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3 years ago

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A 20 dBm power source is connected to the input of a directional coupler having a coupling factor of 20 dB, a directivity of 35

dB, and an insertion loss of 0.5 dB. If all ports are matched, ﬁnd the output powers (in dBm) at the through, coupled, and isolated ports.

1 answer:

lukranit [14]3 years ago

6 0

Answer:

$P_O = 0.989 watt = 19.9 dBm$

Explanation:

Given data:

P_1 power = 20 dBm = 0.1 watt

coupling factor is 20dB

Directivity = 35 dB

We know that

coupling factor $= 10 log \frac{P_1}{P_f}$

solving for final power

$20 = 10 log\frac{P_1}{P_f}$

$2 = log \frac{P_1}{P_f}$

$100 = \frac{0.1}{P_f}$

$P_f = 0.001 watt = 0 dBm$

Directivity $D = 10 \frac{P_f}{P_b}$

$35 = 10 \frac{0.001}{P_b}$

$P_b = 3.162 \times 10^{-7} wattt$

output Power $= P_1 -P_f - P_b$

$= 0.1 - 0.001 - 3.162 \times 10^{-7}$

$P_O = 0.989 watt = 19.9 dBm$

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Answer:

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2 years ago

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Answer:

number of pulses produced = 162 pulses

Explanation:

give data

radius = 50 mm

encoder produces = 256 pulses per revolution

linear displacement = 200 mm

solution

first we consider here roll shaft encoder on the flat surface without any slipping

we get here now circumference that is

circumference = 2 π r .........1

circumference = 2 × π × 50

circumference = 314.16 mm

so now we get number of pulses produced

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2 years ago

If it took 2 hours to clean 4 houses how many houses could be cleaned in 3 hours

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Answer:

6 houses

Explanation:

because

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I hope this helped you sorry if I am wrong

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2 years ago

A 4-kW electric heater runs for 2 hours to raise the room temperature to the desired level. Determine the amount of electric ene

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Answer:

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Explanation:

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Therefore

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2 years ago

A sphere is assumed to have the properties of water and has an initial heat generation 46480 W/m^3 How much should the heat gene

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Answer:

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Solution:

Now, maximum heat generation, $Q_{m}$ is given by:

$T_{m} = \frac{Q_{m}r^{2}}{6K} + T$ (1)

where

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Now, using eqn (1):

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For excess heat generation, Q:

$Q = (Q_{Gi} - Q_{m})\times volume of sphere, V$

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$Q = 90.294 W$

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