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consider a 3λ/4 linear wire antenna which is fed at the center,find : i- the current distribution on the wire. ii- for the input current of .7 Amp, find the loop current (I0) , and the maximum
1- A one-meter long wire antenna is center fed by a source with frequency 30 MHz : i- find the wavelength and the current distribution along the antenna . ii- find the radiation resistance. iii- if th
Determine the distance from a parabolic reflector of diameter D=10 m to the boundary of the far-field region. The antenna is being used to transmit a 4.1 GHz signal.
What is the effective radiated power of a television broadcast station if the output of the transmitter is 1000 W, antenna transmission line loss is 50 W, and the antenna power gain is 3
If the power of a 500-kHz transmitter is increased from 150 W to 300 W, what would be the percentage change in field intensity at a given distance from the transmitter. What would be the decibel cha
The total charge accumulated by a certain device is given by as a function of timeby q=18t2-2t4 ( in SI units). What is the max charge in the interval 0<=t<=3s , and when does it occur
A 6-bit answer based on the selected Operation. The error bit is turned on if either no Operation is selected or more than one Operation is selected.
A 4-element unform linear array with interelement spacing of λ/2 is operated as a broadside array , find the beamwidth betwen nulls and the side lobe level in dB . in the above problem , it i
two λ/2 dipoles are placed parallel to each other and spaced by a distance d = .15 λ , they are fed with antiphase currents so that I2=-I1=.7 Ampere, i- find the power radiated by the
Design a 4-element broadside array with equal side lobe level of -20 dB relative to the peak value , take the inter-element spacing d=λ/2 , find the resulting beamwidth to null.
Show how to make a two-digit digital-to-analog converter by appropriately scaling the input resistors of a summing amplifier. The digital input represents two digits, each consisting of four lines t
A 3-element uniform linear array with inter-element spacing of λ/2 is operated as a broadside array ,find the directions of null radiation , find the direction and the relative level of the s
A 10 GHz radio link is established between two antennas separated by 40 Km , find the necessary height of the antennas , assume equal antenna heights and standard atmospheric conditions.
A medium wave antenna mast is 50 m high and is operating at 1 MHz with a top loading the effective height is equal to 45 meters. with input power = 100 Kw , find the input current given that the grou
A two-element array made of two λ/2 side by side dipoles with spacing equal to .125 λ , the two elements are fed by currents equal in magnitude but having a phase difference such that
Design a V antenna with arm length L=6λ at the frequency 18 MHz , namely find the V angle in degrees , find the beamwidth between nulls. if the frequency changes to 12 MHz , by how many degre
Design a linear broadside array to have nulls along the directions θ = 50°,130°, and 0° , namely find the number of elements , and the relative currents , find the beamwidth to nul
A 5-element uniform linear array with inter-element spacing of λ/2 is to have maximum radiation in the direction θ=60° , find the current phases , find the directions of null radiat
in a p+-n junction, the n side has a donor concentration of 10^16 cm^-3. if ni=10^10cm^-3, the relative dielectric constant εr = 12, dn=50cm^2/s, Dp = 20cm^2/s, and the electron and hole min
A Si p+-n junction has a donor doping of 5*10^16 cm^-3 on the n side and a cross sectional area of 10^-3 cm^2. If τ(p)= 1μs and D(p) = 10cm^2/s, calculate the current with a forward bias of .
Find the overall repeater Pe in problem 1 if the total length of the system is 600 miles and if the required repeaters that are spaced out about 50 miles per repeater. Hint: Find the total number of
A 4-element unform linear array with interelement spacing of λ/2 is operated as a broadside array , find the beamwidth betwen nulls and the side lobe level in dB . find the phasing of the ele
two λ/2 dipoles are placed parallel to each other and spaced by a distance d = .15 λ , they are fed with antiphase currents so that I2=-I1=.7 Ampere , i- find the power radiated by the
Find the Laplace transform and also find the inverse Laplace transform