A Dielectric Constant Measurement System for Liquid Based on SIW Resonator

Chen, Shichang; Guo, Mengchu; Xu, Kuiwen; Zhao, Peng; Hu, Yue; Dong, Linxi; Wang, Gaofeng

doi:10.1109/access.2018.2857514

Cited by 17 publications

(11 citation statements)

References 21 publications

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“…The 5 GHz excitation is produced by the signal generator SMW200A from Rohde & Schwarz. Of course, if self-sustained operation is required, the driving signal can be easily generated by a PLL-based frequency synthesizer [21]- [22]. Moreover, to compensate for the uncertainty caused by the differences between the real components and their models as well as fabrication tolerance, a long PCL consisting of two adjacent parallel microstrip lines are aligned in the prototype circuit, as shown in Fig.…”

Section: A Simulationsmentioning

confidence: 99%

“…For example, the down-mixer used for simulation is assumed to have constant conversion gain, while for a real device, its gain varies slightly under different LO power, harmonic impedance or working temperature. According to previous literature [19]- [21], these performance deviations will not impede the execution of the proposed architecture as the detailed voltage-permittivity relationship can be readily extracted using curve fitting technique if a set of MUT samples with known permittivity are used for the system calibration. For demonstration, four different dielectric laminates, Rogers 5880, Rogers 4350B, FR4 and a ceramic with relative permittivity of 2.2, 3.48, 4.4, 9.6 and loss tangent of 0.009, 0.004, 0.02, 0.025 are applied in measurements.…”

Section: B Hardware Implementation and Measurementsmentioning

confidence: 99%

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A Portable Microwave Interferometry Sensor for Permittivity Detection Based on CCMRC

Chen

Zhou

et al. 2020

IEEE Access

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A portable microwave complex permittivity sensor based on the interferometry configuration is proposed. A complementary compact microstrip resonant cell (CCMRC) is applied as the sensitive element, which converts the dielectric information of the material under test (MUT) into the phase variations of its transmission coefficient. A miniaturized interferometry platform based on a downconverting mixer further translates the phase change into DC output voltage variation, which can be readily recorded with a direct readout circuit. In this context, expensive and bulky vector network analyzer is no longer needed, thereby leading to a low hardware cost. With comprehensive theoretical analysis, the material permittivity is simply extracted using a specific extrapolation algorithm. As a proof of concept, several different solid material samples with known permittivity values are used to verify the devised detection system. INDEX TERMS Complementary compact microstrip resonant cell (CCMRC), dielectric spectroscopy, direct-conversion mixer, interferometry, microwave sensor.

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Section: A Simulationsmentioning

confidence: 99%

Section: B Hardware Implementation and Measurementsmentioning

confidence: 99%

A Portable Microwave Interferometry Sensor for Permittivity Detection Based on CCMRC

Chen

Zhou

et al. 2020

IEEE Access

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“…It is well known that in order to extract the electrical characteristics of a material by using the resonator method with a high accuracy, the Q-factor of the employed resonator is expected to be as high as possible. In theory, various types of PCB resonators could be used for the PCB material characteristics extraction, including the microstrip resonator, the coplanar waveguide resonator, the stripline resonator as well as the SIW resonator [17]- [22]. Compared with the other types of PCB resonators, the SIW resonator may be the best choice because it can provide much high quality factors even at W-band or above [7].…”

Section: Extracting Principlementioning

confidence: 99%

“…However, these characteristics provided by PCB manufactures are usually only accurate for narrowband and low frequency applications. To this end, many efforts have been made to measure those characteristics for the accurate design of millimeter-wave or terahertz components, including the transmission/reflection method [15], [16] and the resonator method [17]- [22]. The The associate editor coordinating the review of this manuscript and approving it for publication was Wenjie Feng.…”

Section: Introductionmentioning

confidence: 99%

A Simple and Accurate Method for Extracting Super Wideband Electrical Properties of the Printed Circuit Board

et al. 2019

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In order to accurately design microwave, millimeter-wave components and circuits, a simple and accurate method for extracting extremely wideband characteristics of the printed circuit board (PCB), including relative dielectric constant, dielectric loss tangent, and equivalent copper conductivity, is proposed and validated in this paper. By properly selecting wideband distribution of multiple TM mn0 modes in the designed circular substrate integrated waveguide (CSIW) cavities, extremely broadband properties of PCB can theoretically be extracted with only one pair of CSIW cavities. The proposed method overcomes the limitations of conventional methods that only support narrowband applications, require a large number of cavities, and have relatively large errors. The experiments show that the proposed method is able to extract, accurately and efficiently, 8-110 GHz characteristics of a TLY-5Z substrate-based PCB and the extracted results are verified by designing and measuring the fourth-order Chebyshev filter at X-band. INDEX TERMS Dielectric constant, dielectric loss tangent, equivalent conductivity, circular substrate integrated waveguide (CSIW) cavity, wideband characteristics.

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“…One of the advantages of microwave techniques is their high sensitivity. They are widely used for the measurement of the complex permittivity of liquids [1] and solid dielectrics [2]. Traditionally, microwave techniques have been used for the surface impedance (of ) measurements of conductors.…”

Section: Introductionmentioning

confidence: 99%

Estimation of microwave resonant measurements uncertainty from uncalibrated data

et al. 2020

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<div><p class="Abstract">We present an extended study on the uncertainty in resonant measurements. The uncertainty of the resonant frequency and quality factor was estimated. Two different measurement systems and different fitting approaches were used. The effect of the use of uncalibrated resonant curves on uncertainty was extensively studied. For the uncalibrated data the systematic contribution to the uncertainty was determined.</p></div>

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A Dielectric Constant Measurement System for Liquid Based on SIW Resonator

Cited by 17 publications

References 21 publications

A Portable Microwave Interferometry Sensor for Permittivity Detection Based on CCMRC

A Portable Microwave Interferometry Sensor for Permittivity Detection Based on CCMRC

A Simple and Accurate Method for Extracting Super Wideband Electrical Properties of the Printed Circuit Board

Estimation of microwave resonant measurements uncertainty from uncalibrated data

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