Sergey N. Makarov - Antenna and EM Modeling with MATLAB Antenna Toolbox

11 11*. Browsing the Antenna Toolbox Classes, provide at least one example of an antenna that has a significantly larger bandwidth than a thin dipole of the same length when matched to a 50 Ω generator/transmission line. Justify your answer by numerical simulations.

12 12*. A quantity that is also often used in analyzing the port characteristics of an antenna is return loss. What is it? How is it different from the reflection coefficient? Use the MATLAB Antenna Toolbox to plot the return loss and the reflection coefficient of a dipole antenna as described in Problem 10. Comment on the results.

13 13*. Your boss at the startup you have joined tells you about this new antenna that has been designed and called an ESD – an electrically small dipole. Your boss claims that the spatial radiation characteristics (far‐field directivity/gain) do not change as the operating frequency is lowered. Investigate this claim by using the dipole in the MATLAB Antenna Toolbox library, modifying it as per the dimensions in Problem 10 and analyzing at the following frequencies: 200, 150, and 100 MHz. Do the following:Calculate and plot the 3D radiation pattern of the antenna at the listed frequencies and make a table of the maximum directivity reported in the plot (look at top‐left corner).Tabulate the impedance of this antenna at the listed frequencies.Comment on the results.

14 14. Is the common household microwave oven an antenna? Justify your answer.

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