Aperture excitation of electrically large, lossy cavities

Path loss from a personal electronic device inside an aircraft cabin to an exterior fuselage-mounted antenna

“…In the first step, we estimate the power which escapes the cabin through windows. For this, we use the method of Hill et al (1994) [1], viewing the aircraft cabin as a reverberant microwave cavity in which only four loss mechanisms are possible: (1) loss due to escape from the cavity, (2) loss due to absorption by lossy media, (3) loss due to finite wall conductivity, and (4) loss due to intercept by other antennas. We assume that the loss due to mechanisms (3) and (4) is insignificant compared to the first two mechanisms, and we further assume that transmission through windows is the dominant contribution to (1).…”

Emulation of MIMO Nonisotropic Fading Environments With Reverberation Chambers

“…The Q-factor of a cavity can be estimated from the average power transmission level by [6] ( 1) where is the volume of the cavity, is the speed of light, and is the frequency of operation. The K-factor can be calculated from the Q-factor by [3] (2) where is the directivity of the antenna under test, is the wavelength, and is distance between antennas.…”

A two-phase airframe shielding performance study using ultra-wideband measurement systems

“…More meaningful results can be obtained by smoothing the data using an averaging process. Several options are available: (1) paddle averaging using a moveable paddle that was incorporated into the box, (2) frequency-averaging over a specified bandwidth, (3) angular averaging over a number of receiving antenna locations, and (4) performing averaging using various combinations of 1, 2, and 3. All of these techniques provide effective smoothing of shielding data, but combinations of them provide a multiplicative smoothing effect.…”