A device and method for calibrating phase changes of moving cables in vector field measurement using a circulator
A technology of moving cables and phase changes, applied in the field of terahertz measurement, can solve the problems of inability to accurately obtain the phase and low reflected signal strength, and achieve the effect of simple implementation and improved signal-to-noise ratio.
Active Publication Date: 2019-01-18
ZIJINSHAN ASTRONOMICAL OBSERVATORY CHINESE ACAD OF SCI
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However, when the length of the cable is relatively long, due to the loss of the cable itself, the intensity of the reflected signal is too small to accurately obtain its phase, and instead introduces a larger phase error
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[0037] The present invention is described in further detail now in conjunction with accompanying drawing.
[0038] Such as figure 2 As shown, the device for using the circulator to calibrate the phase change of the moving cable in the vector field measurement includes a radio frequency synthesizer 1 and a local oscillator frequency synthesizer 2, the radio frequency synthesizer 1 is connected with the first directional coupler 3, and the first directional coupler 3 is A double directional coupler, the straight-through end is connected to the mobile cable 4, and the two coupling ends are respectively connected to the reference mixer one 5 and the reference mixer two 6.
[0039] The mobile cable 4 is connected to port one of the circulator 7, and the port two of the circulator 7 is connected to the amplifier 8, and the output terminal of the amplifier 8 is connected to the second directional coupler 9, and its coupling coefficient is equivalent to the amplification factor of th...
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The invention discloses a device for calibrating a phase change of a moving cable in vector field measurement through a circulator. The device comprises a radio-frequency frequency synthesizer and a local oscillation frequency synthesizer; the radio-frequency frequency synthesizer is connected with a first directional coupler, the direct connection end of the first directional coupler is connected with the moving cable, and the coupling end of the first directional coupler is connected with a reference frequency mixer; the moving cable is connected to a first port of the circulator, a second port of the circulator is connected to a second directional coupler through an amplifier, the direct connection end of the second directional coupler is connected with a radio-frequency frequency multiplier, the coupling end of the second directional coupler is connected with a third port, and the radio-frequency frequency multiplier is connected to a receiver; the medium-frequency output end of the reference frequency mixer is connected to a collection card; the local oscillation frequency synthesizer is connected to a local oscillation frequency multiplier and the reference frequency mixer separately through a power divider, and the local oscillation frequency multiplier is connected to the receiver; the receiver is connected to the collection card through a medium-frequency processing module. According to the device, the signal-to-noise ratio of reflected signals is increased, and the problem that when the moving cable is too long, the reflected signals are too low to be detected is solved.
Description
technical field [0001] The invention belongs to the technical field of terahertz measurement, and in particular relates to a device and method for using a circulator to calibrate the phase change of a moving cable in terahertz frequency bands (including millimeter wave and submillimeter wave bands) during vector field measurement. Background technique [0002] Vector field measurement refers to the simultaneous measurement of the magnitude and phase distribution of an electromagnetic field. This measurement technology can deduce the three-dimensional electromagnetic field distribution and propagation characteristics of the radiation source to be measured in the whole space range by scanning the two-dimensional vector field shape measurement of a plane, cylinder or sphere, so it is widely used in large reflector antennas, feeder Performance measurements of source speakers, millimeter wave imaging systems, and quasi-optical systems. [0003] A typical terahertz plane vector f...
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IPC IPC(8): G01R25/00
CPCG01R25/00
Inventor 胡洁娄铮史生才
Owner ZIJINSHAN ASTRONOMICAL OBSERVATORY CHINESE ACAD OF SCI