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1000 Threads found on edaboard.com: Dielectric Constant fr4
fr4 is not a good material to use at 1 GHz. Use high frequency materials that has a more stable dielectric constant with less loss.
Anyone pls tell me how to find the dielectric constant of an unknown fr4 board using microstrip line... Then if I have a Er =4.7 fr4 board @ 100 MHz ... anyone can tell me how to find the Er of this board at 4 GHz. Thanks.
hi. as i could find out, most of the fr4 manufacturers give the dielectric constant at 1MHz in the datasheets. some of them provide the Er at 1GHz. if my board works on 400MHz (also not exact, because its a digital signal, so it has a spectrum...), then i can only estimate the Er, so my impedances on board will have a big tolerance. (...)
Hello vpmedina I think that dielectric constant of a laminate is independent of its thickness. But about fr4, it's produced by various companies in the world. You can find them by googling web, then you can find dielectric constant of their laminates in the datasheets. But as a rough approximation you can (...)
Hi all, My 1 mm fr4 board warps all over the place when heated. Do u know of a cheap PCB substrate with similar dielectric constant to fr4 but is stiffer? Thanks You have to compromise either on the price or the quality. Naturally you cant expect sugar at price of salt. :D Cheers
I am making a pcb antenna which has a resonant frequency at 13.56 mhz and which will be etched onto a fr4 substrate What value for the dielectric constant am I looking for in the substrate at this frequency and why? how can I determine the dielectric constant at a 13.56 mhz given the (...)
From 0 to 100 Celsius there are just slightly variation of dielectric constant vs temperature:
you can mesure your own pcb dielectric using this way: 1-obtain the 2 layer pcbof area A 2- connect two wire in two side of PCB 3-using LCR meter and mesure the value of capacitance 4- using the formula of parrallel plate capasitor C=e0erA/d
It is a very simplistic papaer, using closed form equations to approximate microstrip impedances. No attention to microstrip disconinuitites was made, such as end effect, connector effect, radiation, dispersion, ........ And, could be a mistake in the equation derivations too. Better transmission line type dielectric measurements utilize a s
the material will be used for printed circuit style design housing a patch antenna and its feeding network material was chosen by customer however this material is not a typically used in microwave applications ie there is no dielectric constant data taken for microwave frequencies
Hi, all I'm looking for 8O material with relative dielectric constant 50~100. Would somebody give a hint for Any popular material ,except water. THX linjyh
Hi, I think the ring resonator method is best suited for your problem. I don't have time now to search for the papers, maybe this hint will help. The essence is to couple input and output striplines to a 1-wavelength ring resonator resonating at 1-2 GHz. It will have sharp resonances repeating at almost equidistant frequencies as well. You ca
assuming you have network analyzer. with time domain capability make microstrip line with two discontinuities in it located L mm between them. From measuring the time domain response. you will get the time difference between the two points as it propagate in air. Now calculate the distance in air D = dt x c. c=light vel. L / D or D / L will g
Here you can find the methodology how to measure the dielectric constant. Is a relative measurement between two capacitors. One using air dielectric (Er=1) and one using your unknown dielectric.
For the parallel plate method (AL0117 and frannk), one should know, that it gives only a low freq. dielectric constant (at the freq. of the capacitor measurement, in the kHz or MHz range), and it do not give any info for the GHz range dielectric constant ! g579
it can help to get dielectric constant of another materials PL
I am designing a microstrip patch on a substrate which will be air spaced from a microstrip feedline under it. How do I calculate the composite dielectric constant?
If you have only one terminal just use the driven modal solver. To get the impedance and effective dielectric constant it would be very tedious to do it on HFSS you may use other fre packages such as linegauge from zeland software
Hi, u guys know how to find effective dielectric constant with given of Impedance(Ohms)? i know there is a table of Data From various Microstrip Lines in the feed Network. U guys know where to find? pls help?
what is the higher limit of dielectric constant Er value simulation using Electromagnetic Simulator ! I am working on er>100 materials, for filter design using EM CAD...which vendor EM simulator is good for such applications?
hi all, i need a substrate with dielectric constant 2.22 loss tangent = .0009 thicjness = 3.175 mm ( RT DUROID) is it available in india? if u know any contact to get it, plz inform me.
Hi all, I just want to know what effect the dielectric constant of the substrate has on the 'L' of a spiral inductor. Can it be said that only 'C' depends on epsilon and not 'L' ? How about 'Q' ? Thanks svarun
For example, metal(silver,gold) has dielectric constant, epsilon of negative ε1 and low positive ε2 in optical frequency. ( ε=ε1+iε2,ε1=n?-k?,ε2=2nk where n is refractive index,k is extinction coefficient) So I want to set the dielctric constant of negative. Do you know the methods? Software is (...)
how does the dielectric constant and thickness factors of substrates affect the performance of the design ? thanks
Hi, GoaGosha: One thing you can try on IE3D to speed up the simulation is to use finite dielectrics for the thin layers. If you have multiple thin layers, it certainly will slow down the simulation. IE3D V12 has much improvement on it. However, it will still be much slower for multiple thin infinite layers. However, as an alternative, you can tr
I've been told that there are ceramic based PCB substrates with dielectric constant as high as 30+. I've tried searching for such material without success. Does anybody know if such a substrate exists commercially? Do you mean ceramic loaded PCB such as TMM10 or hard substrates for thin films? Here is the latter: www
We have a collection of target assemblies that are used to validate our computational software. A few assemblies consist of rectangular and cylindrical microwave resonant cavities (which are basically implemented as just terminated copper tubes and boxes with sma connectors). We had a somewhat unusual idea to use these same microwave assemblies for
what if you measure capacitance of the PCB? then you can extract the dielectric constant from the formula for capacitance C = εoεr*S/T D.
Hi, hf1357: 1. At this time, you can't define the dielectric parameters as equations of other parametres. 2. However, on IE3D, the dielectric parameters (except thickness) can be defined as functions of frequency. Best regards,
Grid resolution should be no larger than lambda/10 where lambda is the smallest wavelength of interest inside the materials with the highest refractive index. You can choose your grid resolution this way: 1. Compute refractive index: n = sqrt(er*ur); 2. Compute the absolute value of the real part of the refractive index: n = abs(real(n
Hello all. It is very easy to get the dielectric constant at low frequencies. Just take a non-etched 2 layer square peace of your PCB material. Use a simple multimeter (like Fluke) which is able to measure capacitance. Measure the capacitance of your peace of PCB and then use the standard parallel plate capacitor formula to find the (...)
A simple way to calculate the effective dielectric constant of a transmission line is to use the unwrapped phse of the S21. The phase of S21 is electrical length of the transmission line in degree. So, you can plot the effective dielectric constant versus frequencies by adding an expression of the output variable as shown (...)
I searched by google and it said that about 3.6@1k and 3.2@1M.But no one refer about the dielectric constant of PET at 900M or 1G.Does anyone here know?I was looking for it for a long time. Thank you in advance.
Dear All; I have empty board and I need to measure the following in lab 1-the track impedance in high speed (Z0) 2-the dielectric constant (εr) Please suggest me the needed tools and the calculation equations? Any document speak about the lab measuring? Thanks.
Hello All, Can any one help me, how to measure the dielectric constant and Loss tangent of PCB substrates? Also the setup for the same? I will be Thankful, if upload any papers and tutorials..........
Hello All, Can any one help me, how to measure the dielectric constant and Loss tangent of PCB substrates? Also the setup for the same? I will be Thankful, if upload any papers and tutorials..........
A good high dielectric laminate (from Rogers Corp for example) do not have the tolerance at 10GHz higher than +/- 0.5% Only the laminate manufacturer can tell exactly the Er variation vs Frequency (in volume production) because this is dependent by each material used.
How to construct coaxial structure of dielectric constant(Epsr 2.2) in IE3D (Note: In coaxial Structure, explained in manual there is no specific dielectric constant defined. how to define it?
Why fringing field of the microstrip antenna is bent at the edge of the patch and from where the concept of the effective dielectric constant came????????
use TDR to measure velocity then derive dielectric constant.
Hi , for all I'd like to know the realtive dielectric constant of clay at microwave range please, the refernce title thanks for all
How do I measure the dielectric constant of a substrate using a microstrip line? Someone said that I could layout a microstrip line on a the substrate backed by a ground plane and use that fixture to do the measurement. any help or comments are welcome regards
Hi.. I´ve a presentation of a patch antenna in September in my university and i was thinking to protect the antenna with Acrylic sheet´s, but i cant find any information about the dielectric constant of Acrylic.. -Anyone knows the dielectric constant of Acrylic? -how can i measure/calculate the (...)
Can anyone please tell me the approximate dielectric constant and loss tangent of a plain window glass ?
Hi all, Plz, I im looking for the dielectric properties (e', e'') of Carbon Black at any freqeuncies btween 1-10 GHz thank u very very much
plz tell me how can i design dielectric resonator setup for measurement of dielectric constant of ceramic material? how can i couple power to dielectric resonator? plz tell me
Hi, I work on an electrically small microstrip antenna. My first step is using high dielectric constant materials for reducing antenna's size. However, I didn't found dielectric materials from Rogers or Arlon that their dielctric constant is more than 10.2. Therefore, my question is whether there exist (...)
There are following laminates with dielectric constant demanded for your purposes: Rogers 5880, Neltec NY9220, Taconic TLY-5 or Arlon DiClad 880, Arlon CuClad 217 LX, Arlon Isoclad 917 (but Arlon I once again would specify on datasheets)
I am trying to model a dielectric constant of a conducting polymer versus frequency. I am a very new HfSS user v.11. I read in some references that this is possible. I should need a rectangular prob. I have no idea how to proceed. please help