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43 Threads found on edaboard.com: Which Dielectric Constant
Does anyone have an idea of ?how? the dielectric constant of air is determined (calculated)? For example, how do pressure, humidity and temperature affect the published values on . I would like to run some experiments which can adjust the DK of air by varying some of these environmental parame
Go with wired.. Water attenuates RF more than air because the dielectric constant and leakage conductance is far greater. Water is 60~80x air thus shunting the signals more rapidly. The Navy uses VLF from 10~25kHz for communication with megawatt transmitters. witch "shud be" which ;)
Hi all, which type of sensor is more accurate for Paper thickness Measurement (75-85 micron). Thanks,
Search for Stripline design and plug in the numbers given. 104211 Length is based on material dielectric constant and fraction of 0.092 wavelength or conversely the frequency at which it is a 1/4 wave or 1/2 wave. You would want to choose low loss tangent dielectric like teflon , ceramic or perhaps some excellent polyamide
1. Is Er technology-independent which means it holds for 3.9 for all technologies? Nearly ;-). It's the physical dielectric coefficient of SiO2 , i.e. as long as you stay with this dielectric, it is independent of structure size or BSIM versions. Other dielectrics like Si3N4 or Al
for a rectifier board, you do not normally need s parameters unless it is a directional coupler. or microwave you need to choose something like GETEK or a low loss FR4 which has a slightly lower dielectric constant. If you have no board layout software, EAGLE is free.
Hi, The problem is I need to find the surface potential where in the electric fields are elliptic (Fringing fields). I tried to find the solution when there were one dielectric by using con-formal mapping technique which i succeeded. But the problem here is there are two dielectrics permittivity of 1 >permittivity of 2. Therefore (...)
The problem is that there is no explicit definition for the values you are looking for. In my Balanis (3rd Edition), page 821, a rule of thumb is given that you h/lambda0 < 0.1. The largest impact of the dielectric height is the effective dielectric constant, for which he also gives equation 14-1. To my knowledge, the (...)
Hello, i'm supposed to use a Ferro ULF140 LTCC tape with a dielectric constant 14 and Tand=0.001 for my design, which i'll probably have to define myself in Hfss 13. Can anyone point me somewhere i can get information about equations i need for defining new materials? when i try to create new material the values i'm supposed to assing are (...)
Hi everyone, I was wondering which tool is best for model PCB stack up and able to do simulation on the model. We are talking about multiple layer. I would like to be able to change the dielectric constant and dissipate factor for core a on each layer. An example of layout is: Plane Gnd Core Signal Cu pre-preg plane Gnd I (...)
PCB dielectric Coefficient for FR4 is not constant by frequency so that the manufacturers give this coeffcient for certain frequency,temperature and relative humidity.Therefore the dielectric coeffcient which you used to calculate characteristic impedance for PCB traces migh not be correct. In additional to, if the operating (...)
I suggest you use GE FR4 called GETEK which has 10x lower loss tangent than most FR4. W I suspect you are using lossy FR4 and also dielectric constants is much lower at 2Ghz since rated parameter . Also dielectric constant drops 10~20% as f goes up. Return loss of thinner patch may be worse if variations in (...)
which dielectric constant is good? what substrate height is good? It depends on your manufacturing capabilities (minimum gap/line width) and mechnical tolerances. Higher dielectric constant means shorter resonator length. Advantage: small filter dimensions Disadvantage: more sensitive to etching precision
I am making a pcb antenna which has a resonant frequency at 13.56 mhz and which will be etched onto a FR4 substrate These 13MHz "antennas" on PCB are more or less inductors, with inductive near field coupling. They are designed/calculated like other printed regular inductors, and the dielectric constant of the PCB
Hi Everyone.... How can i optimize my antenna in dimension ? Give different way by which this can be done. Please help me......
70551 in the data sheet,there are two different dielectric constant, εr,one is Process specification ,the other one is Design specification。I want to know what?s the difference and when we design a antenna,which should we use in simulation?THX.
Beware that there are many different suppliers, which are interchanged by the PCB manufacturers frequently for cost reduction. Ans all have different dielectric constant and loss tangent. So in short you can only use FR4 in case you can live with these larger variations by taking it into account during the design phase.
As far as I know, the choice of PCB material for microwave circuits entails dielectric constant and loss tangent which result in different size and Q. Maybe airborne system has to take other properties like temperature variations and mechanical strengths as well. Hope this helps.
Hi Everyone, I need help to design a EBGS assisted micro strip dual bandpass filter using insertion loss method.I need to know about design, suitable structure and which dielectric constant will be better for this purpose. Please help me.
Hello CMD, I think that the TDR with COAXP2 is the correct one as it uses your exact physical dimensions(Do, Di) to calculate the characteristic impedance.... (Di, Do. Inner and outer diameters and dielectric constant K are used to evaluate characteristic impedance Zo as Zo = 138/sqrt(K)*log(Do/Di)). Where as the COAXI2 which you used (...)