radiation resistance


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radiation resistance

A ficticious resistance in which the power radiated away from or collected by an antenna is considered to be dissipated. For a perfect antenna made of superconducting material, the ohmic losses (power dissipation arising from resistance) in the elements themselves are zero; the resistive part of the impedance presented at the feed point is then equal to the radiation resistance. In any practical antenna the ohmic losses are kept as small as possible in comparison to the radiated power. Maximum power transfer between transmitter or receiver and the antenna is effected when the feeder has a characteristic impedance equal to the radiation resistance.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

radiation resistance

[‚rād·ē′ā·shən ri‚zis·təns]
(acoustics)
For a medium, the acoustic impedance of a plane wave in that medium. Also known as radiation impedance.
(electromagnetism)
The total radiated power of an antenna divided by the square of the effective antenna current measured at the point where power is supplied to the antenna.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Thus, although the fluorinated methacrylate polymers exhibit optical properties that appear more radiation resistant than PMMA, they do not exhibit any superior radiation resistance with regard to the production of low molecular weight compounds.
When the T-shaped feedline is used, the bandwidth is extended proportionately to the slot width and the radiation resistance has a low value.
Then, the resonant frequency and radiation resistance are obtained from resonant curve of the surface current and equivalent capacitance of the patch.
* phenyl methyl vinyl silicone rubber (low temperature, heat and radiation resistance);
Insoluble to most industrial chemicals, they demonstrate high levels of chemical, electrical, and radiation resistance. Typical applications include PIP rings, back-up rings.
Choose materials from those that are most resistant to radiation, as illustrated in the chart of relative radiation resistance shown in the Table.
The Kynar resin-based foams are said to exhibit excellent chemical resistance, stability at high temperatures, extremely low smoke and flame characteristics, water repellency, good UV resistance and weatherability, excellent mechanical properties, radiation resistance and low ionic extractability (high purity), according to the manufacturer.
Further enhancements are available that increase radiation resistance and resistance to fuels and solvents.
Users simply mix the resin and hardener and cure at 250 [degrees] F for high electrical resistance, low-moisture absorption, high-temperature stability, high-bond strength, low shrinkage and excellent chemical, solvent, and radiation resistance.
This level of conversion is said to result in optimal mechanical properties, high radiation resistance, low moisture absorption, and low outgassing while retaining high toughness, low (244 F) stress-free temperature, and long out time.

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