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Near-field antenna test system based on frequency division and test system thereof

A test system and near-field antenna technology, which is applied to antenna radiation patterns, measuring devices, electromagnetic field characteristics, etc., can solve the problems of long test time for large-scale phased array antennas, improve test speed and test efficiency, and save switching time Effect

Pending Publication Date: 2017-06-13
SHANGHAI HOLLYWELL ELECTRONICS SYST TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But even so, the test time for large phased array antennas is still quite long, often requiring one month or even several months of test time

Method used

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  • Near-field antenna test system based on frequency division and test system thereof
  • Near-field antenna test system based on frequency division and test system thereof
  • Near-field antenna test system based on frequency division and test system thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] see figure 1 , when the antenna to be tested is a receiving antenna, Embodiment 1 of the frequency division-based near-field antenna testing system of the present application includes:

[0037] ——The signal source is connected to the frequency conversion unit through a cable. The signal source is used to generate the initial signal f0 and send it to the frequency conversion unit. The initial signal f0 is, for example, generated by a crystal oscillator (crystal oscillator) and optionally obtained through frequency conversion. The initial signal f0 is used as a test frequency of the entire near-field antenna test system.

[0038] The signal source also sends its own clock signal as a reference signal REF to each component of the entire near-field antenna test system, so as to provide a unified time reference for the entire near-field antenna test system. The reference signal REF is, for example, 10 MHz.

[0039] ——Frequency conversion unit, connect each probe through c...

Embodiment 2

[0072] Embodiment 2 can also adopt the same frequency traversal scanning as Embodiment 1, probes covering the entire near-field scanning surface, conversion of near-field test parameters and far-field test parameters, and other additional solutions.

[0073] see Image 6 , which is the third embodiment of the frequency division-based near-field antenna testing system of the present application when the antenna to be tested is a receiving antenna. Compared with the first embodiment, the third embodiment replaces the single signal source and the frequency conversion unit in the first embodiment with multiple signal sources.

[0074] The multiple signal sources are connected to each probe through a cable. The multiple signal sources are used to generate a set of coherent transmission signals ft1-ftN. Coherence means that the signals generated by each signal source have a definite phase relationship. The frequencies of this group of transmitted signals ft1~ftN are different, bu...

Embodiment 3

[0080] Embodiment 3 may also adopt the same additional schemes as in Embodiment 1, such as frequency traversal scanning, probe covering the entire near-field scanning surface, conversion of near-field test parameters and far-field test parameters, and the like.

[0081] Compared with the existing single-probe phased array near-field antenna test system, the near-field antenna test system of the present application uses multiple probes, which can significantly improve the antenna test speed and test efficiency, and shorten the test time. Compared with the existing multi-probe phased array near-field antenna test system, this application replaces the switch switching mode with frequency division (frequency division), because the switch switching time is omitted, and multiple probes can be transmitted together by the waiting The test antenna is simultaneously received and detected and analyzed by the single channel of the receiver, which further improves the test speed and test ef...

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Abstract

The invention discloses a near-field antenna test system based on frequency division. An antenna to be tested is an array antenna, a phased array antenna or a reflector antenna. When the antenna to be tested serves as a receiving antenna, the near-field antenna test system comprises a signal source, a frequency conversion unit, a plurality of probes, the antenna to be tested, and a receiver. The signal source generates an initial signal. The initial signal is converted by the frequency conversion unit into a set of transmission signals which are sent to the plurality of probes to be simultaneously transmitted out. The frequencies of the set of transmission signals are different and are similar to the frequency of the initial signal. The electromagnetic waves radiated from the plurality of probes are simultaneously received and sent to the receiver by the antenna to be tested after subjected to space transmission. The received signals are detected by the receiver so that the amplitudes and the phases of different frequency components in the received signal are obtained. The method not only improves antenna test speed and test efficiency, but also has accurate test results.

Description

technical field [0001] The present application relates to an antenna testing system and a testing method thereof, in particular to a near-field testing system and a near-field testing method of an array antenna, a phased array antenna or a reflector antenna. Background technique [0002] An antenna array is a collection of individual antennas. These individual antennas are used to transmit and / or receive radio waves, they are connected together, and the signals (eg currents) controlling them have a specific amplitude and / or phase relationship. The control signals of different phases interact so that the signals of the antenna array are strengthened in predetermined directions and suppressed in non-predetermined directions. This makes the antenna array usually used and treated as a single antenna, and has better directional characteristics and antenna gain than individual antennas. [0003] There are many types of antenna arrays. If each individual antenna in the antenna a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R29/10G01R29/08
CPCG01R29/0871G01R29/10
Inventor 周建华毛小莲王玉峰
Owner SHANGHAI HOLLYWELL ELECTRONICS SYST TECH
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