An antenna transmitts 1 MWatt radiated power at a frequency of 600MHz.. If the the frequency is increased to 900 Mhz, Ho...
An antenna transmitts 1 MWatt radiated power at a frequency of 600MHz.. If the the frequency is increased to 900 Mhz, How much power will be radiated. (amplitude is same)
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An antenna transmitts 1 MWatt radiated power at a frequency of 600MHz.. If the the frequency is increased to 900 Mhz, Ho...
Use Hata model, assuming that carrier frequency is 900 MHz, mobile antenna height is 1.5 m,...
Use Hata model, assuming that carrier frequency is 900 MHz, mobile antenna height is 1.5 m, and base station antenna height is 30 meter, determine the required transmit power level to obtain a 5 km cell radius when the receiver sensitivity is −104 dBm
2. In the circuit shown below, the operating frequency for the transmit antenna is 300 MHz....
2. In the circuit shown below, the operating frequency for the transmit antenna is 300 MHz. At this frequency, we can represent the transmission line and antenna with a resistive load RL. This resistance accounts for radiated electromagnetic wave. The variable capacitor and inductor shown were tuned to achieve an impedance matching condition, i.e. where ZL is the impedance of the transmission line-antenna assembly and Zr is the Thévenin equivalent impedance of the driver circuit, including R., C and L....
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...
You have an antenna with an input impedance of Z (140 -j35)2 at f 120 MHz....
You have an antenna with an input impedance of Z (140 -j35)2 at f 120 MHz. You would like to match this load to a 70Ω transmission line using a single stub tuner (vp-2.2x108 m/s). Using the Smith chart, determine the distance d away from the load and the length l of a short-circuited parallel stub to accomplish the matching goal at the design frequency. Estimate the reduction in radiated power if the operating frequency is changed to f 125...
Please show all steps 2.60. A 1-m long dipole antenna is driven by a 150 MHz...
Please show all steps
2.60. A 1-m long dipole antenna is driven by a 150 MHz source having a source resistance of 50 ohms and a voltage of 100 V. If the ohmic resistance of the antennas is given by RL 0.625 ohms, find the: (a) Current going into the antenna (/ant) (b) Power dissipated by the antenna (c) Power radiated by the antenna (d) Radiation efficiency of the antenna
A radio antenna broadcasts a 1.0 MHz radio wave with 25 kW power. Assume the radiation...
A radio antenna broadcasts a 1.0 MHz radio wave with 25 kW power. Assume the radiation is emitted uniformly in all directions. 1) what is the wave's intensity 30 km from the antenna 2) what is the electric field amplitude at this distance?
The FCC typically regulates the maximum effective radiated power from an antenna (ERP or EIRP) be...
The FCC typically regulates the maximum effective radiated power from an antenna (ERP or EIRP) because of the potential for interference to other services. This restricts not just the maximum transmitter power, but also the maximum antenna gain. With microwave and millimeter wave systems, they also sometimes regulate the minimum antenna gain. Why might this be so? (Hint: what is the source of gain in an antenna which has no active elements?)
The FCC typically regulates the maximum effective radiated...
11.12 The amplitude of the electric field intensity of a half-wave dipole antenna at r 5 km and /6rad is 0.01 V/m in free space. If the operating frequency is 30 MHz, determine its length and the tot...
11.12 The amplitude of the electric field intensity of a half-wave dipole antenna at r 5 km and /6rad is 0.01 V/m in free space. If the operating frequency is 30 MHz, determine its length and the total power that it radiates. Alse, write express
11.12 The amplitude of the electric field intensity of a half-wave dipole antenna at r 5 km and /6rad is 0.01 V/m in free space. If the operating frequency is 30 MHz, determine its length...
MHz. The dipole is made of copper wire with a radius of 1 mm (a) Determine the radiation efficiency of the antenna; (b)...
MHz. The dipole is made of copper wire with a radius of 1 mm (a) Determine the radiation efficiency of the antenna; (b) What is the antenna gain in decibels? (c) What antenna current is required so that the antenna will radiate 80 W, and how much power will the generator have to supply to the antenna?
MHz. The dipole is made of copper wire with a radius of 1 mm (a) Determine the radiation efficiency of the antenna; (b)...
9. (6 points) An antenna engineer is asked to design a X/2 dipole antenna to operate at 450 MHz. (a) Calculate the leng...
9. (6 points) An antenna engineer is asked to design a X/2 dipole antenna to operate at 450 MHz. (a) Calculate the length of the antenna if it is located in free space. (b) Calculate the magnetic field intensity, H, at a distance of 400km, polar position 0 = 30 degrees and current I = 2A (c) What value of the current I is needed for the total radiated power to equal 100 mW. (d) Determine the length of the...
2. In the circuit shown below, the operating frequency for the transmit antenna is 300 MHz. At this frequency, we can represent the transmission line and antenna with a resistive load RL. This resistance accounts for radiated electromagnetic wave. The variable capacitor and inductor shown were tuned to achieve an impedance matching condition, i.e. where ZL is the impedance of the transmission line-antenna assembly and Zr is the Thévenin equivalent impedance of the driver circuit, including R., C and L....
You have an antenna with an input impedance of Z (140 -j35)2 at f 120 MHz. You would like to match this load to a 70Ω transmission line using a single stub tuner (vp-2.2x108 m/s). Using the Smith chart, determine the distance d away from the load and the length l of a short-circuited parallel stub to accomplish the matching goal at the design frequency. Estimate the reduction in radiated power if the operating frequency is changed to f 125...
Please show all steps
2.60. A 1-m long dipole antenna is driven by a 150 MHz source having a source resistance of 50 ohms and a voltage of 100 V. If the ohmic resistance of the antennas is given by RL 0.625 ohms, find the: (a) Current going into the antenna (/ant) (b) Power dissipated by the antenna (c) Power radiated by the antenna (d) Radiation efficiency of the antenna
The FCC typically regulates the maximum effective radiated power from an antenna (ERP or EIRP) because of the potential for interference to other services. This restricts not just the maximum transmitter power, but also the maximum antenna gain. With microwave and millimeter wave systems, they also sometimes regulate the minimum antenna gain. Why might this be so? (Hint: what is the source of gain in an antenna which has no active elements?)
The FCC typically regulates the maximum effective radiated...
11.12 The amplitude of the electric field intensity of a half-wave dipole antenna at r 5 km and /6rad is 0.01 V/m in free space. If the operating frequency is 30 MHz, determine its length and the total power that it radiates. Alse, write express
11.12 The amplitude of the electric field intensity of a half-wave dipole antenna at r 5 km and /6rad is 0.01 V/m in free space. If the operating frequency is 30 MHz, determine its length...
MHz. The dipole is made of copper wire with a radius of 1 mm (a) Determine the radiation efficiency of the antenna; (b) What is the antenna gain in decibels? (c) What antenna current is required so that the antenna will radiate 80 W, and how much power will the generator have to supply to the antenna?
MHz. The dipole is made of copper wire with a radius of 1 mm (a) Determine the radiation efficiency of the antenna; (b)...
9. (6 points) An antenna engineer is asked to design a X/2 dipole antenna to operate at 450 MHz. (a) Calculate the length of the antenna if it is located in free space. (b) Calculate the magnetic field intensity, H, at a distance of 400km, polar position 0 = 30 degrees and current I = 2A (c) What value of the current I is needed for the total radiated power to equal 100 mW. (d) Determine the length of the...
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