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2.32. A base station cellular communication systems lossless antenna has a maximum gain of 16 dB...
A base station cellular communication systems lossless antenna has a maximum gain of 16 dB (above...
A base station cellular communication systems lossless antenna has a maximum gain of 16 dB (above isotropic) at 1,900 MHz. Assuming the input power to the antenna is 8 watts, what is the maximum radiated power density (in watts/cm2) at a distance of 100 meters? This will determine the safe level for human exposure to electromagnetic radiation.
A 75 Ω lossless transmission line is terminated into a load 100 +j150 Ω. For this line, find: i. Reflection coefficient; ii. An antenna receiving a signal of 500 MHz has the following specificati...
A 75 Ω lossless transmission line is terminated into a load 100 +j150 Ω. For this line, find: i. Reflection coefficient; ii. An antenna receiving a signal of 500 MHz has the following specifications: input power Prad 3.25 kw; effective area of antenna Aeff 3.5 m2; total efficiency of antenna,-42%; radiation efficiency of antenna ecd-65%; tilt angle of the received signal ψ = 35°. Determine Voltage standing voltage ratio; b. i. Gain of the antenna (in dB) ii. Maximum radiation...
Question 1 The power radiated by a lossless antenna is 10 watts.
Question 1 The power radiated by a lossless antenna is 10 watts. The directional characteristics of the antenna are represented by the radiation intensity of U = 2cos3θ watts/unit solid angle. Find the (a) Maximum power density at a distance of 1000 m (assume far-field distance) (b) Maximum directivity (c) Maximum gain Question 2 In target-search ground-mapping radars it is desirable to have echo power received from a target, of constant cross section, to be independent ofits range. For one such application, the desirable radiation intensity...
Problem I Consider a digital communication downlink from a cellular tower to a cellular telephone. The...
Problem I Consider a digital communication downlink from a cellular tower to a cellular telephone. The link operates at a frequency of 900 MHz and the tower transmits at an EIRP100 Watts. The height of the tower is 35 meters and it is assumed that the height of the phone is 2 meters. The gain of the cellular phone antenna s 3 dB. Assume that the cellular phone requires a minimum receive power, P(min), of 1.5 x 109 Watts. a)...
12.38. A lossless circular aperture antenna has a gain of 15 dB and overall physical area...
12.38. A lossless circular aperture antenna has a gain of 15 dB and overall physical area of 25 cm^2. The frequency of operation is 10 GHz. (a) What is the aperture efficiency of the antenna (in %)? (b) What is the power PL delivered to a matched load given that the power density of the incident wave at the antenna aperture is 30 mW/cm^2? Assume ideal conditions (no losses).
12.38. A lossless circular aperture antenna has a gain of 15 dB and overall physical area of 25 c...
12.38. A lossless circular aperture antenna has a gain of 15 dB and overall physical area of 25 cm^2. The frequency of operation is 10 GHz. (a) What is the aperture efficiency of the antenna (in %)? (b) What is the power PL delivered to a matched load given that the power density of the incident wave at the antenna aperture is 30 mW/cm^2? Assume ideal conditions (no losses).
A gsm communication system has the following properties: R=range=2km. P=base station transmitter output power=10W. Gi=base station...
A gsm communication system has the following properties: R=range=2km. P=base station transmitter output power=10W. Gi=base station transmitter antenna gain=12dB. Gr=phone (receiver) antenna gain=3dB. f=frequency of the waves=2GHz. a-) Find the received power at the phone antenna (P.)? (15 points) b-) Find the SNR) in dB at the receiver (phone), if the noise power is N=-90dB ? Is this a "good","average", or "barely acceptable" SNR ? (10 points)
Problem #2: (40 points) Consider the following communication link. Both the transmitter and receivers are properly...
Problem #2: (40 points) Consider the following communication link. Both the transmitter and receivers are properly matched to their respective antennas. Assume that the system nominal temperature is 290 K. A detailed block diagram of the receiver is shown in the figure Determine 1. The effective isotropic radiated power in dBm. 2. The space loss in dB 3. The communication link total losses in dB 4. What would be the received power at the receiver input in dBm? 5. What's...
A base station cellular communication systems lossless antenna has a maximum gain of 16 dB (above isotropic) at 1,900 MHz. Assuming the input power to the antenna is 8 watts, what is the maximum radiated power density (in watts/cm2) at a distance of 100 meters? This will determine the safe level for human exposure to electromagnetic radiation.
A 75 Ω lossless transmission line is terminated into a load 100 +j150 Ω. For this line, find: i. Reflection coefficient; ii. An antenna receiving a signal of 500 MHz has the following specifications: input power Prad 3.25 kw; effective area of antenna Aeff 3.5 m2; total efficiency of antenna,-42%; radiation efficiency of antenna ecd-65%; tilt angle of the received signal ψ = 35°. Determine Voltage standing voltage ratio; b. i. Gain of the antenna (in dB) ii. Maximum radiation...
Problem I Consider a digital communication downlink from a cellular tower to a cellular telephone. The link operates at a frequency of 900 MHz and the tower transmits at an EIRP100 Watts. The height of the tower is 35 meters and it is assumed that the height of the phone is 2 meters. The gain of the cellular phone antenna s 3 dB. Assume that the cellular phone requires a minimum receive power, P(min), of 1.5 x 109 Watts. a)...
A gsm communication system has the following properties: R=range=2km. P=base station transmitter output power=10W. Gi=base station transmitter antenna gain=12dB. Gr=phone (receiver) antenna gain=3dB. f=frequency of the waves=2GHz. a-) Find the received power at the phone antenna (P.)? (15 points) b-) Find the SNR) in dB at the receiver (phone), if the noise power is N=-90dB ? Is this a "good","average", or "barely acceptable" SNR ? (10 points)
Problem #2: (40 points) Consider the following communication link. Both the transmitter and receivers are properly matched to their respective antennas. Assume that the system nominal temperature is 290 K. A detailed block diagram of the receiver is shown in the figure Determine 1. The effective isotropic radiated power in dBm. 2. The space loss in dB 3. The communication link total losses in dB 4. What would be the received power at the receiver input in dBm? 5. What's...
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