prelab 5 (1)

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Electrical Engineering

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Jan 9, 2024

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Pre-Lab Assignment 5 - EECS 230 1. Review shielded-loop resonators from Lab Exercise 4. 2. Read through the entire lab exercise. 3. Summarize the experimental procedures in your pre-lab write-up (1 paragraph per experiment): a. Experiment 5.1 - this experiment aims to measure how coils connected to a machine affect each other from different distances and angles. To do this, we use a special device called a network analyzer and attach coils of different sizes to it. We measure things like how well the coils are connected and how signals pass between them. This helps us understand how coils interact, which is important in designing electronic systems. b. Experiment 5.2 - This experiment aims to understand how coils behave when they're close or far apart, specifically looking at strong and weak connections between them. The procedure starts by measuring the strength of the coil connection using a specific format. Then, the distance between the coils is adjusted while keeping them aligned. The critical point where the coils transition from a single resonance to two resonances (even and odd modes) is noted. Next, the coils are brought even closer to each other to observe how the resonant frequencies change. The goal is to see if this behavior matches a specific trend shown in a figure. c. Experiment 5.3 - aims to understand and test a special part called a full-wave bridge rectifier. This component is crucial in a wireless power transfer system. The experiment focuses on checking how well the rectifier works specifically when the system uses 9 cm loops at their resonant frequency. The results show that at the resonant frequency of the 9 cm loop, the rectifier has an input return loss of -0.486 dB and an input impedance of 9.221 – j119.4 ohms. 4. Answer Questions 1 and 2 of Experiment 5.2 and Question 1 of Experiment 5.3. Questions 1. (prelab) As the resistance 𝑅 of the shielded-loop resonators increases, what happens to the critical coupling distance? a. As the resistance of the shielded loop resonators increase, the critical coupling distance will tend to decrease. (High resistance usually results in energy loss at greater distances) 2. (prelab) As resistance 𝑅 increases, what happens to the efficiency in strong coupling? a. Increased resistances will cause the efficiency of the strong coupling to decrease. Questions 1. 1. (prelab) Why must we increase the power level of the network analyzer to measure the rectifier? (Hint: What do we know about diodes?)
a. Diodes show a nonlinear behavior in their voltage current characteristics, they only allow current to flow in one direction. To measure the rectifier we increase the power level because they tend to show more nonlinear behavior at lower power levels. At high power levels the rectifiers reach the operating range of higher predictability.
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