27. A 50 N transmission line is terminated in a load that results in a reflection coefficient of 0.5+0.5. (a) What is the load impedance? (b) What is the VSWR on the line? (c) What is the input impedance if the line is one-half wavelength long?
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- Due to line mismatch, a voltage standing wave ratio of 10 is calculated. The total volatge at the load is 5Vrms. What is the peak amplitude of the incident voltage at the load? Assume that the incident and reflected voltages are in phase at the point of reflection.Simplified or ideal equivalent circuit representation of transmission line at RF consists of: a. R and C b. R, L, C and G c. Rand G d. Land C Characteristic impedance at RF frequencies is purely: a. conductive b. resistive c. inductive d. capacitive Radiation loss of a transmission line: a. independent of frequency b. increases with frequency c. decreases with frequency d. increases at some frequency range and then decreases with frequencyWhat is the value of the input impedance half wavelength from the load? a. ZL b. minimum c. maximum d. Zo For an open circuit line, the location of the first maximum current is ____. a. at the load b. λ/4 from the load c. 0.125λ from the load d. λ/2 from the load What is the phase difference between two points that are half wavelength apart? a. 90° b. 45° c. 180° d. 270°
- A 702 high-frequency lossless line is used at a frequency where 2 = 80cm with a load of 140+j91 2 a. Calculate the reflection coefficient and the SWR b. Determine the distance to the first voltage minimum from the load c. Determine the distance to the first voltage maximum from the load d. Calculate the impedance at the point where maximum voltages occurA coaxial cable is 10 meters long, and is filled with lossless Teflon, having a relative permittivity of 2.1. There is a matched load at the end of the line (this means that there is no reflection at the end, so there is only a signal traveling in the + z direction). At the input of the line, a sawtooth waveform is applied, having a peak voltage of 1.0 [V] and a duration of 1.0 [ns] (the time from the beginning of the waveform until the end). Make a plot (versus time) of what an oscilloscope would read if it were connected to the line at various locations, corresponding to the following values of z: 0.0 [m], 1.0 [m], 5 [m], 10 [m]. Plot out to 50 [ns] 1A transmission line is not properly terminated thereby causing a a reflection coefficient magnitude of 0.5 where the reflected current is in phase with the incident current at the point of reflection. What is the impedance of the termination if the characteristic impedance of the line is 50 ohms?
- 1. On a lossless 500 coaxial transmission line with a shorted load: a. a voltage minimum will occur at the load. b. a current maximum will occur at the load. c. a voltage maximum will occur A/4 back from the load. d. the voltage and current are in phase. e. the voltage and current are 90⁰ out of phase. f. the standing wave moves toward the source.A system has a forward power of 60 W, reflected power of 3 W, and transmission line loss of –3 dB. What will be the observed loss on the ground? A system has a forward power of 200 W and a reflected power of 15 W, what is the return loss?A loss-less transmission line with characteristics impedance of 600 ohms is terminated in a purely resistive load of 900 ohms. The reflection coefficient is?
- Voltage reflection coefficient can be defined as: a) ratio of amplitude of reflected voltage wave to the transmitted voltage wave b) ratio of amplitude of reflected voltage to the incident voltage wave c) ratio of load impedance to the characteristic impedance of the transmission line d) none of the mentioneda line characteristic impedance 600 ohm and 3 db loss is a half wavelength .it is fed by a source of emf 5v and impedance 1 kilo ohm and is terminated by aload 0f 400 ohms impedance .calculate the load voltage ..Define the return loss of a microwave circuit in terms of the reflection coefficient and the voltage standing wave ratio VSWR. If the load impedance Z₁= 128.8 and the line impedance Zo=100 2, calculate: A. The reflection coefficient I B.The voltage standing wave ratio VSWR.