Transcript Document

LAB 3
Antennas
Antenna Gain
• What factors determine antenna gain?
• Effective Area
• Wavelength
Propagation modes
Ground Wave
2. Sky-Wave Progagation
3. Line Of Sight
1.
For parabolic reflective antenna with diameter 2 meter ,operating at 12 GHz
,what is the effective area and the antenna gain ?
State which mode applied to each system
• Am Radio –
• Ground wave Propagation
• International Broadcast Such as BBC• Sky Wave Propagation
• Satellite Communication –
• Line Of Sight
• Name and briefly four types of noise ?
• How to overcome the attenuation ?
• Use Amplifiers and Repeaters
• Show that doubling the transmission frequency or doubling the distance
between transmitting antenna and receive antenna the power received by 6
dB?
• Determine the height of an antenna for TV station that must be able to reach
customers up to 80 km away
• What the thermal noise of a channel with a bandwidth of 10 KHz carrying 1000
Watt of power operating at 50 C ? Compare the noise level to the operating
power