space wave

space wave

[′spās ‚wāv]
(electromagnetism)
The component of a ground wave that travels more or less directly through space from the transmitting antenna to the receiving antenna; one part of the space wave goes directly from one antenna to the other; another part is reflected off the earth between the antennas.

space wave

space waveclick for a larger image
A radio wave that follows two distinct paths from the transmitting antenna to the receiving antenna—one through the air directly to the receiving antenna, the other reflected from the ground to the receiving antenna. The primary path of the space wave is directly from the transmitting antenna to the receiving antenna. So, the receiving antenna must be located within the radio horizon of the transmitting antenna. Although space waves suffer little ground attenuation, they nevertheless are susceptible to fading. This is because space waves actually follow two paths of different lengths (direct path and ground-reflected path) to the receiving site and, therefore, may arrive in or out of phase. If these two component waves are received in phase, the result is a reinforced or stronger signal. Alternately, if they are received out of phase, they tend to cancel one another, which results in a weak or fading signal.
References in periodicals archive ?
The difference between the measured RSS and calculated RSS free space wave propagation model was used as input-output data for the system identification.
where the l is the length of aperture, a is the length of the strip line, K0 is free space wave number and Zos is the characteristic impedance of coplanar strip transmission line which could be formulated as (3)
The formulas are also excellent for far-field (plane wave) calculations, where the free space wave impedance is used.
where [DELTA]K is space wave number difference of wave spectrum sample adjacent spectral domain, and N(0, 1) represents a Gaussian random variable that the mean is 0 and the variance is 1.
Major sources of the EM coupling are the surface wave, space wave, and near- field coupling.
For many wireless applications in the 50 to 2000 MHz range, such as broadcasting, paging and mobile telephony, two components of the space wave are of primary concern: energy received by means of the direct wave, which travels a direct path from the transmitter to the receiver, and the ground-reflected wave, which arrives at the receiver after being reflected from the surface of the earth.
On the other hand, the coupling between the driven and the reflector elements and that between the first and the second elements are through space wave.
[k.sub.0z] is z-component of the free space wave vector, and f([k.sub.x], z) is the Fourier transformed solution of wave equation in the inhomogeneous layer.
Such a dipole resembles an antenna radiating an electromagnetic wave that cannot be guided by the stripline and, thus, is emitted as a surface wave or space wave.
The quasi fractional space is used in this analysis, because such a boundary was realized by Attiya [30], in which the magnetic field properties are equivalent to complementary fractional space wave equation.