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32 Threads found on edaboard.com: Find Resonance Frequency
You'll find calculators for coil spring resonance frequency on the internet, e.g. finding the wire material's shear modulus is the major problem.
Your tank circuit must operate at some nominal frequency either with no object in it and with a object in it. So find the first frequency is easy, so set your sweep frequency ,say 20% lower. Then put in the largest object with the most lossy material into the coil and see what frequency the circuit resonates (...)
Hi, I am simulating to find the resonance frequency and measured quality factor of some CPW transmission line resonator with a short circuit as termination. They are coupled to the feedline via a series coupling capacitor. I set the length from the coupling cap to the short-to-GND, then I applied a sheet and set the boundary as lumped (...)
If you reverse engineer the drum HV bias generators used in large laser printers you will find they use a step up transformer in a resonant oscillator mode. Thus no EMI is generated with the sine wave output. No bridge multipliers are needed, just rectify with a string of 500V rated 1/4W resistors for DC voltage feedback. PWM control is used to ge
hello, i have a project about designing circler SRR split ring with resonance frequency of 10GHz, however i could find any physical characteristics of the curcler ring. if someone can guide me to some papres i will be tankful. noris.
(3) Case style 0603,how we have to read exactly SRF and frequency. 1. Choose your C value where you want to find the SRF. 2. find that value on the x axis 3. From that point on the x axis, draw a vertical line. 4. find the intersection of your vertical line with the blue curve (blue for 0603 size, as show in the
Hi, I simulated a patch antenna with coaxial feed to resonate at 2.8 GHz with a return loss of -20 dB and no resonance elsewhere. Please find attached my model. I fabricated this antenna and tested it. The fabricated antenna has return loss of only -3.6 dB at 2.8 GHz whereas it is resonating at 5.8 GHz with a return loss of -20 dB. Please
On page 6 of AN57 by powerint.com, it states that the resonant frequency of the Power stage LC should be greater than 500Hz... Why is this?...I could not find out from the forum.
How can we find the frequency resonance of the inductance and its quality factor by HFSS?
Hi, I need to find some way to generate 10V to 15V sine wave voltage from 3V battery with minimum current consumption (<100uA), the load is negligible - 1Meg @ 5pf. One very attractive solution is to use the resonance of quartz or ceramic crystals and to get high voltage straight from the crystal. The problem is that I can't find any (...)
I want to use psp analysis to match the input resistance of power amplifier to 50 ohm, i measure Zin real and imaginary and then match them using smith chart software, but then when i measure s11 using psp, i find strange results (either shift in the resonance frequency or no matching at all) if i use s parameter analysis the results are (...)
Hello I have a sinusoidal signal generator connected in series with a toroidal choke and the choke is connected to the oscilloscope to the ground. As I vary the frequency of the generator I notice dips and peaks of the sinusoidal waveform on the scope. I find the maximum peak which is at a specific frequency. Then I reduce the number of (...)
Hi you can use from energy curve to find resonant frequencies in a cavity. So,you have to follow these steps: 1. recored E field components in one point at cavity,in time domain. 2. use from energy formula,to get energy in time domain. 3. use FFT to convert energy from time domain to frequency domain. 4. plot energy in frequency domain (...)
Derive its transfer function and then find the poles and zeros. They will give you an idea about resonance or frequency response of the circuit.
Hello, I am doing a simple simulation of a box (A x B x D) and using eigenmode to find resonance. However HFSS is giving me the lowest frequency for TE101, but is seeming to ignore the TM110 mode (which should be at a much lower frequency). Any suggestions on how I can have HFSS properly detect the TM110 mode? Note: A (...)
Hi, maybe I find a bug in Hfss. A patch on the outside surface of a cylinder, at first, the resonance frequency is 2.45G, then rotate the patch about the z-axis 12 degree, and get a different resonance frequency :2.20G. And I find when the angle is 45,90, 135 and so on, the (...)
Hi all, i am doing a project about EM simulation for dielectric fractal Menger Sponge Stage 2. I am using CST MWS as simulator. The objective is to send the incident plane wave torward the structure and find out the resonance frequency for which the EM fields are localised in the structure. I tried plane wave and wave ports method. But it is (...)
hi i need a simple analytics expression of height frequency passive circuit. to find capacitance and inductance for example base on metallics lines and relative permittivity of substrat
I guess you need to find the resonance first. There must be problems with your simulation.
It doesn't make sense to use FDTD to find a "boundary condition." The boundary condition is what you need to do at the edge of your grid to prevent reflections. It is part how you implement FDTD, not what FDTD is calculating. In general, to find a resonant frequency in FDTD, you excite the problem with a pulse sourse (short Gaussian) (...)
Hello, Here are the formulae for W & L of Microstrip fed patch antenna design... W=(C *sqrt )/2*f0 where W is the Width of of the radiating edge C=3*10e8 f0 is resonance frequency & L=C/(2*f0*sqrt(er)) & find out the effective L you can see these eqations & more details in the following DESIGN OF MICROSTRIP PATCH ARRAY ANTENNA do
You could try the eigenmode solver. It is good at finding resonances. later :)
I have met a problem recently and hope experts can give me some hints. You can find the resonance frequencies from the S parameter curves of a transmission line (eg. microstrip line as shown in the following figures). When both sides of the transmission line are attached with a PMC(perfect magnetic wall) wall, how will the resonance (...)
I don?t think exist a formula to find the exact influence of metal thickness on the patch antenna resonant frequency, but definitely it will affect the antenna resonance, due to changing the fringe field currents. EM simulation will give the best answer.
Some times it increases the gain. Check this antenna with and with out the partial GND plane and confirm. you will find the resonance frequency shifting for these cases but check for gain only.
Hi, I am looking for the way or principle to find L and C values which give maximum frequency band width. For instance, L and C make resonance at one frequency dependent upon the value of L and C. But It's going to have different BW. If I want to design CPW considering isolation with maximum frequency (...)
XL=2Π(capital pi)fL Where f is frequency in hertz and L is inductance in Henres. So plugging in we get 25.1 Ω reactance. So find the capacitor value that will give you 25.1 ohms at 2000 hertz. 3.2 ?F is what you need. Google in resonance calculator and you will get calculators that will help you with these problems.
Hi Guys, I have a doubt on quater wave impedance tranformer. As i going thru a IEEE paper on inthis matter, i found out the the electrical length is defined in Θ, degree. assume given 90° for Θ=λ/4 length. How do we find the operting frequnecy of the circuit? thanks for your support
For CST eigen mode solver, you cannot find the modes of open structures. Also, if you place it very far from the microstrip line, you will start to have some higher order WAVEGUIDE modes, that is the shield acting as a waveguide cavity. So, I think you should have some feeling where would the resonance frequency be and adjust the shield size (...)
i am design a LNA with ADS. While simulating, i find that the output 1dB compression point drops from 12dBm to about 8.5dBm after i substituting the ideal lumped inductor with the real spiral inductor provided by the design kits. it frustrates me. my lna topology is below. anyone knows how to cancel the nonlinearity caused by the nonlinearity of
Hello I am using HFSS 10.0 to find out the resonant frequency of certain transmission line resonator in a multilayer substrate. kind of a stripline structure, i.e., the substrate's top-most and bottom-most surface are covered with good thin conductor as ground; the remaining 4 surfaces are just exposed to surrounding air. I believe that the 'ei
Hey everyone, I have a question about the vector field display in HFSS. Lets say I setup my antenna design in HFSS for a solution frequency of 10 GHz and after the solition , I find that the resonance is at 8 GHz instead of 10 GHz. So if I want to see the vector fields at the resonance frequency of 8 GHz, (...)


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