High-sensitivity microwave microfluid sensor based on electromagnetic band gap structure
A technology with electromagnetic band gap structure and high sensitivity, applied in the microwave field, can solve the problems of low sensitivity, few microfluidic sensors, and low Q value, and achieve the effect of improving sensitivity, low Q value and high Q value.
Active Publication Date: 2020-04-28
HANGZHOU DIANZI UNIV
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Problems solved by technology
At present, in the design and application of microfluidic sensors, the sensitivity of microfluidic sensors based on the existing resonance principle is low, and as the dielectric constant of the liquid increases, the Q value continues to decrease, and the microfluidic sensor based on the electromagnetic bandgap structure design few fluid sensors
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[0024] The structure of the present invention will be further described in detail below in conjunction with specific embodiments of the accompanying drawings.
[0025] Such as figure 1 Shown is a schematic diagram of the structure of the present invention, and the structure from the top layer to the bottom layer is CPW transmission line 2, dielectric layer 3 and electromagnetic bandgap structure 4 respectively. The electromagnetic bandgap structure is composed of two periodic structures, and the size of the unit structure is 28mm×28mm, and each unit structure is connected by a rectangular microstrip line.
[0026] The CPW microstrip line structure is placed on the upper surface of the dielectric layer, including an input port and an output port respectively located on both sides of the dielectric layer, and the two ports are used to connect to the SMA connector, and the SMA connector and the vector network analysis The instrument is connected; the width of the CPW microstrip ...
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Abstract
The invention discloses a high-sensitivity microwave microfluid sensor based on an electromagnetic band gap structure. The sensor sequentially comprises a coplanar waveguide transmission line, a dielectric layer and an electromagnetic band gap structure from top to bottom, the electromagnetic band gap structure is a periodic structure, and all unit structures are connected through microstrip lines. A microfluid channel is arranged on a lower side of the electromagnetic band gap structure and covers gaps in a left side and a right side of the electromagnetic band gap unit structure respectivelyin a branch path mode, all branch paths are gathered at an upper port and a lower port respectively, and a liquid sample is injected through a needle hole at one port and then flows out of the otherport. In the invention, the electromagnetic band gap structure is used as a basis; and a microfluidic channel is designed into a plurality of shunt branches so that a path around an electric field isobviously increased, conditions of low sensitivity and a low quality factor Q value of an existing microfluid sensor are improved, the sensitivity is improved, meanwhile, the microfluid sensor has a high Q value, and a high resolution and accuracy of measurement are ensured.
Description
technical field [0001] The invention belongs to the field of microwave technology, and in particular relates to a high-sensitivity microwave microfluidic sensor structure based on an electromagnetic bandgap structure, which is used to characterize the dielectric constant of liquids. Background technique [0002] With the continuous development of microwave technology, microwave sensors are increasingly used in electronic, biomedical, and industrial applications. At the same time, due to their high sensitivity, good robustness, and low manufacturing and measurement costs, they are ideal for microfluidics and microfluidics. First choice for biosensing applications. [0003] The dielectric constant is one of the important physical properties that reflect the electromagnetic properties of the substance. It is an important link between the interaction between the substance and the electromagnetic field, and the response of a material to electromagnetic waves depends on its dielec...
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IPC IPC(8): G01N22/00G01R27/26
CPCG01N22/00G01R27/2617
Inventor 赵文生张园园王大伟王晶王高峰
Owner HANGZHOU DIANZI UNIV