Further Observations of the Angle of Arrival of Microwaves

Holographic reconstruction of source distributions from microwave height-gain curves

“…The well-known Mie theory is the basis for models of raininduced attenuation. If drop-size distribution [2], [3] and fall speed of drops [4], [5] are taken into account, the theoretical relation between rain intensity and attenuation may be derived for spherical drops. The agreement with experiments is satisfactory.…”

“…This is easily seen from (4), where the numerator is constant for a given path length and wavelength; the denominator remains constant when Ah decreases and N increases simultaneously, because the aperture ( H = AhN) is unchanged. However, with a smaller Ah, the range X on the object plane will increase (see (4)).…”

Experimental probing of multipath microwave channels

“…Again the pioneering experiments are due to Bell Laboratories from 1944 to 1949 [Sharpless, 1946;Crawford and Sharpless, 1946;Crawford and Jakes, 1952]. In these experiments, directional antennas were mechanically moved to scan sinusoidally a 2 ø angular arc in 20 s. The angular resolution obtained was of about 0.1 ø.…”

Radio Propagation Fundamentals*

“…These factors are discussed more completely in Section IV. However, the important point to note in this section is that considerable simplification is possible in most practical cases, and that the variations with polarization and ground constants (4) (5) and the confusion about the surface wave can often be neglected. For near grazing paths, R is approximately equal to -1 and the factor it can be neglected as long as both antennas are elevated more than a wavelength above the ground (01' more than 5-10 wavelengths above sea water).…”