A half-wave dipole (antenna efficiency= 80%) is driven by an input current of 0.5A (RMS). Determine the maximum radiation power density and the corresponding electric field strength at a point 200 m away from antenna.
A half-wave dipole (antenna efficiency= 80%) is driven by an input current of 0.5A (RMS). Determine...
Calculate the maximum power density 1 km away from a half-wave dipole antenna that is radiating 100 milliwatts. Repeat the calculation for a dipole antenna that is much shorter than a wavelength. (The gain of a half-wave dipole antenna is 2.15 dBi.)
5.8 : Calculate the antenna calibration factor for a half-wave dipole designed to operate at 1 GHz. When this antenna is connected to a cable having 0.5 dB loss, the power available at the receiver input terminals is −10 dBm. Under these conditions, what is the measured electric field strength in dBV/m?
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)...
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...
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
An array antenna consists of two identical half-wave dipole antenna elements. The array operates in air at 100 MHz. User A is in the azimuth plane of the array, on a line that makes 60° with the line defined by the antenna elements. The driving current has no phase shift. What is the shortest physical distance, d, between the antenna elements in the array that will ensure maximum signal strength in the direction of the user? I lew 600 d
A dipole antenna, with a triangular current distribution, is used for communication with sub- marines at a frequency of 150 kHz. The overall length of the dipole is 200 m, and its radius is I m. Assume a loss resistance of 2 ohms in of the antenna including the loss resistance. The input reac- tance can be approximated by tan(xl/l) (b) Evaluate the radiation efficiency of the antenna. c) Evaluate the radiation power factor of the antenna. (d) Design a...
Problem 5 The configuration shown below depicts two vertically oriented half-wave dipole antennas pointed towards each other, with both positioned on 100-m-tall towers separated by a distance of 5 km. If the transmit antenna is driven by a 50-MHz current with amplitude Io 2 A, determine: Reflecied 100m (a) The power received by the receive antenna in the absence of the surface. (Assume both antennas to be lossless.) (b) The power received by the receive antenna after incorporating reflection by...
1) A Hertzian dipole antenna is a short conducting wire carrying an approximately constant current over its length If such a dipole is placed along the z-axis with its midpoint at the origin, and if the current flowing through it is i(t) ż lo cosot, assume I to be sufficiently small so that the observation point is approximately equidistant to all points on the dipole; that is, assume RR then the corresponding magnetic field is described by: olk2 sin e...
Please show step to answer problem below A half-wave dipole is radiating into free-space. The coordinate system is defined so that the origin is a the center of the dipole and the z-axis is aligned with the dipole input power to the dipoles 92 w. Assuming an overall efficiency of 40%, find the power density (in W/m2 at r 507 m, = 61, ? =0