Free Space

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Free Space </dt>
An ideal, perfectly homogeneous medium possessing a dielectric constant of unity and in which there is nothing to reflect, refract or absorb energy. A perfect vacuum possesses these qualities. Compare homogeneous atmosphere. </dd>
''Radio signal strength measurements are often expressed in terms of decibels above or below free-space values at a given distance from the transmitter. A free-space radiation pattern would show only the minor and major lobes of the antenna and not the interference pattern normally produced by reflection from the earth's surface. [[/a>|/a> ]]</dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use