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FDFD method in 2D. Repeat Problem 9.9, the system of scatterers with a PML boundary, in the FDFD method using the wave equation for z. Derive the simulation with a sinusoidal source with a wavelength of 0.5 m. Measure the field distribution throughout the space; evaluate the reciprocity of the simulation by alternating points A and B as source and receiver.
Problem 9.9
Problem 7.9
Horn antenna. Modify your 2D TE simulation code to excite a horn antenna, as illustrated in Figure 7.8c. Excite the antenna with an y source at the left end of the antenna, with a given voltage across the antenna plates (note that this 2D horn is really the opening of a 2D waveguide).
(a) Measure the antenna radiation pattern some distance from the antenna at a range of frequencies. (You can do this either by exciting a Gaussian pulse, or by running the simulation multiple times with a sinusoidal source at different frequencies.) Vary the length l2 and the angle θ of the horn antenna and compare the results.
(b) Measure the characteristic driving-point impedance of this horn / waveguide combination, and compare to the impedance of the waveguide alone in the previous problem. Comment on the effect of the horn in this context. You will need to take special care when handling the boundary conditions on the angled section of the horn, since the "normal" and "tangential" fields are no longer along grid edges; this will result in a stair-stepped horn aperture.
It is proposed to apply 'disturbance feedback control, to the system by the inclusion of a transducer that measures the external temperature and feeds a signal back to the input via a proportional controller of gain H. Determine the required value..
Consider a portable 20cm2 fuel cell operating at 0.75V, 0.6 A/cm2. Suppose the stoichiometry of the anode is 2.0 and that of the cathode is 2.3. The fuel cell is expected to run for 3 days before being recharged.
Sketch an AND circuit using bipolar junction transistors. Briefly explain how input combinations produce the desired output. Sketch and XOR circuit using transistors. Briefly explain how input combinations produce the desired output.
Suppose host A and the DHCP server are separated by 2 kilometers and are connected by a direct link of R = 2 Mbps. Suppose the propagation speed over the link is 2.5×108 meters/sec. Neglecting the processing and queuing delays and assuming each pa..
In actual electronic work, capacitances range from 30 picofarads, to 60 microfarads, to 5 farads. Assuming that each of these capacitances is charged to five volts, find for each a) the stored charge in coulombs, b) the number of electrons stored ..
Assume that the initial energy stored in the inductors shown in the circuit is zero. Find the equivalent inductance with respect to terminals a and b
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The Integrator and Differentiator appear to behave like analog filters. What kind of filters are they, how do they behave with low and high frequencies
A single phase a.c. generator supplies the following loads :- Calculate the total kW and kVA delivered by the generator and the power factor at which it works.
As current passes through the wires, the wires heat up, thus toasting the toast. Estimate the overall resistance of a heating element which is 220 cm long and consists of nichrome wire with a diameter of 0.56 mm.
Modulating Radio Frequency Carriers to Carry Digital Data, Digital radio transmission requires the use of a carrier wave which is modulated by the digital data.
A uniform plane wave propagating in a medium and find α, β, and H→
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