TAILIEUCHUNG - Polariza

Table 1 shows the theoretical ratio of power transmitted between antennas of different polarization. These ratios are seldom fully achieved due to effects such as reflection, refraction, and other wave interactions, so some practical ratios are also included. | POLARIZATION Table 1 shows the theoretical ratio of power transmitted between antennas of different polarization. These ratios are seldom fully achieved due to effects such as reflection refraction and other wave interactions so some practical ratios are also included. Table 1. Polarization Loss for Various Antenna Combinations Transmit Antenna Polarization Receive Antenna Polarization Ratio of Power Received to Maximum Power Theoretical Practical Horn Practical Spiral Ratio in dB as Ratio Ratio in dB as Ratio Ratio in dB as Ratio Vertical Vertical 0 dB 1 N A N A Vertical Slant 45 or 135 -3 dB L N A N A Vertical Horizontal - 4 dB 0 -20 dB 1 100 N A N A Vertical Circular right-hand or left-hand -3 dB L Horizontal Horizontal 0 dB 1 N A N A Horizontal Slant 45 or 135 -3 dB L N A N A Horizontal Circular right-hand or left-hand -3 dB L Circular right-hand Circular right-hand 0 dB 1 Circular right-hand Circular left-hand - 4 dB 0 -20 dB 1 100 -10 dB 1 10 Circular rieht or left Slant 45 or 135 -3 dB L Approximately the same as theoretical Note Switching transmit and receive antenna polarization will give the same results. The polarization of an electromagnetic wave is defined as the orientation of the electric field vector. Recall that the electric field vector is perpendicular to both the direction of travel and the magnetic field vector. The polarization is described by the geometric figure traced by the electric field vector upon a stationary plane perpendicular to the direction of propagation as the wave travels through that plane. An electromagnetic wave is frequently composed of or can be broken down into two orthogonal The sum of the E field vectors determines the sense of polarization Figure 1. Polarization Coordinates components as shown in Figure 1. This may be due to the arrangement of power input leads to various points on a flat antenna or due to an interaction of active elements in an array or many other reasons. The geometric figure traced by the sum of the

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