Practical_Antenna_Handbook_0071639586
C h a p t e r 2 : r a d i o - W a v e P r o p a g a t i o n 43 TX RX A B Figure 2.23 Multihop interference. specific frequencies. Selecting a system frequency within any of these ranges will cause poor communications or will require a combination of more transmit power, better receiver sensitivity, and better antennas at both receiving and transmitting locations. Further, the curves of Fig. 2.25 are based on certain assumed standard conditions. Rain and other forms of airborne precipitation can severely increase the attenuation of signals beyond the amounts shown in the chart. Upper Duct Boundary TX RX Lower Duct Boundary Figure 2.24 Duct focusing.
44 p a r t I I : F u n d a m e n t a l s 40 30 H 2 O 20 10 63 GHz peak O 2 1 Attenuation (dB/km) 0.1 0.03 H 2 O 22 GHz peak O 2 0.02 0.01 0.005 0.004 0.003 O 2 0.002 H 2 O 0.001 1 2 3 4 5 10 20 30 40 50 100 200 300 Frequency (GHz) Figure 2.25 Atmospheric absorption of radio signals at microwave frequencies.
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C h a p t e r 2 : r a d i o - W a v e P r o p a g a t i o n 43<br />
TX<br />
RX<br />
A<br />
B<br />
Figure 2.23 Multihop interference.<br />
specific frequencies. Selecting a system frequency within any of these ranges will cause<br />
poor communications or will require a combination of more transmit power, better receiver<br />
sensitivity, and better antennas at both receiving and transmitting locations. Further,<br />
the curves of Fig. 2.25 are based on certain assumed standard conditions. Rain and<br />
other forms of airborne precipitation can severely increase the attenuation of signals<br />
beyond the amounts shown in the chart.<br />
Upper Duct Boundary<br />
TX<br />
RX<br />
Lower Duct Boundary<br />
Figure 2.24 Duct focusing.
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