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System and method for free-space method dielectric constant measurement through addition of polarization grid

A free space, measurement system technology, applied in the direction of testing dielectric strength, etc., can solve the problems of test result influence and limited improvement effect, and achieve the effect of reducing back and forth reflection and accurate experimental results

Inactive Publication Date: 2017-09-26
BEIHANG UNIV
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Problems solved by technology

These will have a greater impact on the test results
The current solutions include appropriately increasing the size of the sample and using absorbing materials around the test system, etc., but these methods do not solve the fundamental problem and the improvement effect is limited

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  • System and method for free-space method dielectric constant measurement through addition of polarization grid
  • System and method for free-space method dielectric constant measurement through addition of polarization grid
  • System and method for free-space method dielectric constant measurement through addition of polarization grid

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Embodiment Construction

[0021] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0022] The invention provides a free space method dielectric constant measurement system adding a polarization grid, such as figure 2 As shown, the measurement system includes a pair of focusing lens antennas (transmitting antenna 1 and receiving antenna 2), control computer 3, polarized grid 4, stepper motor 5, rectangular pattern converter A6, rectangular pattern transform Device B7 and vector network analyzer 8. The transmitting antenna 1, the polarization grid 4, the sample to be tested 9 and the receiving antenna 2 are arranged coaxially from left to right in sequence. The transmitting antenna 1 is connected to the port A of the vector network analyzer 8 through the rectangular mode converter A6, and the receiving antenna 2 is connected to the port B of the vector network analyzer 8 through the rectangular mode converter B7. The vector network analyzer 8 and ...

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Abstract

The present invention discloses a system and method for free-space method dielectric constant measurement through addition of a polarization grid, belonging to the electromagnetic field and microwave technology field. On the basis of the current free-space method measurement system, a polarization grid mesh is added next to one side of a sample to be measured, a changing curve of reflection parameters and transmission parameters of the network with the angle of the polarization grid mesh is measured to distinguish the electromagnetic wave penetrating into the electromagnetic wave of the grid mesh from the invariable electromagnetic waves of other paths; and the changing signals carry the dielectric information of the sample to be measured, and the coefficients such as the amplitude in the changing curve are employed to perform evolution of the dielectric constant of the sample to be measured. In a stable environment, the changing of the network parameters with the polarization grid angle is not sensitive to the electromagnetic environment, and therefore the influences of the electromagnetic wave diffraction and diffraction in the experiment environment is effectively reduced. Besides, focusing lens antennas employ lossy material polylactic acid (PLA) to effectively reduce the multiple reflection of electromagnetic wave between the antennas to allow an experiment result to be more accurate.

Description

technical field [0001] The invention relates to a free space method dielectric constant measurement system added with a polarization grid, which belongs to the technical field of electromagnetic field and microwave. Background technique [0002] The dielectric constant is an important electromagnetic parameter of matter, and it is of great significance to realize the accurate measurement of the dielectric constant of objects. The current dielectric constant measurement technology is mainly divided into two types according to the different test principles: the network parameter method and the resonant cavity method. Among them, the network parameter method can be divided into terminal loading method, free space method and transmission / reflection method. The free space method is an open-field electromagnetic characteristic parameter testing technology, which belongs to the transmission / reflection method. The measurement system of the free space method such as figure 1 As sh...

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Application Information

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IPC IPC(8): G01R31/12
CPCG01R31/12
Inventor 白明宇文丽刘大伟张博明
Owner BEIHANG UNIV
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