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30 p a r t I I : F u n d a m e n t a l s<br />

Figure 2.12A Power in a free-space field (normalized to 1 W).<br />

where n = signal loss coefficient<br />

S r = signal level at receiver in presence of ground reflection component<br />

S f = free-space signal strength over path D 1 if no reflection takes place<br />

You can calculate n as follows:<br />

or<br />

⎛ h h ⎞<br />

n = 4 sin ⎜<br />

2π 2 2 t r<br />

⎟<br />

⎝ λD<br />

⎠<br />

1<br />

(2.14)<br />

⎛ 2πh ⎞<br />

thr<br />

n = 2sin⎜<br />

⎟<br />

⎝ λD<br />

⎠<br />

1<br />

(2.15)

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