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1- 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 radiation , hence sketch the radiation pattern , find also the relative side lobe level .
2- 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 nulls and the side lobe level .
3- 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 degrees will the peak radiation direction rotate ?
A base stationcellular communicationsystems 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/cm^2)
A 20-m3 tank contains nitrogen at 23 C and 600 kPa. Some nitrogen is allowed to escape until the pressure drops to 400 kPa and the temperature to 20 C. Determine the amount of nitrogen gas that has escaped in kg. How much in this in Kmoles
A 5.88-g bullet is moving horizontally with a velocity of +340 m/s, where the sign + indicates that it is moving to the right (see part a of the drawing). The bullet is approaching two blocks resting on a horizontal frictionless surface.
An infinitely long wire is placed in a space with relative permeability of 9000 carrying current of 1.9 A in the +y direction. What is the magnitude of the magnetic flux density at (0.03,0,0) [meters] in units of Tesla
What is the net number of electrons per second that pass through the cross-section of a wire carrying 5 A of dc current The current now is due to electrons, and the magnitude of the charge of each electron is 1.60×10?19 C.
Explain the function of the HMI in a SCADA system.
Briefly explain your ideal job as electrical engineer? Why did you select this career? What goals do you have in this career? How do you plan to get these goals?
Write a script that numerically calculates the slopes for the function y = ex. Use x-values that range from 0 to 10 in increments of 0.1. Using these slopes, calculate the equation of a line that is tangent to the function at x = 8.3.
3. For a simulated inductor application, to yield L = 75mH, R1 = 3kohm, and C1 = 200uF, determine required value of R2 4. For a constant current generator, with a saturation voltage = 20V and a current reference of 30mA, calculate RLmin.
What observations can be made about a physical system that has both pole and zero locations that are not real-valued or complex conjugate pairs.
An open-circuited 50 Ohm microstrip transmission line is used in a microwave amplifier circuit to provide a capacitance of 3.2 pF at 2.3 GHz. (a) Find the appropriate electrical length of the line and (b) Find the lumped element values of the open..
For an armature-control DC motor the following parameters are given: ea=22V, f=5x10^-3 onz-in/rad/sec, J=4.27X10^-4 in-onz-sec^2, La=0, Ts=10 onz-in (stall torque), wo= 480 rad/sec (no load speed), K=7.66 in-onz/amp.
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