-field testing device and the method are suitable for testing thelarge cylindrical phased-array antenna, the construction cost of a test system can be effectively saved, the adaptability is high, and the test result is more accurate.

Description

technical field [0001] The present invention relates to the technical field of antennas, in particular to an equivalent far-field testing device and method for a large cylindrical phased array antenna. Background technique [0002] Phased array antennas have many advantages such as antenna beam shape agility, spatial power combining, and multi-beam forming, and have been more and more widely used in various electronic information devices. From the perspective of array form, phased array antennas are generally divided into linear arrays or planar arrays, while cylindrical phased array antennas are composed of array elements distributed on multiple same circumferences on the same axis. The inner circumference of cylindrical phased arrays Rotational symmetry can generally maintain the balance of mutual coupling between array elements, which is beneficial to the realization and application of engineering research. Unlike linear array and planar array phased array antennas, when...

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Problems solved by technology

The near-field scanning test system uses a probe antenna with known properties to scan on a known surface of the phased array antenna to be tested. This method has the advantage of a compact site, but the system construction is complicated and the cycle is long. Disadvantages such as the need for far and near field transformation, large amount of data, and long measurement cycle

The compact field test system simulates an infinitely long field by means of flat wave fronts generated by mirrors, lenses, and horns. This method has the advantages of high test accuracy, but its system construction is complicated, the construction period is long, and the cost is high.

[0004]The traditional far-field test method requires the test distance to meet the far-field conditions. For large-scale cylindrical phased array antennas, it is necessary to build a microwave anechoic chamber with a relatively large size during the test. For example, an antenna with a caliber of 2 meters needs a test distance of about 267 meters at a test frequency of 10 GHz, and it is difficult for general microwave anechoic chambers to meet the test distance requirements

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