Question
Download Solution PDFWhat should be the length of transmitting Antenna for radiating radio waves of 900 MHz
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
- For transmitting a signal, we need an antenna or an aerial.
- This antenna should have a size comparable to the wavelength of the signal (at least 1/4 in dimension) so that the antenna properly senses the time variation of the signal.
- For example, if we have an electromagnetic wave of frequency (f) 20 kHz, the wavelength (λ) is 15 km
Calculation:
Given that,
Radio waves of frequency 900 MHz are transmitted, i.e.,
f = 900 × 106 Hz
Hence the minimum length of the antenna is given as:
Here c is the velocity of light, λ is wavelength and f are frequency of the wave
∴
L = 8.3 cm
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