Question:
Frequencies in the UHF range normally propagate by means of
Frequencies in the UHF range normally propagate by means of
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High-frequency electromagnetic waves such as VHF and UHF generally propagate through line-of-sight communication, known as space wave propagation.
Updated On: Jun 22, 2026
- Space waves
- Surface waves
- Ground waves
- Sky waves
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The Correct Option is A
Solution and Explanation
Step 1: Understand the UHF range.
UHF stands for Ultra High Frequency The frequency range of UHF waves is approximately \[ 300\,\text{MHz} \text{ to } 3\,\text{GHz} \] These waves have very short wavelengths.
Step 2: Study propagation characteristics of UHF waves.
UHF waves generally travel in straight lines and are not reflected effectively by the ionosphere.
Hence, they cannot propagate through sky wave propagation.
They also do not follow the curvature of the Earth efficiently, so ground wave propagation is ineffective.
Therefore, UHF communication mainly occurs through line-of-sight propagation called space wave propagation.
Step 3: Analyze the options.
(1) Space waves: Correct, because UHF waves propagate mainly through line-of-sight transmission.
(2) Surface waves: Incorrect, because surface waves are suitable for low-frequency signals.
(3) Ground waves: Incorrect, because UHF waves are strongly attenuated near the Earth's surface.
(4) Sky waves: Incorrect, because UHF waves are not reflected by the ionosphere.
Step 4: Final conclusion.
Hence, frequencies in the UHF range normally propagate by means of \[ \boxed{\text{Space waves}} \]
UHF stands for Ultra High Frequency The frequency range of UHF waves is approximately \[ 300\,\text{MHz} \text{ to } 3\,\text{GHz} \] These waves have very short wavelengths.
Step 2: Study propagation characteristics of UHF waves.
UHF waves generally travel in straight lines and are not reflected effectively by the ionosphere.
Hence, they cannot propagate through sky wave propagation.
They also do not follow the curvature of the Earth efficiently, so ground wave propagation is ineffective.
Therefore, UHF communication mainly occurs through line-of-sight propagation called space wave propagation.
Step 3: Analyze the options.
(1) Space waves: Correct, because UHF waves propagate mainly through line-of-sight transmission.
(2) Surface waves: Incorrect, because surface waves are suitable for low-frequency signals.
(3) Ground waves: Incorrect, because UHF waves are strongly attenuated near the Earth's surface.
(4) Sky waves: Incorrect, because UHF waves are not reflected by the ionosphere.
Step 4: Final conclusion.
Hence, frequencies in the UHF range normally propagate by means of \[ \boxed{\text{Space waves}} \]
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