# microwave devices homework help

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• Q1:14. Plot the following impedance points on smith chart. i. Z1= 100+j50 ii. Z2 = 75-j100 iii. Z3 = j200 iv. Z4 = 150See Answer
• Q2:In the given figure 2, simulated and measured S11 plots of an antenna designed are given. i. Simulated without defected ground structure (DGS), ii. simulated with DGS, iii. Measured with DGS. State the impedance bandwidth of these three S11 plots and the points where resonances occur in each plot. 13. \$11 (dB) -10 -20 -30 -40 24 26 28 Simulated without DGS Simulated with DGS -Measured with DGS 30 32 Frequency (GHz) Figure2: S11 vs. frequency plot of the antenna. 34 36 38 40See Answer
• Q3:In the figure 1 given below, determine the frequency range where the antenna efficiency is above 80%. And state the frequency where antenna gain isSee Answer
• Q4:14. Plot the following impedance points on smith chart. i. Z1= 100+j50 ii. Z2 = 75-j100 iii. Z3 = j200 iv. Z4 = 150See Answer
• Q5:15. Plot the following on smith chart i. Z5 = infinity (Open circuit) ii. Z6 = 0 (short circuit) iii. Z7 = 50 (Z.) iv. Z8 = 184-j900See Answer
• Q6:EXPERIMENT 5 • Measurement of Impedance (Use component #507 - termination - as an additional load): Please do the following: 1. Record all your work in your individual lab notebook in an orderly fashion. 2. Write a group formal report in which all group/team members participate fully. Use the formal lab report format provided! Your report must address all the questions, objectives, etc. in the handout. Please DO NOT forget RESULTS and CONCLUSIONS!See Answer
• Q7:9 A linearly polarised plane electromagnetic wave of wavelength 450 nm is incident normally on the surface of a metal with electrical conductivity 1.69x 10² (Ohm m)-¹. a) Find the skin depth of the wave when it is inside the metal. 10 b) Find the phase speed of the wave when it is in this metal. [5] [5] c) Find how much energy of the incident wave in terms of percentage has been lost in the metal. Can the metal be used to make a good mirror? d) If the angle of incidence is 45°, find the angle of refraction. [5] [5] a) What is a Tee junction? Write down the types of the Tee junction based on the construction. [5] b) What is a Magic Tee? Explain the function of ports and different cases of signals entering and exiting at the ports of the Magic Tee. [5] c) What is the use of a radio-frequency (RF) Filter? Write down types of the RF filter based on the frequency of operation. [5] d) Draw and briefly describe the curves of Low-pass and High-pass filters. [5]See Answer
• Q8:1. If a signal has a gain (G) equals to 32000 (linear), what is the gain in dB? How much will be the remaining power (in %), if the gain is reduced to 6dB.See Answer
• Q9:3. How much is the power of 2.5 x 10-³ W in dBm?See Answer
• Q10:4. An amplifier has an input power of 0.5 watts and its output power of 75 watts. What is the gain of the amplifier in dB?See Answer
• Q11:5. Calculate the length of a quarter-wave transmission line where frequency is 1800 MHz.See Answer
• Q12:6. Find the characteristic impedance Zo of the lossless transmission line whose unit length of inductance L = 10 mH and unit length of capacitance C = 200 μF.See Answer
• Q13:7. Calculate the gain of the antenna (in dB) if the radiation resistance of the antenna is 52 £2, and loss resistance is 12 2. The antenna directivity is 18 (linear).See Answer
• Q14:8. Calculate the radiation resistance when the loss resistance of an antenna is 82, the directivity of the antenna is 20 (linear) and power gain is 18 (linear).See Answer
• Q15:9. If the reflection coefficient (r) is 0.5, calculate the VSWR.See Answer
• Q16:10. Calculate the reflection coefficient || when the antenna load impedance is Z₁ = (30 + j 40), and characteristic impedance is Z. = 50 Ω.See Answer
• Q17:11. Calculate the reflection coefficient when the VSWR= 1.5. Also calculate the corresponding return loss in dB.See Answer
• Q18:In the figure 1 given below,determine the frequency rangewhere the antenna efficiency is above 80%.And state the frequencywhere antenna gain is maximum in the plot.一-.E重k起成y70如2241o9达yGlu)Figurel:Gain and efficiency vs.frequency plot.See Answer
• Q19:In the figure 2, simulated and measured S11 plots of an antenna designed are given. 1. SimulatedSee Answer
• Q20:14. Plot the following impedance points on smith chart. i. Z1= 100+j50 ii. Z2 = 75-j100 iii. Z3 = j200 iv. Z4 = 150See Answer

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