scholarly journals Analysis of Time and Frequency Response for Single/Multi-Tone Stimulus Harmonic Phase-Reference Based on Prime Number Algorithm

Electronics ◽  
2020 ◽  
Vol 9 (11) ◽  
pp. 1836
Author(s):  
He Yu ◽  
Cong Wang ◽  
David A. Humphreys ◽  
Maoliu Lin ◽  
Luqman Ali ◽  
...  
Keyword(s):  
Prime Number ◽  
Sampling Rate ◽  
Stimulus Frequency ◽  
Tone Stimulus ◽  
Harmonic Phase ◽  
Measurement Results ◽  
Vector Network Analyzers ◽  
Network Analyzers ◽  
Improved Performance ◽  
Nonlinear Vector

We present a spectrally-dense phase-reference and its calibration for nonlinear vector network analyzers (NVNAs) using a step recovery diode (SRD) comb-generator with a multi-tone stimulus. Frequency selection for multi-tone stimulus based on prime number algorithms was used with the Digital Real-Time Oscilloscope (DRTO) to avoid the sub-Nyquist spurs components and to increase the effective sampling rate so that the waveform can be observed in greater detail. The measured results were calibrated to minimize drift and jitter and achieved excellent agreement between the prime number and the exact frequency strategies except at the sub-Nyquist frequencies. The analysis indicates that the prime number selected frequencies show significantly improved performance by avoiding the DRTO distortion components. We have verified the validity of the method described in this paper by experimental measurement results.

Measurement the Transmission Characteristics of the Power Line Communication Channel Based on Periodic PN Sequence

2013 ◽  
Vol 340 ◽  
pp. 567-571
Author(s):  
Pei Ling Zhang ◽  
Hong Xin Zhang
Keyword(s):  
Measurement Method ◽  
Power Line ◽  
Transmission Characteristics ◽  
Power Line Communications ◽  
Response Characteristics ◽  
Measurement Results ◽  
Vector Network Analyzers ◽  
Network Analyzers ◽  
Periodic Autocorrelation ◽  
Pn Sequences

A novel method for measurement of power line communications channel transmission characteristics on the basis of PN sequences excellent periodic autocorrelation properties is presented and discussed in this article. In order to improve the measurement precision, a compensation method in frequency domain is proposed in this paper also. This measurement method can easily and quickly obtain channel characteristics inculding reliable amplitude and phase frequency response characteristics. The measurenent experiment results basically consistent with the vector network analyzers measurement results, which has demonstrated the efficiency of the measurement method.

A nonlinear verification device for nonlinear vector network analyzers

2016 ◽  
Author(s):  
David A. Humphreys ◽  
Mohammad Rajabi ◽  
Dominique Schreurs ◽  
Troels Nielsen
Keyword(s):  
Vector Network Analyzers ◽  
Network Analyzers ◽  
Nonlinear Vector

Calibration of Multi-Tone Stimulus Harmonic Phase Reference Based on DRTO and Prime Number Algorithm

2018 ◽  
Author(s):  
He Yu ◽  
Mao-Liu Lin ◽  
David A Humphreys ◽  
Fan-Yi Meng
Keyword(s):  
Prime Number ◽  
Tone Stimulus ◽  
Harmonic Phase

scholarly journals Design and Evaluation of Nonlinear Verification Device for Nonlinear Vector Network Analyzers

2018 ◽  
Vol 66 (2) ◽  
pp. 1121-1130 ◽  
Author(s):  
Mohammad Rajabi ◽  
David A. Humphreys ◽  
Gustavo Avolio ◽  
Pawel Barmuta ◽  
Konstanty R. Lukasik ◽  
...  
Keyword(s):  
Vector Network Analyzers ◽  
Network Analyzers ◽  
Nonlinear Vector

Improved Waveguide Calibration of Vector Network Analyzers in WR15

1989 ◽  
Author(s):  
P. Gianfortune ◽  
M. Radmanesh
Keyword(s):  
Vector Network Analyzers ◽  
Network Analyzers

scholarly journals Reference Breast Phantoms for Low-Cost Microwave Imaging

2020 ◽  
Vol 14 (4) ◽  
pp. 411-415
Author(s):  
Emine Avşar Aydin ◽  
Selin Yabaci Karaoğlan
Keyword(s):  
Breast Cancer ◽  
Low Cost ◽  
Microwave Frequency ◽  
Biological Tissues ◽  
Microwave Imaging ◽  
Vector Network Analyzers ◽  
Network Analyzers ◽  
Computer Based ◽  
Breast Phantoms ◽  
Inverse Radon Transform

Microwave imaging provides an alternative method for breast cancer screening and the diagnosis of cerebrovascular accidents. Before a surgical operation, the performance of microwave imaging systems should be evaluated on anatomically detailed anthropomorphic phantoms. This paper puts forward the advances in the development of breast phantoms based on 3D printing structures filled with liquid solutions that mimic biological tissues in terms of complex permittivity in a wide microwave frequency band. In this paper; four different experimental scenarios were created, and measurements were performed, and although there are many vector network analyzers on the market, the miniVNA used in this study has been shown to have potential in many biomedical applications such as portable computer-based breast cancer detection studies. We especially investigated the reproducibility of a particular mixture and the ability of some mixes to mimic various breast tissues. Afterwards, the images similar to the experimentally created scenarios were obtained by implementing the inverse radon transform to the obtained data.

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