- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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A Compact X-Band Vector Network Analyzer for Microwave Image Sensing
摘要： This work develops a compact and portable X-band vector network analyzer (VNA) for low-cost microwave image sensing applications. Since significant local oscillator (LO) injection pulling and poor LO phase noise performance may reduce the accuracy of measurement, the developed VNA uses the single-conversion technique and the phase noise cancellation technique to suppress the injection pulling effect and the LO phase noise, respectively. A hybrid phase detection algorithm that includes arctangent, arcsine and arccosine functions is proposed to overcome the bottleneck of the distortion of conventional quadrature phase detection in some phase regions. Experimental results demonstrate that the X-band microwave image sensing system that uses the developed VNA, which is highly compact and portable, can effectively yield a contour image of bones in a chicken wing and pork ribs.
关键词： transceiver,microwave image sensing,vector network analyzer,phase noise,frequency synthesizer
更新于2025-09-23 15:22:29
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[IEEE 2019 Sixteenth International Conference on Wireless and Optical Communication Networks (WOCN) - Bhopal, India (2019.12.19-2019.12.21)] 2019 Sixteenth International Conference on Wireless and Optical Communication Networks (WOCN) - Analysis and Design of Stub loaded Closed Loop Microstrip Line Filter for Wi-Fi Applications
摘要： The design of a compact Band Stop Filter (BSF) operating at 2.4 GHz is discussed in this paper. Initially, a BSF is designed using insertion loss method and is validated by simulation software ANSYS Designer. The designed filter is then modified as a planar stub loaded closed loop resonator energized using microstrip line. The simulation of this filter is optimized using ANSYS HFSS. A prototype is fabricated on FR-4 epoxy having dielectric permittivity 4.4 and loss tangent 0.02. The theoretical results and simulation results are experimentally validated using Vector Network Analyzer (VNA). Empirical equations for the filter designs is also presented. The equations is able to predict the resonant frequency with less than 4 % error. All the three, theoretical results, simulation results and measured results are in good agreement.
关键词： closed loop resonator,Stub loading,Band Pass Filter (BSF),Filter,Vector Network Analyzer
更新于2025-09-23 15:21:01
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Removing Random Phase Contributions of Sweeping Local Oscillator From Modulated RF Measurements
摘要： This paper proposes a measurement strategy to remove the random phase contributions of the sweeping local oscillator (LO) from modulated radio frequency phase measurements based on downconversion. To obtain a stable phase spectrum for each run of tone-by-tone sweeping measurement, the LO used for downconversion is coupled out to an extra path and modulated to be a wideband multisine signal. By monitoring the phase change of multisine signal at a specific and fixed frequency point, random LO phase offsets during the frequency sweep can be measured and compensated. In this paper, two experimental test benches with the same core measurement strategy but different architectures are established for method validation. According to the experimental results using test bench one, the phase stability is ±(0.2°–0.4°) at 1.8 GHz for fundamental mixing-based downconversion and ±(0.6°–1°) for harmonic mixing at 6 GHz. Based on test bench two, relative phase deviations of ±(0.8°–1.2°) at 22 GHz for fundamental mixing and ±(2°–3°) at 66 GHz for harmonic mixing are reachable.
关键词： modulated measurement,Local oscillator (LO),phase measurement,mixer,vector network analyzer (VNA)
更新于2025-09-23 15:21:01
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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - InGaN Quantum Dots for Intermediate Band Solar Cells
摘要： A novel simple approach to the verification process for millimeter-wave vector network analyzer waveguide calibration is reported using a single reconfigurable component verification kit. Conventional techniques require multiple verification components and these only exist commercially for operation up to 110 GHz. At millimeter-wave frequencies, the use of multiple components can lead to significant errors due to imperfections in waveguide flange misalignments during the multiple component connections. The reconfigurable component is designed so that its electrical properties can be changed quickly to a broad range of predetermined values without introducing additional errors due to changes in flange alignment. Once connected, the component can be reconfigured to introduce relative changes in the reflected and transmitted signals. For millimeter-wave metrology, where mechanical precision is of paramount importance, this single-component verification approach represents an attractive solution. A proof-of-concept verification process is described, based on full-wave electromagnetic modeling, hardware implementation, and validation measurements using standard WR-15 waveguide (50–75 GHz).
关键词： verification,millimeter-wave,Measurement,vector network analyzer (VNA),reconfigurable,rectangular waveguide
更新于2025-09-23 15:19:57
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Wideband optical vector network analyzer based on polarization modulation
摘要： We propose a polarization modulator (PolM) -based optical vector network analyzer (OVNA) with extended measurement bandwidth. The combined use of the PolM, a polarization controller (PC) and a polarizer performs phase-and-intensity hybrid modulation of optical signal with double-sideband (DSB) modulation. The ratio between phase and intensity modulations is controlled by the PC, leading to different modulation formats. The frequency response of a device-under-test (DUT) can be obtained by processing the results of two measurements under two arbitrarily different modulation formats. The significance of this work lies in that the measurement of a DUT with bandpass response can be simply achieved, which is a huge challenge for the conventional single-sideband (SSB)-based OVNAs. In addition, the measurement bandwidth is doubled compared with the conventional SSB-based OVNA. Moreover, the PolM-based OVNA can avoid the bias drifting problem using conventional Mach–Zehnder modulator (MZM)-based scheme. The proposed method is theoretically and experimentally demonstrated. A proof-of-concept experiment is carried out and a DUT with bandpass response is successfully measured using the proposed scheme.
关键词： Optical vector network analyzer,Double-sideband modulation,Polarization modulation
更新于2025-09-19 17:15:36
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OVERSIZED CIRCULAR CORRUGATED WAVEGUIDES OPERATED AT 42 GHZ FOR ECRH APPLICATION
摘要： The design, analysis, and manufacturing of an oversized circular metallic corrugated waveguide with rectangular and square grooves for transmitting power from gyrotron to tokamak or dummy load have been carried out. To carry high power at millimeter wave with lower transmission loss, a corrugated waveguide is preferred. A corrugated waveguide with HE11 mode gives lower attenuation than a smooth circular waveguide with TE11 mode. The theory behind the depth and width selection of corrugations required to carry the linearly polarized (HE11) mode is explained in this paper. The proposed structures are designed and simulated in CST microwave studio software. Rectangular and square groove circular corrugated waveguides each having a length of 500 mm were fabricated and tested using ZVA50 vector network analyzer. Based on performance results, it is derived that the square groove corrugated waveguide gives lower insertion loss of 0.08 dB/meter than rectangular groove corrugated waveguide which gives insertion loss of 0.11 dB/meter.
关键词： ZVA50 vector network analyzer,ECRH application,insertion loss,oversized circular corrugated waveguides,CST microwave studio,HE11 mode
更新于2025-09-16 10:30:52
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A facile method toward potentially next-generation bacteria detectors using polymer/MWCNT/Au nanocomposite films: A possibility to detecting ability through the shift in resonance frequency
摘要： The global market demands for new disposable wireless sensors for food, clinical, tissue, and drug industries in the near future. Gelatin-based multi-layer films were successfully prepared using a room temperature solution casting method. Anticipating future developments, we have looked at the potential applications of cost-effective passive RFID tags in the detection of bacteria (here trypsin was used for biosensing tests) in body fluids, foods, medicines, and much more. This paper is concerned with the measurement of the dielectric constant of materials remotely by using the frequency shift of RFID tags, in the first step. In continue, we establish a setup along with a novel multi-layer structure of gelatin films determining whether there exists any bacterium in a biological fluid or not, by using a physical approach. For this, penetration of bacterium through gelatin multi-layer films causes the RFID tags to be exposed to the biological fluid changing the dielectric constant, detected as a frequency shift. Samples were characterized utilizing FTIR, XRD, TGA, FESEM, tensile, and VNA analyzes. Our proposed wireless biomimetic sensor is able to detect trypsin within a few minutes. The immediate application of our designed biosensor is for the elderly and infants diapers, but further applications in biomedicine, biomedical engineering, food industry, and things like that can be anticipated.
关键词： Gelatin,Vector Network Analyzer,Au Nanoparticles,Trypsin,Carbon nanotubes
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Calibration of Multi-Tone Stimulus Harmonic Phase Reference Based on DRTO and Prime Number Algorithm
摘要： This paper proposed a prime number algorithm to avoid embedded errors when using Digital Real-Time Oscilloscope to calibrate a multi-tone stimulus harmonic phase reference. Measurement results are presented to verify the validity of the frequency selection algorithms.
关键词： Digital Real-Time Oscilloscope,prime number algorithm,uncertainty,multi-tone,Nonlinear Vector Network Analyzer,Harmonic Phase-Reference
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Mixed Uncertainty Propagation Method in S-Parameter Measurements
摘要： A new approach to uncertainty evaluation in scattering parameters measurements which is based on the well-established method of ripple and a subsequent uncertainty propagation through calibration algorithms is proposed. The procedure gives a practical alternative to guarantee traceability to Type-N and 3.5 mm connectors in OSM, SOLT and SOLR calibrations. Its implementation is described and tested.
关键词： calibration,traceability,vector network analyzer,measurement uncertainty,scattering parameters
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - On-Wafer CPW Standards for S-Parameter Measurements of Balanced Circuits Up to 40 GHz
摘要： The Multimode Thru-Reflect-Line (TRL) calibration technique is applied to perform mixed-mode scattering parameter measurements of on-wafer differential circuits. The paper describes the design and the realization of coupled coplanar waveguide (CCPW) standards on quartz (SiO2) substrate in the Ground-Signal-Ground-Signal-Ground (GSGSG) configuration. Simulation and measurement results for a mismatched transmission line demonstrate the validity of the method up to 40 GHz.
关键词： Coplanar waveguide,Multimode TRL calibration,vector network analyzer,mixed-mode Scattering parameters,differential circuits,microwave measurements
更新于2025-09-10 09:29:36