Questions tagged [dielectric]

A dielectric is an insulator that can be polarized by applying an electric field. A common example is the use of a dielectric within a capacitor between the metallic plates to increase the surface charge.

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3answers
139 views

How fast is DC current/voltage?

The standard way to calculate the speed of information (current/voltage, EM wave) through a dielectric medium (like PTFE or fiber) is to determine the relative dielectric constant, and compute the ...
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2answers
50 views

Calculating the permitivity of PCBs

I've read that the permitivity of FR-4 is around 4.5, however I would like to measure the permitivity of an actual double sided copper clad board, the way I am thinking is to measure the thickness of ...
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1answer
53 views

Can you use 'Rubber,' Specifically Liquid Electrical Tape Between The Plates of a DIY Capacitor

The above is pretty much all there is to the question. By "can you," I mean will it be properly effective / are there any tips? If not, why? It seems that this ought to work, but I can't ...
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Can I calculate minimum rise time of a transmission line if I know the length and the loss tangent?

Overview: I am trying to work out if it's possible to transmit my 1.2Gbps MIPI data down a 600mm long flexible PCB strip. Assuming I have the impedance correct, will the signal still be degraded by ...
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20 views

Effective Medium approximation of wet asphalt

So I'm trying to model the effects of wet and dry road surfaces for mm wave communication. My first attempt was to model the road as dry asphalt covered with a thin layer of water, but I'm not sure ...
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1answer
22 views

BIL, Dielectric Breakdown, Shrink Wrap, and Safety. Is there a resource for this information?

I am currently working with a system that produces high voltage transients for system testing, and have some cables that need to be made/modified to work with some new equipment. The operating ...
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1answer
61 views

What material should I use for the plates of my homemade mica capacitors?

I recently acquired some mica as i want to build my own high voltage (50 kV if possible) capacitors. The problem I am encountering right now is that the surface of such a crystal isn't perfectly flat ...
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2answers
143 views

What material can I use as a dielectric in my own high voltage capacitors?

I need capacitors rated for 50 kV. Buying them is an option but the ones with appropriate voltage rating I have seen cost more than 50€ which is far too much. That's why I want to make caps on my own ...
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1answer
40 views

Relation ship between Track width, Impedance, Dielectric and copper thickness

I like to know the relationship between different factors like track width, impedance, dielectric and copper thickness. After quite a reading I got to know that as the track width of a cline is ...
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1answer
105 views

How come distilled water hasn't replaced transformer oil as a high voltage insulator?

I've noticed that distilled water has an extremely high dielectric straight (65-70 MV/m). With that considered, how come it isn't used in the place of transformer oil for 10-20 kV applications where ...
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1answer
93 views

PCB Layer Stack Dielectric Constant Math

I have a question reference PCB layer stack and the adding multiple dielectric constants together. The image and description below should help clarify the question: The differential pair will be ...
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1answer
67 views

What are the “poles” of a signal (after it's reflected perhaps)

I desire to learn about "estimating the poles of a resonant signal", specifically the complex natural resonance of objects. However, I don't know what "poles" are. What would you suggest I look up ...
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1answer
85 views

HF characteristics of Liquid Electrical Tape

Some self-wound toroid inductors from a HF-radio kit are sitting a bit too loose on their PCB for my liking; they stand upright and are only held in place by the thin enamel-coated inductor wire that ...
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1answer
64 views

How can the dielectric constant of water be so high but water on electric devices can cause a short circuit? [closed]

Is it only the fact that pure water has a high dielectric constant and non-pure water i.e. the water that usually causes a short circuit is contaminated and it's the contamination mixture in the water ...
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1answer
177 views

C0G vs polypropylene capacitors in signal filtering

Can anybody give me a comprehensive pros and cons list or explanation about the differences between C0G (NP0) ceramic and polypropylene capacitors? I would like to use them in signal filtering and ...
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70 views

Grounding polycarbonate or Plexiglas

If a record turntable's base is made from a 2" think piece of acrylic (for instance polycarbonate or Plexiglas) can it be successfully grounded to eliminate any static charge that it would build up in ...
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27 views

termination of a parallel wire differential transmission line as delay line on variable dielectric constant medium

Well this has quite a long title, lets explain the situation I'm currently working on the design of a sensor to measure the dielectric permittivity of a liquid medium, the idea is to use a ring ...
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1answer
38 views

PEC-backed dielectric material

For the paper named "Antenna Miniaturization and Bandwidth Enhancement Using a Reactive Impedance Substrate" the statement "PEC-backed dielectric material", so what is the meaning of this statement? ...
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3answers
103 views

High voltage dielectric breakdown & layering insulators

I’m going to use 230 kV as the reference voltage for the example below; I know if I put a piece of metal too close to a 230 kV source it will breakdown the air and jump to the piece of metal causing a ...
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239 views

Capacitance of circular parallel plate capacitors

I've been trying to solve this question for a while now , but I can't seem to get to the written solution. Question : Calculate the capacitance of a parallel capacitor having two identical conductor ...
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1answer
52 views

Dielectric Loss for Constant Impedance

Are dielectric losses the same for two different 50ohm structures that are built in the same dielectric medium? Eg. Two 50ohm Stripline traces in FR4 where one is very skinny with close GND planes, ...
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0answers
525 views

What would be the combined dielectric constant of two dielectrics in series?

Let's say we have two parallel conductor plates. In the middle, there is not one but two layers of dielectrics made of different materials. If we know the relative permittivity of each dielectric, how ...
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4k views

What lubricant is suitable for switch contact?

I have this expensive DPDT switch (20A 250V 2hp) which the only problem is dirty encumbered inside. The encumbrance is made of carbonized material and some kind of wax and dirty electrical contacts. ...
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1answer
30 views

variation of thickness of dielectric layer for different textile-based capacitive pressure sensors

For my thesis I am working with textile-based capacitive pressure sensors and I am struggling to see how much variation in thickness of the dielectric layer you can have before you have noticeable ...
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1answer
137 views

How far does reforming a capacitor help? Does it have any adverse effect on using such a capacitor on components?

I read a few articles on the internet about reforming capacitors. Does this actually apply only to a capacitor that was stored during a certain period of time or can it be used on any electrolytic ...
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3answers
625 views

Coaxial cable: how is it possible to define a conductance?

I have a coaxial cable with internal conductor of radius r1 and external conductor of radii r2 and r3. The material of the conductors has a conductivity \$\sigma_1\$. Between the conductors there is a ...
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1answer
579 views

What impact, if any, does the solder mask color have on the electrical and mechanical properties of a PCB

At my place of work, we use soldermask colors as a sort of poke-yoke for manufacturing purposes E.g. Technicians know that green pcb goes with green, blue pcb with blue, etc. This has lead to some ... ...
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1answer
47 views

Decide coherent time and fade duration through empirical studies on the channel and relate them to channel modeling

I. Scenario: TX floating in the lossy heterogeneous medium with undetermined positions within a limited region; RX fixed in the air and closed to the boundary of air-lossy medium; Frequency: 500 MHz ...
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2answers
66 views

Suggestions on conductive materials for textile capacitive pressure sensors

I am doing preliminary research for my thesis. The thesis involves textile capacitive pressure sensors. I am trying to find out more about how the type of conductive material used affects the ...
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1answer
154 views

How does glass create an electric field?

I'm reading from Microchip's data sheet regarding their MAXTouch microchip, which details on how to create a touchscreen compatible with their chip, and in discussing the "mechanical stackup" of a ...
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1answer
233 views

Capacitor dielectric: Is X7R a direct upgrade over 2C1?

I'm trying to replace a capacitor with an IECQ-CECC 2C1 Dielectric. The supplier has offered a comparable EIA X7R Dielectric. Viewing this comparison document, they are largely identical. However, the ...
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2answers
96 views

Material with fairly high resistivity, but allows flow of charge

Is there a material with fairly high resistivity (at least semi-conductor level), but also allows the flow of charge through it (and subsequently to the ground)? The flow of charge does not need to be ...
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1answer
55 views

How does same capacitor with different dielectric affects the circuit?

I am working on a project and finalizing 0.1uF capacitor with 50VDC(decoupling). I am finding with different dielectrics. My question is how does two diffrenet capacitor having same capacitance and ...
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3answers
135 views

Capacitor dielectric and current flow [duplicate]

A capacitor has insulating material between plates and this insulting material does not provide any electrical or conducting path between capacitor plates. But still, capacitor allows DC or/and AC ...
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5answers
173 views

Confusion regarding effect of dielectrics on energy stored in a capacitor

If inserting a dielectric has the effect of reducing the magnitude of the electric field in a capacitor (holding all other variables constant), then why is the energy stored in a capacitor directly ...
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1answer
246 views

Use AD5933 evaluation board for impedance calculation 1Khz-100kHz

I recently got the AD5933EBZ evaluation board. After taking a look at the user guide, the AN1252 application note and the datasheet of AD5933 itself, I am trying to measure the capacitance across a ...
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4answers
168 views

What is the correlation between dielectric plates and capacitance? [closed]

A project I'm working on requires a capacitor of 37000 uF and a voltage rating of at least 10kV, but every capacitor I find online can only meet one of these standards and is very expensive, so ...
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3answers
271 views

Electrical generator where a dielectric is pulled out of a capacitor

In physics class I learned that removing the dielectric out of a charged capacitor increases the voltage and therefore the energy stored. Could this effect be used to build a generator? The extra ...
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1answer
156 views

Phased array minimum size

I want to know two things,how big does the phased array needs to be to form proper beam and what is the smallest area the beam can be focused.I learned little bit about lasers and with focal lense,the ...
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1answer
2k views

What is electron trapping

I am reading an article in which they consider a model for charge transport in dielectric. The following figure can summarize the different procedures done in this manner: I am new in the domain ...
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1answer
244 views

Dielectric Transformer Oil

Which commercial oil can i use for isolation of a high voltage transformer+voltage doubler?.The output voltage is about max 60kv.
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1answer
55 views

Side effect of dielectric polarization

Sorry for my obvious question, but I am not from the field of electronics and electric engineering. I was reading this article: The first sentence in the introduction says: " All solid ...
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1answer
2k views

Pros and Cons of Types of “Dielectric Grease”

I have come across two different types of dielectric grease. One, the "usual" kind, is a silicone grease that has added insulators. Another, less common, is a hydrocarbon grease, typically ...
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1answer
48 views

Technology “dielectric constant” information

OK, so when working in a technology, say Bipolar, to build a high frequency amplifier, can I trust that the dielectric constant info for the various films contained in the electrical design rules, are ...
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0answers
236 views

Installing (and soldering to) PTFE (teflon) Insulated Terminals

I am doing a condenser microphone board project. Now I need to install two PTFE insulated terminals (these are in the picture) to a board. The holes are a little larger than the bushing of the ...
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4answers
3k views

Confusion in understanding the relation between permittivity and capacitance

The insulating medium between the capacitor plates is called dielectric. This appears in the Coulomb's law: $$F = \frac{q_1 q_2}{4 \pi ɛ r^2}$$ ɛ is the "permittivity" constant which depends on the ...
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2answers
932 views

Understanding surface and volume polarization charges

Can someone please give me an intuition of this formulae? I am unable to visualize the formulae in equation 5.26. Specific question - How does a dielectric when kept in an external electric field ...
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2answers
166 views

question from capacitors

A capacitor of capacitance 1uf withstands maximum voltage 6kv while a capacitor of 2uf withstands maximum voltage 4kv. What maximum voltage will the system of two capacitor withstands if they are ...
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1answer
283 views

Mutually Insulated Circuit

I am reading through a HIPOT / Dielectric Strength requirement that states in no so many words: "withstand damage when 1KVac is applied between all mutually insulated circuits" I search every where ...
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3answers
729 views

Material whose dielectric constant * [dielectric strength]^2 > 20,000,000,000

I'm looking for a material or compound, whose dielectric constant multiplied by the square if its dielectric strength (MV/m) is greater than two billion at temperature from -20C to 100C. It doesn't ...