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73 Threads found on Field Region
The n region already has alot of electrons so i dont see the reason......If a photon frees an e- from p region, cant they just go out from that side? Is it because of the electric field from the depletion layer? But the depletion layer isnt throughout the whole length right, so what drives them? also, If a photon frees an e- n (...)
An application field where you often find liquid cooling is motor inverters for electric cars. I see it also in multiple 100 kW power inverters, but it's not necessarily.
finally i conclude that when multiplication is happened that electric field is high,and in this region is true this point.
RCS is an electromagnetic signature of a scatterer, and is the acronym for radar cross section.. Provided an EM wave hits a scatterer (an obstacle), it induces currents on the scatterer which then is a source of scattered fields.. This scattered field in far field region as a function of azimuth and elevation angles theta (...)
Concentric guardrings are common in ESD related circuitry (pad cells etc.). One useful function is that the built-in depletion region is a "getter" for loose minority carriers in the substrate. The ring can also kill lateral BJTs' base ohmically and deterministically if it is closed / pervasive, fight field oxide inversion / charging and so on.
I am trying to implement my own 3D FDTD based on Taflove's book, however I'm running into trouble with my TF/SF implementation. I am attempting to model free space, with no scatterers, yet I am getting significant fields outside the Total field region. I am modelling a 10 GHz sine wave with a deltax of 0.002. I don't expect you to (...)
Hi narayani, For simple static charges, there is no propagation, and the above definitions don't really apply (lambda -> infinity). Therefore, we typically say that there is no far-field region, and everything behaves like the near field.
Hi all I define a sphere in CST MWS and a plane wave as excitation.I want to calculate the backscattered field at different position, from nearfield region to farfield. We expect that when we approach to farfield region, the backscattered field converged to a specific value (...)
Hi all I want to calculate the the scattered E-field in FEKO. I define the Nearfield request at distances from r_0 to r_m which really some of them are in Farfield range. when the sample closed to Farfield region the scattered E-fields converge to 1. I test it for other structure and see (...)
ions which produce electric field Ions don't produce an electric field, they move in the presence of an electric field. I think don't getting the drift current what it really is You have the basics down. The diffusion current goes from the P to the N region while the drift current opposes this with equal magnitude.
In reactive near field the electric and magnetic fields are not orthogonal and any object placed in this region will distort the antenna pattern. This is one clue that could give information where this field stops when moving far from the antenna. For doing this, have to do a far-field antenna pattern (...)
Think of the battery as providing potential energy (electric field) rather than kinetic energy (electrons flow). When a depletion region is created due to the diffusion of electrons and holes across the PN junction, the depletion region becomes an insulator across which there is no motion of any carriers (holes or electrons). So the (...)
I think there could be, if you have second order things like gate poly depletion in play then the field will be divided across the depletion region and the oxide. The depletion, hence the "shielding", will be voltage-asymmetric. This comes down to cases, not theories; in the end and nothing should be assumed when you are setting up a qualifi
If we want to sample a light field (visual scene) by distributing cameras around the light field and each camera sample the region it captures of the light field from its point of view and reconstruct the sampled region of light field for each camera to get a virtual image of the (...)
Dear all, I am planning to simulate, and in a single setup, an FSS-Antenna system. I need to study the effect of different field patterns of a source antenna on the performance of an FSS structure. The simulation scenario has the following givens: 1- An antenna, in both the radiative-near-field (Fresnel region) and (...)
Hello. Welcome to If you keep increasing your forward bias voltage then depletion region become very thin that no electric field will be there any more so no resistance. I am obviously not an expert but I can try to help you because in this semester, I have semiconductor physics course. Regards, Princess
Are the responses of HFSS simulations in Terahertz region valid or not? In the last issue of IEEE Transactions on Terahertz Science and Technology, there was an extensive paper on the use of HFSS and CST MWS at THz frequencies, and the related issues and limitations. I am not working in this field myself, but the paper
Hello, I've managed to develop a FDTD code, in cylindrical coordinates, for studying mode propagation in a cylindrical waveguide. I have to cite that there is no PML region attached yet, so the waveguide is treated as a cylindrical cavity. At z=0 I explicitly set a certain waveguide field distribution, for the Electric field components (...)
Hi, I have a design consisting of a transmitter and a receiver separated by 1 meter and wanted to ask if anyone knows how to plot the E/H field in the region between them or the near field? Thanks
you should avoid near-field region
hi there, its pretty complicated due to so many variables... transmitter power , antenna gain, terrain etc one very good program for plotting field strength over a selected region is called Radio Mobile do some google searching on that name and download the prog and have a play cheers Dave
As far as I know, the RFID antennas work in the near-field region, so you must obtain a good understanding of the behavior of your antenna in the near-field.
any one could you help me to make a n-region of 500?m and p-region of 5?m help me how do i convert these values in electric field concentration :)
Hi, Here is a good lesson on FET's operation. Learn About Electronics - Junction field Effect Transistors - How a JFET works
When NPN transistori is forward biased, electron in BASE region would travel against electric field in BASE-COLLECTOR junction. I read also that it is due to diffusion process which I still don't understand because it is still swimming against electric field. Kindly explain about it, also how does electr
BJTs store charge in the base-emitter junction, and to turn the device from on to off, you have to pull that charge out of the device first. The B-E region has some physical size, and you are limited to the voltage you can put on the base (typically zero volts, but certainly no more than -4 volts), so the electric field you can apply to sweep that
Hi, To be in the far field region, you have to make sure that Radiation boundary will be at a distance of atleast Lamda/4 or greater. For some not so strongly radiating structures it far-field region could be achieved at a distance of Lamda/10. But in most cases, Radiation boundary should always be atleast at a distance (...)
Hi all, I have designed a loop antenna in HFSS using a lumped port. I was observing its radiation pattern in the far field region and noticed that HFSS gives a maximum in the plane perpendicular to the plan of the loop antenna and a null in the plane of the loop antenna. Which should infact be the opposite that is maximum in the plane of the loo
This could be a poly field ring used to shape the depletion region beneath the field. It is used in high voltage layouts and the poly can be floating. The easiest way to tell of it is a field ring is there should be a floating implant region beneath it (beneath the field oxide).
In a p-n junction (at least at low current level), all applied voltage is dropped on the depletion region. Voltage drop on quasineutral regions is zero (or almost zero), and thus the electric field is zero.
What auto date field? If you mean the "Date" Design field then it uses the format your PC uses. check your keyboard & country settings
GIDL: Gate Induced Drain Leakage. GIDL currents arises in the high electric field under the gate/drain overlap region. GIDL occurs at a low gate voltage Vg and high drain Voltage Vd and generates carriers into the substrate and drain from surface traps. (taken from: Kaushik Roy :"Low Power CMOS VLSI Circuit Design")
Hi, How to design an antenna which only receive either the electric field or magnetic field within the near field region. Thanks
In the Reactive Near field region of the antenna the E and H fields are not orthogonal, so any object coupled to the antenna in this region will distort the radiated pattern and affect the resonant frequency.
What is the meaning of the values on the field called "region" on Cadence. You can find this field in DC Analysis when you choose: Results -> Direct plot -> DC Operating Point and than mark any transistor. Can anyone write the meaning of each number in that field?
The antenna pattern will change significantly only if the metal is located into the Reactive Near field of the antenna. Reactive near field is the region close to the antenna where the Electric-E and Magnetic-H fields are not orthogonal and anything within this region which couple with the antenna will (...)
GIDL currents arises in the high electric field under the gate/drain overlap region. GIDL occurs at a low Vg and high Vd bias and generates carriers into the substrate and drain from surface traps or badn-to-band tunneling, (taken from: Kaushik Roy :"Low Power CMOS VLSI Circuit Design")
Thing is that S11 or more generally Sij are only defined when you are considering a mode at the port. This dominant mode is clear for microstrip: the quasi-TEM. For an antenna things are complicated a lot because the power is radiated in many directions as planar waves (out of the near-field region). Their power is expressed in W/m2. You could c
Hi i want to c the field(electric & magnetic) around coil but injecting current to the coil. Difference will come if i use voltage source instead of current source na..interms of field,impedance there any way 2 use voltage source instead of current source????
Dear all, I know that if doping level becomes lower, then breakdown voltage becomes higher. And I understand that reason with energy band model. But I cannot explain that using cross-section. (with terms of E-field, depletion region, electron....etc.,) Can anyone explain me please? Regards, Thanks.
The bird's beak is formed in the LOCOS (LOCal Oxidation of Silicon) Process when oxidizing some regions more than others. The former regions are called the field oxide and the later less oxidized are the transistors' gate oxide. The bird's beak region is the one where the oxide thickness gradually shrinks from large (...)
If the cylinder is in the Reactive Near-field of the antenna, it will distort the dipole radiation pattern. Reactive Near-field is the region close to the antenna where the Electric-E and Magnetic-H fields are not orthogonal and anything within this region which couple with the antenna will distort the (...)
if you mean by the air box that you create for far field region with radiation boundry assigned to it......then its length and width would be same as that of the ground and subtrate....and its height would be above the ground plane about lemda/8 to lemda/12.....its up to you what u want to use for yopur best results..... i am also designing a mi
At pinch off, the electric field at the pinch off (depleted) region is very high. this field attracts the current carrying charges flowing at the channel.
Hello i want to ask that; "what is the difference b/w antenna near field and antenna far field?" Please explain in detail also upload any document (.pdf or other) related to it. Thanks in Advance
No you can?t. The current distribution is proportional to the Reactive Near-field. This is the region close to the antenna where the Electric-E and Magnetic-H fields are not orthogonal and where the antenna gain is not a meaningful parameter, so you can not use for a link budget calculation.
From all antenna types the Loop Antenna (due to its configuration) have the smallest Near field region (in VHF region ~150MHz is less than 1m). The Near field is divided in two regions, Reactive Near field and Radiated Near field. The Loop Antenna inductance, which (...)
Hi, can anyone kindly tell me what is near field antenna ?Thanks in advance. Best Regards Xcy_antenna
When using the TFSF method the scatterer needs to be contained in the total field region. This is unrealistic since most periodic structures contain a dielectric layer which needs to extend beyond the TFSF boundary (as a unit cell). I can probably simplify my life by just doing away with the TFSF method but that leaves me with a problem of injec
Suppose you have a trace on a PCB board (could be antenna, whatever) and would like to visualize the EM field radiated by that piece of metal. Most likely you would be more interested into the field close to the metal and therefore would like the mesh to be more dense in that region. So you could put a dummy object, like cylinder or small (...)