Network analyzer (electrical)

Summary

A network analyzer is an instrument that measures the network parameters of electrical networks. Today, network analyzers commonly measure s–parameters because reflection and transmission of electrical networks are easy to measure at high frequencies, but there are other network parameter sets such as y-parameters, z-parameters, and h-parameters. Network analyzers are often used to characterize two-port networks such as amplifiers and filters, but they can be used on networks with an arbitrary number of ports. Overview Network analyzers are used mostly at high frequencies; operating frequencies can range from 1 Hz to 1.5 THz. Special types of network analyzers can also cover lower frequency ranges down to 1 Hz. These network analyzers can be used, for example, for the stability analysis of open loops or for the measurement of audio and ultrasonic components. The two basic types of network analyzers are

scalar network analyzer (SNA)—measures amplitude

Official source

https://en.wikipedia.org/wiki/Network_analyzer_(electrical)

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Sub-terahertz spectroscopy of magnetic resonance in BiFeO3 using a vector network analyzer

Jean-Philippe Ansermet, Christian Caspers, Emile Jacques de Rijk, Varun Paresh Gandhi, Arnaud Magrez

Detection of sub-THz spin cycloid resonances (SCRs) of stoichiometric BiFeO3 (BFO) was demonstrated using a vector network analyzer. Continuous wave absorption spectroscopy is possible, thanks to heterodyning and electronic sweep control using frequency extenders for frequencies from 480 to 760 GHz. High frequency resolution reveals SCR absorption peaks with a frequency precision in the ppm regime. Three distinct SCR features of BFO were observed and identified as Psi(1) and Phi(2) modes, which are out-of-plane and in-plane modes of the spin cycloid, respectively. A spin reorientation transition at 200 K is evident in the frequency vs temperature study. The global minimum in linewidth for both Psi modes at 140 K is ascribed to the critical slowing down of spin fluctuations. (C) 2016 Author(s).

Amer Inst Physics2016

In this paper, we present an efficient measurement technique for the analysis of power line communication (PLC) signals. The frequency spectrum associated with PLC signals extends from 1 MHz to 30 MHz. The proposed technique can be applied to a network containing multiconductor overhead lines and/or underground cables and it complements the theoretical formalism based on scattering parameters presented previously in the work of F. Issa et al. (2002). The use of a vector network analyzer is recommended for the evaluation of the scattering parameters matrix. Based on the proposed approach, we present examples of simulations for the voltage level of the PLC signals for different simple configurations. The simulations are compared with experimental data and a satisfactory agreement is found

2003

This paper describes the simulation, design, realization, and experimental test of a tapered transmission line (TL) for adapting a broad-band impulse generator to a radiating antenna, for a frequency range of 50 MHz-1 GHz. Two different taper geometries are considered and discussed in the analysis: exponential and logarithmic. Two analysis methods are also used: 1) analytical equations obtained by applying the TL theory and 2) full-wave numerical simulations in both frequency and time domains using Comsol. It is shown that, in general, an exponential taper performs better than a logarithmic one, particularly at high frequencies. Time-domain simulations reveal that, for fast transient subnanosecond pulses, both tapers can be used equivalently and the signal does not suffer from any significant distortion while traveling along the tapers. We also show that analytical equations obtained using the TL theory are in very good agreement with full-wave simulation results and can be used advantageously in the design of tapers. This paper also presents the mechanical design and the realization of an exponential taper used for the connection of a 50-Omega pulser to a half-impulse radiating antenna (HIRA) having an input impedance of 100-Omega. The realized taper is fully characterized in the frequency domain using a vector analyzer and in the time domain using a reflectometer and shown to be performing in agreement with the simulations.

2011