dielectric loss वाक्य
उदाहरण वाक्य
मोबाइल
- Good dielectric materials such as glass have extremely low DC conductivity, and at low frequencies the dielectric loss is also negligible, resulting in almost no absorption.
- However, at higher frequencies ( such as visible light ), dielectric loss may increase absorption significantly, reducing the material's transparency to these frequencies.
- However it is often found that the dielectric losses in FR4 are too high at microwave frequencies, and that the dielectric constant is not sufficiently tightly controlled.
- In a real directional coupler, however, the insertion loss consists of a combination of coupling loss, dielectric loss, conductor loss, and VSWR loss.
- Another source of resistance is dielectric losses from the penetration of radio waves into the ground near the antenna due to the large skin depth at low frequencies.
- Dielectric loss is caused when the insulating material inside the transmission line absorbs energy from the alternating electric field and converts it to heat ( see dielectric heating ).
- The dielectric losses increase in this order : Ideal dielectric ( no loss ), vacuum, air, polytetrafluoroethylene ( PTFE ), polyethylene foam, and solid polyethylene.
- The charges may be separated by a considerable distance and therefore make contributions to the dielectric loss that are orders of magnitude larger than the response due to molecular fluctuations.
- Once the complex permittivity of the material is known, we can easily calculate its effective conductivity \ sigma _ e and dielectric loss tangent \ tan \ delta as:
- These are the terminal resistances, the contact resistance of the electrode contact, the line resistance of the electrodes, the electrolyte resistance, and the dielectric losses in the dielectric oxide layer.
- In long distance rigid coaxial cable, to get very low dielectric losses, the solid dielectric may be replaced by air with plastic spacers at intervals to keep the center conductor on axis.
- A good example is his illustration of the matrix of rising edges that result from different combinations of skin-effect and dielectric loss which illustrates PCB design problems one encounters at microwave frequencies.
- This both reduces the size and power requirements of the energizing source and increases the resolution of the resistive component ( near DC component ) of dielectric loss ( not the capacitive component ).
- :: If they are real world capacitors there are dielectric losses ( leakage current ) and series resistance ( ESR ) . http : / / en . wikipedia . org / wiki / Capacitor.
- Dielectric heating of liquid water is also temperature-dependent : At 0 �C, dielectric loss is greatest at a field frequency of about 10 GHz, and for higher water temperatures at higher field frequencies.
- The ESR, composed out of the dielectric losses caused by the changing field strength in the dielectric and the losses resulting out of the slightly resistive supply lines or the electrolyte depends on frequency and temperature.
- Since the dielectric constant, dielectric loss tangent value, and volume resistivity are high, the corona resistance is not very good, and it is generally suitable for medium or low voltage and low frequency insulation materials.
- The charges are often separated over a considerable distance ( relative to the atomic and molecular sizes ), and the contribution to dielectric loss can therefore be orders of magnitude larger than the dielectric response due to molecular fluctuations.
- You could also of couse obtain a thin ( a few mm ) sample of granite polished for 2 sides parallel and test it with a " Q-meter " fitted with a " dielectric loss adapter ".
- Thus, PCB traces have a small series resistance ( typically 0.1 ? / cm ) at DC . The high frequency component of the pulse is however attenuated by additional resistance due to the skin effect and dielectric loss tangent associated with the PCB material.
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