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1000 Threads found on fr4 Loss Tangent
fr4 loss tangent is 0,012 - 0,019
Some years ago, we measured some fr4 material for a 0.9-2.1GHz power splitter application. For our material, the extracted epsr was 4.7 (!) and the loss tangent was 0.027 at 2GHz.
Normally, the angle is in degrees. For your problem, loss tangent = tan(.01deg). A reasonable approximation of the loss can be found as: Dielectric loss(dB/in) = 2.3 x freq(Ghz) x tan(delta) x sqrt(Er) This relationship assumes that the metallic losses are much less than the dielectric (...)
silicon's loss mechanism is not same as dielectric loss. For fr4 material, the DC conductance is zero while AC electrical field will incur loss. Silicon's conductance in DC is not zero. And that means the loss mainly come from the conductivity of the material.
If "cardboard" is meant to refer to a technical printed circuit board substrate, it would be a good idea to use a sligthly more precise specification. Generic fr4 has a loss tangent specification of 0.035 @ 1 MHz.
Hi all, I simulated one UHF patch antenna with fr4 sub and found the much impact of the loss tangent. When loss tangent is 0.02, the Gain is only 1.2dBi,efficiency is only 28% .When i changed the loss tangent to 0.002, the Gain is 5.8dBi and the efficiency is 80%. My (...)
Hi All, Anyone has idea on how to convert conductivity to loss tangent or vice versa?? For a si wafer, with conductivity 8S/m, what is the loss tangent at 10GHz?? Mesfet+
I am trying to simulate a CPW on a high-resistivity silicon (5000 substrate. I am wondering what will be the correct value for loss tangent of this substrate. Can anyone tell me if there is any reference to look for?
dear.... what's the physical meaning of loss tangent ( tan δ)? is loss tangent same with dissipation loss of dielectric? what r the differences of loss tangent, dielectric loss and dissipation loss?? im confused when i read (...)
Hi, CAn anyone please provide me with the loss tangent values for Gold at IR wavelengths. Any help is appreciated..... Thanks
Hi All, As a part of my Masters project I have compare the frequency increase of multi resonant patches as compared to single patch. I found that by incresing the loss tangent of the dielelectric substrate I could increase the bandwidth (VSWR <= 2) of the multi resonant patches by significant amount, however the gain and efficiency decreased con
Hi! Anyone has an idea where I can get electrical properties of GaN and AlGaN particularly loss tangent? My freq. range is 50MHz to 10 GHz.
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 as loss tangent can be expressed as tanδ=σ/(ωε) so it decreases with frequency. but i also heard that loss tangent will increase over frequency. e.g. page 16 of Cam Nguyen's "Analysis Methods for RF, microwave, and millimetr-wave planar transmission line structures" so am I missing something here?
Hi people, Typically what is the conductivity / loss tangent of CMOS grade Si (Silicon) at 20 GHz ? Thanks svarun
Hi people, Typically what is the conductivity / loss tangent of CMOS grade Si (Silicon) at 20 GHz ? Thanks svarun
Hi all: where can I get the material loss tangent information ? Any good website to find ? thanks a lot
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..........
We know at frequency below plasma frequency of metal the Im(permittivity ε) is large, and/or the Re(ε) is large bu negative. according to the Debye's function: ε(ω)=ε∞ - (ωp?)/(ω? +iωγ) => ε=ε' +iε'' Now, I wanna simulate accurately metal SRR in the gigahertz region, so I
Can anyone please tell me the approximate dielectric constant and loss tangent of a plain window glass ?
Hi, Does anyone know if there is any close form to compute the effective loss tangent of CPW line based on the line width and gap? Any help will be much appreciated. Thank you.
hi friends what is the loss tangent of 4 inch silicon at 10 -40 GHZ?
Or does HFSS calculate it for you? I only entered the permittivity and conductivity for the dielectric material. Also, the solution frequency is entered. So, I assume HFSS can calculate loss tangent using tan δ = σ/ωε. Is it going to affect the results much leaving it out? Thanks.
Hello, I am trying to simulate a breast model using XFDTD and excite 17 monopoles on the breast surface by using modulated Gaussian signal. My problem is when I use the option for the source waveform, I don't know what to choose for the "surface conductivity and loss tangent frequency", please give me any suggestion. My central frequency is at 6
What is the magnetic loss tangent of non magnetic materials? I have a feeling it is 0. But it could be 1, or it could vary (between 0.5 and 1.5 it said in something I read, 1.5 if it is a lossy material?), what is it? Also does it vary with freqency? Thanks jhs504
what is loss tangent impact on microstrip antenna..????
hi all! is there any material that has more losses (loss tangent) than water in the frequency range ? thank you
Can anyone tell me the value for loss tangent of Silicon dioxide (SiO2) and Silicon (Si) at 193.5 THz. I have read a lot of literature but the closest value I could find was 0.005 @ 10 THz...Not greater thn this.. Kindly reply. Regards
hi all! can anyone help me to design a 2.45 GHz three-way power combiner on a fr4 board with substrate permitivity of 4.7 and thickness 1.6 mm, loss tangent 0.0025, copper height is 0.04 mm. impedance is 50-ohm. I only have Ansoft and CST for simulations. i'm kinda new to this but i've already done some research and found out that's (...)
hello all, i have research in WLAN antenna n i need fr4 with spec loss tan 0.0001, ephsilon r 2.2 n thick 0.8mm i need fr4 for subtrate. any one have information about it? where can i get it? thanx b4
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.
fr4 is not one kind of PCB material - it is an entire class of flame retardant glass and epoxy type board materials. Depending on the resin type and content, an fr4 board can perform quite nicely to 4 or 5 GHz or even higher (there are even 9 GHz backplanes described on the web that were done with fr4). Dielectric constants can vary (...)
Make a search of the board on fr4. This topic had been discussed many times here.
dear all. when i simulate the cpw antenn with fr4 substrate the gain is not uniform over the band of frequencies. what might be the reason? how to correct it? also i need what is gain bandwidth? impedance bandwidth? pattern bandwidth? also what is the permittivity of fr4 with loss (...)
fr4 is not just one kind of dielectric. You need to find out what brand and model of fr4 is going to be used. You can then go to that manufacturers web site and download the datasheet which will give you the loss tangent and Er.
dear roommates i'd like to know the parameters of fr4 εr:? thickness:? Tan delta:? I'm in hurry. thanks in advance
Hi , I would like to know what are the fr4 PCB's available in the market with permittivity & height. Please let me know lower,higher value of both. thanks a lot
I tried fr4 at 5.8 ghz recently, and it was a total failure. I would recommend against it! RO4350 or Megtron6 would be much better.
I know that for fr4 the εr value decreases with frequency. I want to measure the εr at low frequency by measuring the capacitance of a sheet of fr4 and then estimate εr at 1 GHz. -- this would be more precise than using the "standard" value of 4.6 . Do you know the actual relation for εr[/
The rogers program does allow custom parameters to be used. Just edit the parameter values. For fr4 the esubr is 4 and the loss tangent is about 0.02
Diel Const of fr4 can vary from 4.3-4.8 from batch to batch. And is temperature sensitive as well. loss tangent can vary between 0.018-0.030, depending on number of layers, board thickness, etc. Using fr4 as substrate for microwave circuits, requires tolerance analyses of the fr4 parameters in a (...)
Definitely the reason of poor S21 at those frequencies is the fr4 material. For higher frequencies you can use one of these materials from Rogers: Curves lines usually are used in broadband splitters to minimize the total physical length.
For example, I have a silicon substrate with a known resistivity value. Can someone help to describe the experiment requirements or procedure?
PCB is not visible. Try to post once again. If substrate is fr4 (as it seems...) increase to 0.02 the loss tangent (more similar to real value) and see if it oscillates. Use, instead of ideal passive components, vendor library component models (Q and SRF can be important). I hope it can help. Mazz
You don't choose the thickness of the material to control loss - you choose the thickness of the material to control the impedance of the transmission path for a particular trace width. The losses in the dielectric are a function of the material, and not the thickness. High Tg fr4 resin is available with an Er of about 3.7. That is (...)
Dear all, I have questions about the laminate materials for RF circuits/antennas. I know that the cheapest material is fr4. However, its loss tangent Df is very high (@0.018). Are there any other materials with low cost and low loss tangent? Roger series are more expensive than I expected. Thanks,
if i have two layer (fr4) , i want to know how to calculate trace size with 100 ohm impedance . hope advance person can help me . thanks !
is AT414118 a transistor? i don't from which company it is, but it should have an evaluation board from the manufacturer probably also on fr4.
Diel const of fr4 can vary from 4.3-4.8 from batch to batch. And is temperature sensitive as well. loss tangent can vary between 0.018-0.030, depending on number of layers, board thickness, etc. Using fr4 as substrate for microwave filters, requires accurate tolerance analyses of the fr4 parameters in a (...)
hi guys i'm dealing with a bandpass filter design for my final year project. I have 2 substrates for hardware fabrication : fr4 (er=4.5) and Rogers3010 (RO3010) (er=10.2). The filter is designed for center frequency 2.5GHz and my main goal is overall filter size reduction. Which of the 2 substrates mentioned would be more suitable so