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22 Threads found on Fringing Effect
In general, the effects of fringing for parallel plate capacitors can be neglected as long as both the width and height of the capacitor are significantly larger then the plate separation, a condition that is easily achieved here. However, the presence of etch holes contributes additional fringing that will a
Hi, fringing fields are always due to the fringing effects and it is always bended. It is like the coupling fields between two microstrips. It is something like that always exists and you can not answer why it exits!!!! But it is there and it does all the magic. Also, the better way of explanation is electromagnetic lines extend (...)
As the gate length becomes very narrow, the fringed electric field area along the edges of the gate (at the source and drain) become the majority of the electric field between the gate and channel. The level 1 mosfet model used to do hand calculation does not account for the fringing effects, it assumes the electric field is straight up and down be
"as far as I know my calculations for p@tch dimensions are correct"=>did you use some simple formula to calculate the dimension for the patch so that it "should/would" resonate at 10GHz? If so, then cosider that there are various assumptions involved with the formula. for example, the loading effect of the feed is not accounted for; fringing (...)
Hi electronics_kumar, I didn't really find anyone who dealt with this problem, but I can propose you a method of thinking about this problem. If you don't want to neglect the fringing effect try to draw the field lines using any graphical method (eg. Curvilinear squares) and obtain the capacitance from there. A very comprehensive approach to
normally the parasitic capacitance can be modeled by the parallel-plate capacitor model (also called area capacitance) and fringing capacitance, the total capacitance is the sum of pp capacitor and fringing capacitance for detail, you can study Digital intergrated circuits:a design perspective a design perspective Jan M.Rabaey by the way, no
Hello all, I am glad you read this topic. And I will appreciate if you give me any suggestion. I was wondering how to simulate the RF input matching correctily if you want to do a good RF input matching on PCB. I simulate some matching circuit but I found the simulated circuit had bad performance on PCB. Is it because I don't have correct pass
Hi, SagSag: I am not sure whether there are serious guidelines for it. I would like to make a few comments. 1. Aperture coupled antennas are too complicated for a good analytical solution. It is not easy to give some simple guidelines based upon analytical formulas. I think you do need EM simulators for them. 2. The guideline should depend
this kind of antenna is based on microstrip line and uses the fringing effect as a radiation mechanism. you should open an antenna boolk (balanis, pozar) for more detailed explanation, or google it :-)
1. If you understand how the microstrip antenna work then you also know the answers for your questions. So first try to understand how a microstrip antena radiate. ANd how is the electric field oriented inside and just outside the antenna? What happens with the electric field if you increase the height? The electric field is normal to the surfa
Calculating the reluctance of the magnetic circuit is a visual method to find the inductance. I guess you know about AL factors of magnetic cores. According to the reluctance model, you can assume 1/ALgapped = 1/ALungapped + k*sg (sg is the gap width, k a constant) Due to fringing fields
well, of course. If you have a microstrip patch antenna, for instance, you must forshorten the patch length x width to compensate for the fringing capacitance along the patch edges. Otherwise it resonates lower in frequency than desired.
Loss of ?strip depend by the conductor loss and dielectric loss. In most cases the conductor loss dominate the dielectric loss. As the current is more distribuited as the metal loss, of course, decrease. So larger is the W as the dissipative loss is low. ... but... as large is W as large is the fringing capacitance, so... pay attention to the
in MLEF the end effect of the open line (fringing capacitor) is taken into account but in MLOC it isn't.
There is no reason not to use right angles. This is an audio board, and right angle traces have absolutely no effect on signal quality. If you have been taught that right angle traces are always bad - you have been taught incorrectly. In fact, when necessary, right angle traces can be used on controlled impedance RF boards with NO measurable e
This is usally the case - top plate is gate material, and bottom plate is the mosfet tub which is always bigger than the top plate.. You can estimate it simply by using just the area of the gate region, or if you want to get fancy, you can include the fringing capacitance around the periphery of the gate region.
The calibration kits suitcase contains the standards, and the standards description. The standars descripion may be a paper and/or a diskette (or a tape for old 8510). The paper can by used everytime almost on all VNAs while the diskette only on the appropriate VNA. The data conteined on the diskette is the same conteined on the paper. Every f
A.Anand Srinivasan, Another configuration of stranded wire is "Litz" wire. Litz wire consists of many strands of small diameter insulated wire. The idea is to limit the effective diameter of each strand to the depth of the skin effect at a given frequency. By insulating each strand the current is forced to remain within each strand of wire. Th
Hi Guy i have figure out the answer myself, please correct me if i am wrong. 1. Why should we separate 2 metal lines far apart? Except to avoid shortening and crosstalk. Apart from that, due to the inefficient/nonideal in fabrication process, the edge of the metal is not a straight line. However they are like a "saw". So this may cause both
Hi, I am trying to use microstrip lines structures to build up TRL standards for calibration from 1GHz to 40GHz. (1) Is there anything I should be careful about the length of the "Thru" standard for wideband measurement? (2) I am wondering that for the "Reflect" standard, is it necessary to compensate the open end effect which is from the fringi
The radiation of patch antenna is due to fringing fields from transmission line model. The current varies in width depending upon patch type. As an example the equvanlent currents in square patch in diagram varies sinθ and oppoiste in other direction. This field also varies depending upon the type of resonant mode that depends on the antenna
Design is done with equations, but you have to harvest your equations from various sources and basic understanding of EM theory. If you want to design a new antenna geometry (so not using a recipe), you mostly approximate the structure with lumped circuit and/or transmission line models to get some idea of current distribution, voltage distrib