Showing 1-25 of 5,195 resultsfor "Index Terms":Calibration Constant
"Index Terms":Calibration Constant
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A Novel Calibration Algorithm With Unknown Line-Series-Shunt Standards for Broadband S-Parameter Measurements
This paper presents a novel calibration algorithm using unknown line-series-shunt standards that are suitable for planar transmission line structures for the broadband S-parameter measurements of microwave vector network analyzers. The derivations are based on the eight-term error model with the matched line standard and the lumped assumptions for the series and shunt calibration kits, respectivel...Show More
Multi-frequency approach to the coaxial multiline through-reflect-line calibration
18-th INTERNATIONAL CONFERENCE ON MICROWAVES, RADAR AND WIRELESS COMMUNICATIONS
Year: 2010 | Conference Paper |
We present an improved coaxial multiline through-reflect-line calibration method which allows to correct for errors in the description of calibration standards. Our approach is based on the multi-frequency formulation of the vector-network-analyzer calibration problem which accounts for the physical relationships between calibration standard S-parameters at different frequencies. We illustrate our...Show More
An Effective Approach to Deembed the Complex Propagation Constant of Half-Mode SIW and Its Application
In this paper, a numerical short-open calibration (SOC) method is presented to numerically deembed the complex propagation constant of half-mode substrate integrated waveguide (HMSIW). After three distinctive equivalent circuit networks are described for SOC deembedding procedures, the propagation characteristics of HMSIW can be extracted. The numerical stability and convergence are illustrated. T...Show More
The propagation constant of coaxial offset shorts with rough surfaces
29th Conference on Precision Electromagnetic Measurements (CPEM 2014)
Year: 2014 | Conference Paper |
Cited by: Papers (3)
Offset short calibration schemes for vector network analyzers require the exact knowledge of the propagation constant of the offsetting lines. The propagation constant is difficult to compute from first principles and thus a method to indirectly determine the propagation constant is presented. At 50 GHz, the method achieves improvements of accuracy of at least 0.013 in linear S-parameters for a 2....Show More
Inter-comparison of SMOS and aquarius Sea Surface Salinity: Effects of the dielectric constant and vicarious calibration
Emmanuel P. Dinnat;Jacqueline Boutin;Xiaobin Yin;David M. Le Vine
2014 13th Specialist Meeting on Microwave Radiometry and Remote Sensing of the Environment (MicroRad)
Year: 2014 | Conference Paper |
Cited by: Papers (14)
Two spaceborne instruments share the scientific objective of mapping the global Sea Surface Salinity (SSS). ESA's Soil Moisture and Ocean Salinity (SMOS) and NASA's Aquarius use L-band (1.4 GHz) radiometry to retrieve SSS. We find that SSS retrieved by SMOS is generally lower than SSS retrieved by Aquarius, except for very cold waters where SMOS SSS is higher overall. The spatial distribution of t...Show More
A novel broadband non-resonant Thru-Line (TL) technique is proposed for the extraction of substrate complex permittivity, while the influence of the end-launch connectors is fully suppressed. The main difference to the traditional TRL techniques is that only two calibration standards are needed and the length difference between Thru and Line is much larger than a quarter of a wavelength at the cen...Show More
Over-determined offset short calibration of a VNA
2008 71st ARFTG Microwave Measurement Conference
Year: 2008 | Conference Paper |
Cited by: Papers (12)
Electromagnetic modeling of coaxial 1:85mm and 1:0mm standards for Vector Network Analyzer (VNA) calibration shows only limited accuracy. The approach presented in this paper can overcome this accuracy limitation. Instead of handing over the standards’ S-parameters to the calibration algorithm, parameterized models of the standards are used as input into the calibration algorithm. The technique is...Show More
Comparisons of algorithms for broadband continuous extraction of complex propagation constant involved in various microwave measurements
2016 IEEE International Instrumentation and Measurement Technology Conference Proceedings
Year: 2016 | Conference Paper |
Propagation constant characterization plays a key role in various microwave measurement situations such as thru-reflect-line (TRL) calibration, interconnect characterization, fixture de-embedding and measurement of material properties. To differentiate the forward and backward propagating factors, sign-ambiguity problem of square-root searching is inevitable in the process of characterizing the ei...Show More
Extraction of Complex Permittivity of Dielectrics on Package from W-band to D-band
Yi-Ting Lin;Hung-Chun Kuo;Po-I Wu;Ming-Fong Jhong;Po-Chih Pan;Chung-Yuan Liu;Chen-Chao Wang;Tzong-Lin Wu
2021 IEEE 71st Electronic Components and Technology Conference (ECTC)
Year: 2021 | Conference Paper |
Cited by: Papers (3)
In this paper, a simple method of extracting dielectric material is proposed and copper surface roughness is taken into consideration. The measured results from W-band to D-band are shown to verify the proposed method of extracting complex permittivity of dielectrics. Besides, to validate the proposed transmission line technique, the full sets of complex S-parameters with an appropriate “through-r...Show More
Recent Results on the Accurate Measurements of the Dielectric Constant of Seawater at 1.413GHz
IGARSS 2008 - 2008 IEEE International Geoscience and Remote Sensing Symposium
Year: 2008 | Conference Paper |
Measurements of the complex dielectric constant of seawater at 30.00 psu, 35.00 psu and 38.27 psu over the temperature range from 5degC to 35degC at 1.413 GHz are given and compared with the Klein-Swift results. A resonant cavity technique is used. The calibration constant used in the cavity perturbation formulas is determined experimentally using methanol and ethanediol (ethylene gycol) as refere...Show More
Calibration of the spring constants of various AFM cantilevers with the small uncertainty level of 2%
2006 SICE-ICASE International Joint Conference
Year: 2006 | Conference Paper |
Calibration of the spring constants of atomic force microscopy (AFM) cantilevers is one of the issues in biomechanics and nanomechanics for quantified force metrology at pico- or nano Newton level. In this paper, we present an AFM cantilever calibration system: the Nano Force Calibrator (NFC), which consists of a precision balance and a one-dimensional stage. Three types of AFM cantilevers (contac...Show More
The Influence of Calibration Materials' Dielectric Properties on Deembedding Accuracy for Liquid Characterization
2024 15th Global Symposium on Millimeter-Waves & Terahertz (GSMM)
Year: 2024 | Conference Paper |
The calibration and de-embedding outcomes of utilizing different liquid combinations as standards are studied. Using standards with significant disparities aids in minimizing calibration errors, whereas employing standards with similar liquid dielectric constants creates significant calibration discrepancies. Optimal calibration liquids consist of a high permittivity liquid, a low permittivity liq...Show More
Enhancing Accuracy in Actigraphic Measurements: A Lightweight Calibration Method for Triaxial Accelerometers
This paper presents a simple, lightweight, automatic calibration method for low-cost triaxial accelerometers, utilizing the Earth’s gravitational constant in various orientations. It can be easily implemented using only fixed-point arithmetic and can run on low-power microcontrollers for real-time measurements, making it practical for scenarios with limited data storage and computational power, su...Show More
Origin of the Half-Wavelength Errors in Microwave Measurements Using Through–Line Calibrations
The through–line calibration family uses measurements of a through connection and an inserted line to determine the propagation constant of the line. This is typically used with measurements of a reflect standard to characterize fixturing errors. Subsequently, the S-parameters of a device under test are de-embedded. Measurement uncertainties occur at frequencies where the length of the line standa...Show More
Demonstration of TRL Calibration Performance on mmW PCBs using WSMP Connectors
2023 100th ARFTG Microwave Measurement Conference (ARFTG)
Year: 2023 | Conference Paper |
Cited by: Papers (1)
We present, for the first time, the utility of Thru-Reflect-Line (TRL) calibration up to 100GHz on millimeter-wave printed circuit boards using next-generation WSMP connectors. A coplanar waveguide (CPW) TRL calibration kit is fabricated on Isola Astra MT77 substrate and raw measurements for 2-port scattering parameters of the calibration standards are recorded in two overlapping bands using two s...Show More
Formulation for Propagation Factor Extractions in Thru-Reflect-Line/Line-Reflect-Line Calibrations and Related Applications
This study reformulated the eigenvalue problems associated with the thru-reflect-line (TRL)/line-reflect-line (LRL) calibration and other related applications without presuming that the line standards or test lines are reciprocal or symmetrical and that they have identical transitions explicitly defined by fixed physical reference planes. The new formulation, therefore, can identify the components...Show More
Numerical multimode calibration technique for extraction of complex propagation constants of substrate integrated waveguide
2004 IEEE MTT-S International Microwave Symposium Digest (IEEE Cat. No.04CH37535)
Year: 2004 | Conference Paper |
Cited by: Papers (22)
Integrated planar technique has always been considered as a reliable candidate for low-cost mass production of millimeter-wave circuits and systems. In this paper, a numerical multimode calibration procedure is proposed and developed with a commercial software package on the basis of a full-ware finite element method (FEM) for the accurate extraction of complex propagation constants of substrate i...Show More
This paper presents an alternative method for a network analyzer calibration, in particular an in-fixture calibration. It avoids de-embedding of the device under test and it allows the characterization of an unknown two-port inserted between an arbitrary number of cascaded unknown two-ports. An unknown obstacle must be moved on a transmission line into three positions. The LNN calibration techniqu...Show More
Numerical calibration on complex propagation constants of grounded coplanar waveguides
2017 IEEE Electrical Design of Advanced Packaging and Systems Symposium (EDAPS)
Year: 2017 | Conference Paper |
Cited by: Papers (1)
In this paper, the complex propagation constant of grounded coplanar waveguide (GCPW) is extracted by the multiline method, as well as the thru-line method, over a wide frequency range. The effects of port discontinuities and feeding network are de-embedded successfully. Base on the results, the propagation characteristics of the finite grounds conductor backed CPW (FGCBCPW) and GCPW are compared....Show More
Development of a temperature dependent dielectric constant measurement system
2015 IEEE 6th International Symposium on Microwave, Antenna, Propagation, and EMC Technologies (MAPE)
Year: 2015 | Conference Paper |
In this paper, a dielectric constant measurement system is presented, which can work at different temperatures from room temperature to 200°C. This system is developed based on the theory of NRW algorithm using coaxial line. The calibration standards are also designed for TRL calibration. Temperature distribution is analyzed and optimized carefully using ANSYS thermal analysis to make sure tempera...Show More
Determination of vertical antenna pattern of high-resolution airborne SAR and radiometric calibration
Qing Wang;Qiming Zeng;Jian Jiao;Xiao Zhou;Cunren Liang;Sheng Gao
2012 IEEE International Geoscience and Remote Sensing Symposium
Year: 2012 | Conference Paper |
Cited by: Papers (1)
An external calibration experiment was held for an airborne SAR. The paper describes the calibration experiment that uses a series of trihedral corner reflectors to calibrate the high-resolution SAR images, including antenna pattern correction and absolute radiometric calibration. In this paper, we specifically address the determination of vertical antenna pattern with multi-flight SAR imaging geo...Show More
Broadband Measurement of Dielectric Properties of Substrates up to 67 GHz using a Coaxial Air Line
2020 IEEE/MTT-S International Microwave Symposium (IMS)
Year: 2020 | Conference Paper |
Cited by: Papers (2)
This paper presents a useful low-cost wideband dielectric characterization technique for packaging substrates using a coaxial air line technique up to 67 GHz. To the authors' knowledge, this is the first demonstration of dielectric properties up to 67 GHz using coaxial air lines. The proposed method to extract the material properties is reference-plane-invariant (RPI) which combines Nicolson-Ross-...Show More
A method of measuring SAR calibration constant using ocean
2011 3rd International Asia-Pacific Conference on Synthetic Aperture Radar (APSAR)
Year: 2011 | Conference Paper |
SAR calibration is one of the most important technique of measurable observation and to calibrate SAR images to normalized radar cross sections (NRCS) a calibration constant is required. Usually the calibration constant is determined by analyzing measurements of corner reflectors or transponders. However, for Global Monitoring mode of ASAR, we can not facture so large radar cross section (RCS) cal...Show More
An investigation of calibration approaches to RS105 test system of MIL-STD-461
Lijun Yao;Feng Zhang;Dong Liu;Hongliang Sun;Tao Shen;Ning Kang;Jianling Huang
Proceedings of 2014 3rd Asia-Pacific Conference on Antennas and Propagation
Year: 2014 | Conference Paper |
Cited by: Papers (1)
MIL-STD-461 has been applied and adapted as the basis for electromagnetic interference standards in many countries. By investigating the different versions of MIL-STD-461/462 in this paper, it can be found that the requirement and procedure of system calibration of RS105 test are more and more specific and comprehensive. Some problems are also discussed subsequently in the application of the calib...Show More
Propagation characteristics of corrugated substrate integrated waveguide with no metallic vias
2016 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)
Year: 2016 | Conference Paper |
Cited by: Papers (1)
In this paper, a corrugated substrate integrated waveguide (CSIW) with no metallic vias is proposed, and its propagation characteristics are investigated via our numerical SOC de-embedding method. In our analysis, dominant operating modes in this CSIW at different frequencies are extensively discussed. In final, its complex propagation constant, i.e., phase and attenuation constants, is derived to...Show More
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