Microwave M4S1

The amount of power that would have to be emitted by an isotropic antenna to produce the peak power density observed in the direction of maximum antenna gain.

• Effective Isotropically Radiated Power (EIRP)

• Antenna Gain

• Isotropic Receive Level (IRL)

• Free Space Loss (FSL)

antenna efficiency (typical value = _)

• 0.55

• 0.45

• 0.65

• 0.50

If its diameter changes by a factor of 2, its gain changes by a factor of 4 = 6 dB

• True

• False

the minimum wideband carrier power (Cmin) at the input to a receiver that will provide a usable baseband output;

• Receiver Threshold (C/N)

• Received Signal Level (RSL) – unfaded

• Free Space Loss (FSL)

• Isotropic Receive Level (IRL)

Receiver Threshold (C/N) sometimes called

• Receiver Level

• Received Signal Level (RSL) – unfaded

• receiver sensitivity

• Isotropic Receive Level (IRL)

is effectively white noise and extends over a very wide spectrum. The noise power is proportional to the bandwidth.

• Receiver Level

• Received Signal Level (RSL) – unfaded

• Thermal noise

• Isotropic Receive Level (IRL)

The time variation of received signal power due to changes in transmission medium or paths

• Receiver Level

• Received Signal Level (RSL) – unfaded

• Thermal noise

• Fading

Fading depends on various factors as mentioned above. In fixed scenario, fading depends on atmospheric conditions such as rainfall, lightening etc.

• True

• False

a measure of the spectral broadening caused by the time rate of change of the mobile radio channel, and is defined as the range of frequencies over which the received Doppler spectrum is essentially non-zero

• Doppler spread

• Fading

• Attenuation

• Path Loss

Categories of Fading

• PATH LOSS

• SHADOWING

• FLAT FADING

• FREQUENCY SELECTIVE FADING

• LINE ATTENUATION