An antenna circuit is connected to a 4/4 transmission line with a characteristic impedance 5052. The transmission line is terminated with an antenna having a load impedance Z=60+ j4012. The input voltage at the source is V, 100 V RMS Vy 1. Calculate the input impedance seen by the source at the antenna connection point. 2. Determine the current flowing into the antenna. 3. Verify the supplied power from the source. 4. Calculate the radiated power P 5. Find the power lost in the system

Answer all question.

a.What is the attenuation of 350 ft of RG-11 U coaxial cable at 100 MHz?b. A transmitter has an output power of 3 W that is fed to an antenna through an RG58A/U cable 20 ft long. How much power reaches the antenna?c. Two engineers have a disagreement over the selection of transmission line for connections within a 100m Data Centre on a project that is at risk for cost overrun. The first engineer is arguing in favor of using multi-mode fibre while the second engineer would like to use single mode fibre. You are the project engineer. Decide which of the two transmission lines to use and justify your answer.d. For typical silica optical fibres with ncore = 1.45 and Δ = 5 x 10-3, calculate nclad and NAe. For a typical silica fibre with D (@ λ = 1.3μm) = 2.5 nm ps/km and a semiconductor laser source centred on λ = 1.3μm with Δλ = 4nm: the bandwidth length BL ≈ 100 Gbps km (singlemode, step-index). What transmission speed is possible at a distance of 5km?f. A link from point a to point b is…

*2. If a 1500-kHz radio wave is modulated by a 2-kHz sine-wave tone, what frequencies are con- tained in the modulated wave (the actual AM signal)?

What is Carson's bandwidth formula?

The output voltage of an AM transmitter is 40 V when sinusoidally modulated to a depth of 100%. Calculate the voltage at each side frequency when the modulation depth is reduced to 50%.

The input signals into a modulator are the carrier c(t)=5 cos (2π x 10°t) and the message signal shown in Figure 2. a) If frequency modulation is performed with k = (4x) x104, find the maximum and minimum instantaneous frequencies and sketch the modulated waveform. b) If phase modulation is performed with kp = 10л, find the maximum and minimum instantaneous frequencies and sketch the modulated waveform. m(t) 1 0.1 0.2 (ms) t -1

An FM signal has a frequency deviation of 8 kHz and a modulating frequency of 1.2 kHz. The signal-to-noise ratio at the input to the receiver detector is 19.4 dB. Calculate the approximate signal-to-noise ratio (in dB) at the detector output. A sine wave of frequency 7 kHz phase modulates a carrier at 22 MHz. The peak phase deviation is 1 rad. Calculate the maximum frequency deviation in Hz. A phase modulation system operates with a modulation index of 2. What is the maximum phase shift in degrees?

A T-junction power divider is the simplest network that can be used for power division or power combining. As an engineer you need to (a) design a lossless T-junction divider for a 3:1 power split with a 30 source impedance. Sketch the diagram. (b) design quarter-wave matching transformers to transform the impedances of the output lines to 30 . (c) determine the magnitude of the scattering parameters for this circuit with a 30 characteristic impedance.