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Active microwave sensor based on microstrip complementary open-loop resonator structure

A microwave sensor and complementary open-loop technology, applied in the microwave field, can solve the problems of limited measurement range and low sensitivity, and achieve the effects of improving quality factor, high sensitivity and high practicability

Active Publication Date: 2021-05-07
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing sensors that use feedback loops to improve the quality factor have a disadvantage that their sensitivity is very low (no more than 0.5×10 -2 ), which completely limits their measurement range

Method used

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  • Active microwave sensor based on microstrip complementary open-loop resonator structure
  • Active microwave sensor based on microstrip complementary open-loop resonator structure
  • Active microwave sensor based on microstrip complementary open-loop resonator structure

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Embodiment Construction

[0032] The present invention will be described in further detail below with specific embodiments in conjunction with the accompanying drawings.

[0033] Such as figure 1 Shown is the structure schematic diagram of the present invention, and the sensor of the present invention comprises microstrip complementary open-loop resonator structure, active feedback loop, dielectric layer PCB board 4, metal sheet 10, and wherein microstrip complementary open-loop resonator structure consists of a The feeder 6 and the etched metal sheet 10 are composed of a grooved metal CSRR structure 11. The active feedback loop is composed of a microstrip line loop 5, an MRF947 microwave transistor 2, and a pair of 2.2nH inductors; one end of the feeder 6 is coupled with an active feedback loop. Loop, the other end is used to connect the SMA connector 7; the active feedback loop is coupled to the underlying CSRR slot ring 11; the collector and collector of the microwave transistor 2 in the active feed...

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Abstract

The invention discloses an active microwave sensor based on a microstrip complementary open-loop resonator structure. The active microwave sensor is used for measuring the complex dielectric constant of a dielectric material. The sensor comprises a micro-strip complementary open-loop resonator structure, an active feedback loop, a dielectric layer and a metal sheet, and the active feedback loop is a micro-strip line loop with a microwave amplifier MRF947 and can generate negative resistance to compensate loss of a resonator; and the micro-strip complementary open-loop resonator structure is composed of a pair of feeder lines and a grooved metal CSRR structure, the grooved metal CSRR structure is a square groove ring, the part between grooves is an area with the maximum electric field intensity, a to-be-measured medium sample covers the whole CSRR structure, and an S parameter curve of the sensor is measured through a vector network analyzer. The sensor has the advantages of high sensitivity, high quality factor and ultra-small electrical size, and ensures the accuracy of measurement.

Description

technical field [0001] The invention belongs to the field of microwave technology, and relates to an active loop excitation sensor, in particular to a microwave sensor for the complex dielectric constant of a dielectric material based on a microstrip complementary split-ring resonator (MCSRR) structure. sensor. Background technique [0002] Dielectric material complex permittivity (ε r =ε' r (1-jtanδ e ), ε′ r Indicates the dielectric constant, tanδ e Accurate measurement of loss values) plays an important role in healthcare, food safety, and industrial manufacturing. In recent years, planar microwave resonant sensors have been extensively studied due to their advantages of low cost and easy fabrication. In a microwave resonant sensor, the resonant frequency and quality factor are related to the relative permittivity and electrical loss, respectively, that is, when a material sample under test (MUT) is placed on the sensor, the resonant frequency will shift downward du...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/26
CPCG01R27/2694
Inventor 赵文生甘宏祎王大伟陈世昌刘琦王高峰
Owner HANGZHOU DIANZI UNIV
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