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What is the relative permittivity of gold at radio-frequencies or specifically around 15-20MHz?
Relative permittivity, also known as dielectric constant, is a measure of a material's ability to store electrical energy in an electric field. It is the ratio of the electric flux density produced in a material to the electric flux density produced in a vacuum under the same conditions.
The relative permittivity of a material is an important factor in determining its behavior in an electric field, particularly at high frequencies. In the case of gold, it is known for its low loss and high conductivity, making it a desirable material for use in high frequency applications such as radio communication.
The relative permittivity of gold at radio-frequencies is relatively high compared to other metals and most non-metallic materials. It is approximately 6.9 at a frequency of 1 MHz, while materials like aluminum and copper have values closer to 1. This means that gold can store more electrical energy in an electric field compared to these other materials.
Yes, the relative permittivity of gold is frequency-dependent. This means that its value will vary at different frequencies. In general, the relative permittivity of gold decreases as the frequency increases. This is due to the fact that at higher frequencies, the electrons in gold are not able to respond as quickly to the changing electric field, resulting in a lower permittivity.
The relative permittivity of gold at radio-frequencies can be measured using a variety of techniques, such as impedance spectroscopy or cavity perturbation methods. These methods involve measuring the response of the material to an applied electric field at different frequencies and using this data to calculate the relative permittivity. Care must be taken to ensure that the measurements are accurate and reliable.