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143 Threads found on edaboard.com: Permeability

How to check the possibilty of hysteresis in solid materials?

If I have a dispersive material with a complex permeability and permittivity and I want to know the possibility of hysteresis occurrence inside this material, how can I check for that or how to plot the hysteresis loop?

Plots In HFSS (Permeability, permitivity, waveimpedance etc)

hello, can anyone please help me out that how could i have the following plots using HFSS. 1. Wave Impedance (z) Vs Frequency 2. Refractive Index (n) Vs Frequency 3. Permitivity (eps) Vs Frequency and 4. permeability Vs Frequency please inform me with complete procedure and commands i have to use in HFSS to have these plots for a Split rin

evaluation of S-parameter using HFSS

thanks dear i'm aware about that procedure but i couldn't get my required plots as for refractive index versus frequency, permitivity and permeability so for them do you have any suggestions?

Inductance measurement- Which is better?

In different words, Practically, Inductance can vary with frequency (due to parasitic capacitance), temperature of core (permeability varies) and current (affects the losses). So Inductance measurement should be done at conditions in which it is going to be used. if application of an inductor is 10KHz, 100mA but inductance measurement is done at

Transformer's core size

B is proportional to the magnetising current, not the load current, the two add vectorially... For ferromagnetic materials we should't consider it magnetic permeability as linear. At least within small ranges.

New material defining

Yes it is correct and also to define new material you should ave the knowledge of tat material properties like permittivity, permeability, conductivity and loss tangent, and is the new material is frequency dependent or independent also important, then try for defining new material is better.

RF 0.18 um CMOS Inductor Relative Permeability

I've been calculating the inductance of a 0.18u CMOS process inductor in Cadence using several formulas such as Wheeler's, Rosa's and monomial expressions for octagonal spiral inductors. All these formulas give the same amount with very little variation while the real inductance is significantly different. As these calculations depend solely on par

Nicolson Ross Weir (NRW) method, CST data calculations using matlab

Dear all, i have CST data for S-parameters (s11 and s21) and i want to calculate for complex permittivity and permeability on matlab using NRW. I tried several times but is not giving me the exact result. I went through several materials but my code doesn't work still. kindly help me out

Inductance of toroid and other characteristics

Hi, using this calculator it seems that the desired inductance can be accomplished usind different cores with differend permeability materials, bu altering the number of turns. However, on RF, Q is also considered and some companies like Amidon provide different materials for differend frequenc

Primary inductance change with frequency

I have measured the primary inductance of a low frequency transformer at different frequencies, with 10Khz it is 2.2mH and at 100Khz it is 460uH. It has a resonant of about 800khz With the following equations L=n^2*AL L=(3.2*n^2*u*A)/(10^8*l) I guess I am right in saying the AL has a direct relationship with the permeability of the core

Fill factor Caculation

I'm modelling a metamaetrial slab on CST and get S-parameters from the results. Then I need to extract permeability and permittivity from the those parameters. I learnt a method based on the Lorentz Model, as mu(w)=1+(F*w^2)/(w0^2-w^2)+jrw Note there is a F called fill factor, but I don't know how to calculate in my model. Since

Electromagnetic Flux Density Required to move an object

Do you know the relative permeability, rotational inertia, friction and threshold for criteria "to Separate", and the channel properties?

Relay electromagnet magnetization. Types of relays for maximum magnetic dynamic range

Hello, I would like to vary the magnetic permeability of a cored coil using an electromagnet, taken out from a relay. I want to be able to apply from very small magnetization to the coil, up to quite large, so I need high magnetization dynamic range (if such term exist). For that purpose: 1. What types of relays should I best choose? 2. What vol

how to plot s(2,1) in HFSS for microstrip patch antenna

thats right ... but without s21 how permittivity and permeability plots can be obtained for metamaterial antenna...... so that negative refractive index can be verified

Refractive index of graphite

I might be wrong but I though that refractive index was an optical parameter. Electrical parameters include :- resistivity, relative permeativity, relative permeability, velocity factor. Frank

Ferrite beads, Impedence at 100MHz.

Microwave ferrite has much lower permeability and more conductive oxide filler. <30MHz ferrite has the highest mu with cobalt doped iron oxide with much less conductive metal particles as beads around conducting wires. But high permeability and lower resistance SMD in a ferrrite power may use silver oxide with iron oxide and is more expensive. Bu

Metamaterials: imaginary part of permittivity being negative

Hello dear friends, I'm working on a new metamaterial structure that have nonlinear properties with in a broad bandwidth. I have simulated the structure in cst and got the S11 and S21 of the structure. with the relations given in the articles calculated permittivity and permeability of the structure. but there is an amazing point in the result and

Coupled magnetics for interleaved boost converter with Kool Mu Core

It's not completely clear how you arrived at the leakage parameters in post #1. Quite obviously the coupling factor depends besides winding distribution also on the powder core permeability. The Al value is valid for an unformly distributed winding. Besides main and leakage inductance, you'll also care for total ampere turns and possible core sa

Magnetic permeability coil tuning, pros and cons?

I suppose you changed the Henry value of an inductor temporarily? This concept could be useful. A fixed inductor becomes variable. I may resemble the concept of the magnetic amplifier. By sending DC current through an auxiliary winding, you can alter how much current goes through the main winding. However if the ind

CST: Define a Time Dependent Dielectric Constant of a material

From what I have seen CST does not have the ability to change permittivity/permeability with respect to time. You are going to have to make a custom code for that. If would recommend Finite-difference time-domain (FDTD). There is a great section about it here: Go to the academics section.

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