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# The Fundamentals of Radio Wave Propagation

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Introduction

The Fundamentals of Radio Wave Propagation

How do radio waves get from one location to another? Why does a signal at generated at Point A, which is several thousand miles away, reach Point B without a complicated myriad of connecting wires? The answer, in three words, is radio wave propagation. Radio wave propagation theory is of particular importance to wireless

Middle

Frequency Name

Frequency Range

Wavelength

Low Frequency

10-300 kHz

30-1 km

Medium Frequency (mf)

300-3000kHz

1000-100m

High Frequency (hf)

3-30 MHz

100-10m

Conclusion

3-30GHz

10-1cm

Extremely High Frequency (EHF)

30-300GHz

10-1mm

FIGURE 1

Radio waves travel at approximately the speed of light.  In free space, they also travel in straight lines, thus, in order for them to be transmitted from the origin to the destination, both the transmitter and the receiver must be in the other’s line of sight or the signal must arrive through some sort of reflected path.

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