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hi i want to generate a pulsed electron beam of 100mA avg current, Beam energy = 30MeV. How is it possible to make it in cst microwave studio.?
hi - might someone be able to clearly explain, preferably from the cst user manual, the calculation method for both radiation efficiency and total efficiency? thanks in advance.
The difference is in how you set up and define the port. S11 is a measurement of how much energy is reflected back. So in one sim, you have a good impedance match at the port, and in the other you don't. Check your port definitions to make sure the impedances are the same, say 50ohm or whatever. I think cst has a checkbox for matching port imp
I am simulating in terahertz (THz) range which source resistance is high (>10 Kohms), I want to obtain S-parameters and input impedance but i saw that in some frequencies the amount of S-parameters are larger than 0 dB and real part of input impedance is also negative. i think they are not reasonable, can anyone explain what is wrong in my simul
Good Day Member, I am working on a rectenna that harvest GSM energy at 900 MHz and converts it into DC Voltage for charging a cell phone battery. From various literature review, I have made a simple patch antenna in cst MWS and designed its relevant rectifier circuit in ADS. The questions I want to ask are following: 1. In most of the rectenn
What is the significance or what information does we get from energy and balance curves in cst Microwave studio ?
Hello, I have a question concerning the calculation of the energy density. I have a simulation with both an energy monitor and a field monitor. As far as I know the energy density is defined as follows: We = 0.5 * epsilon * |E |^2 However if I calculate the energy density at one point from the value of the field (...)
how will i know the amount of energy received on a particular surface in my case i have electron source emitting electron and i want to know how much energy/radiation is received on sapphire window facing the source
Hi, I want to elvaluate of the secondary electrons emission(SEE) from a metalic target that is bombarded by energetic ions. It is well known tt there are two procedures for SEE from the target i.e. 1) Potential emission (related to potential energy of the incoming ion) and 2) Kinetic emission (related to kinetic energy of the incoming ion). My qu
Hello, i am new here in the forum. I have one question on cst Microwave Studio. . So i have a restrangular waveguide with e=5 μ=1. I use a waveguide port to put energy. I want to estimate the charasterist impedance Zo. I think that this must be 50 Ohm for most of RF circuts. So i have |s11|=0,62 and magnitude Zmatrix(1,1)=300. So we have s11=Z
I'm having an issue with the online AR-Filter in cst - it can produce accurate S11 and speed up simulation greatly, but the radiation efficiency seems to be very low. Every simulation ends up with very low gain/realized gain when I use the AR-Filter. When I simulate without it, there are ripples in the S11 and the "energy state criterion" might s
Antenna efficiency in cst shows values like: 0.7869 and 1.2693. Do they mean 78.69% and 126.93% respectively? If so, can the antenna efficiency be more than 100%, without violating energy conservation?
Hello all I try to construct a plasma champer excited by microwave energy. Before construction i want to simulate it with cst, first without the plasma and then ,if possibole, with the plasma load. The champer includes (1) A box cavity. (2) An ellipsoidal cavity. (3) An antenna located in the box cavity. (4) A rectangular waveguide to
Hi Bara'a, What is the version of cst do you use ? In other words, you can set some options in the Transient Solver Menu... BR - - - Updated - - - Hi Bara'a, What is the version of cst do you use ? In other words, you can set some options in the Transient Solver Menu... BR
my structure in cst is too big.(3m*1.6m*1.6* my dimension background material, frequency range is 0.05 to 0.15 GHz , and mesh operation is 15 per wave length per ) because I must to simulate this structure. but it gives me this warning "maximum simulation time reached. solver stopped. please note that steady state energy criterion has not been sa
Yes your assumption is correct. -20 dB is insufficent if you result differ between -30 and -20. Yes, I am refereing to the "balance" in 1D result. You can refer to help in cst for a defination of power balance.
Thank you. Just curious but do you work with cst at your job?
Hi, I have a problem. I am simulating a structure w/ a waveguide port. S11 parameter is linearly higher than 1 when I use open (add) space Boundary condition. Physically not meaningful due to energy conservation. But, when I use open Boundary Conditions, this time I obtain an error as: " Inhomogeneous material at open boundary detected.
Hi everyone, I have a problem. I am simulating a structure w/ a waveguide port. S11 parameter is linearly higher than 1 when I use open (add) space Boundary condition. Physically not meaningful, energy conservation. But, when I use open BC, this time I obtain error as: " Inhomogeneous material at open boundary detected. (The structure must
hi guys, I am using cst to simulate metamaterial sturctures. One problem confuses me a lot : I oftern got results of s11 and s12, which do not satisfy law of energy conservation, since s11^2+ s12^2 >1, even in the case of lossy metal structure. I thought something is wrong with my simulation . To my surprise, many cst official modals (...)
Hello, I'm trying to simulate a fractal antenna by cst MWS V5, and after simulation it gives me: "Maximum number of pulse widths simulated, solver stopped. Please note that the steady state energy criterion has not been reached". Could someone give me some hints? I've uploaded bot my projects and the PDF Thanks Andrea
hi guys,,, I am trying to visualize the inductance of an antenna using cst MWS 2009. I suppose that the inductance is the ability of the structure to store magnetic field. So I used Magnetic energy Density field monitor, but am not sure if it adequately represents the inductance! Is there any way to obtain a rough idea about the inductan
Hi in cst I want to simulate 2 antennas , the first one is to transmit and the other one to receive . When I run the simulation in cst it excites both antennas separately but I need to do this only for the first one and want to see the energy received by the other one.
hello In cst MWS when we simulate any antenna then in 1D result there are two result Balence and energy. i want to modify these result so tell me how can i modify these result??? what is the parameteer which affect these results and how can i do this???? These two result is most importent factor for calculating right Far field of antenna. help
Has anyone done anything with the PIC solver in cst Particle Studio, particularly involving field emission? If so maybe someone can enlighten me as to a few things that I don't quite understand? In the example problem "field emitter tip", under "2D/3D Results", the "particle preview" shows electrons manifesting 1 kev or more energy as they ar
Dear all As we know there should be an acceptable matching load on non-excited ports in S parameters calculation for having accurate results. And it seems that this is achieved by setting resistor magnitude for discrete ports in cst and so there should be different amount of energy absorption by ports for different amounts of resistors in discre
yeah that cud be the reason...I am using open boundary conditions. This pifa design is for GSM 900/1800 MHz. Although i am getting the resonant frequencies at 900 and 1800 MHz but with little bandwidth. I am using cst , so in boundary conditions it gives options either with open add space or open. Do you any idea wt could be the Mesh c
hello anyone can tell me how i can see the near field disribution of an antenna in cst and also how can i calculate SAR . plz tell me step by step preocedure
hi during simulation of some structures in cst . i get the this warning message: maximum number of pulse widths simulated,solver stopped. please note that the steady state energy criteria has not been satisfied. can we trust the results if one get this warning message and if not what can we do to avoid this warning than
Hi, I have simulated and build lots of spiral antennas for my thesis. I used cst but always simulated with a lumped port. The results were pretty good and almost equal to the measurements. ciao
Hallo, in fullwave simulation, waveguide ports are used to excite the structure with energy. I am talking about driven problems only. A 2D Eigenmode solver determines the excitation field in preprocessing, and considers it as time varying boundary condition in the solution process. The characteristic impendance and gamma are also known from th
Hi, All, In the help document of cst, it is stated that: "The total energy is represented by the completely stored energy amount in the simulated structure, equally to the electric or magnetic energy: W = We = Wm. For the eigenmode solver the energy is equal 1 Joule, (...)
Most of the time, if I see that kind of warning during the simulation, first I check the units. If units are OK, then check if your design has any features that cst graphic tool doesn't understand. This happens most of the time, if you importing your model from autocad or any other drawing tool. And before any simulation, try to heal all the shapes
I kwon hat for HFSS this is a tipical mash problem. If mash isn't fine enought rad efficiency goes over 100%. Maybe cst has the same problem.
Hello, Make sure you don't mesh to dense, cst sometimes gets into trouble if you have smaal mesh cells. If you have a coarse mesh, consider mesh refinement. The energy balance curve should never go upwards only downwards or horizontal for a few time steps. Bye.
Hi, How I can correctly define the port for the structures like in the photo? I just defined the port as +-4*feeder width. cst gives that "some higher modes are not considered. This leads to an inaccurate energy balance. Consider to reduce the port size or decrease the upper frequency limit." The port size seems to be ok. Also the upper freq
The energy balance correctly works only for closed structures. The radiation effects not takes into account. Only waveguide ports are considered. And quantum effects in photonic crystal not simulated by cst-MWS. If You simulate the photonic crystal based on classical EM-theory (quantum effects are not considered), the energy conservation law (...)