Asked Jan 25, 2020

Establish the relation between dB and dBm while measuring the power of an antenna.


Expert Answer

1 Rating
Step 1

The dBm is a logarithmic unit of power and it stands for power in decibels when the reference power is one milliwatt. If PT is the power transmitted by an antenna in watts (W), then the power transmitted by the antenna in dBm can be obtained using the following relation:

The dB is a logarithmic unit of power and it stands for decibels. If PT is the power transmitted by an antenna in watts (W), then the power transmitted by the antenna in dB can be obtained using the following relation:


Step 2

Now, if P is the amount of power to be converted into dBm or dB, then using equation (1) and (2), the following relation can be written:

The meaning of equation (3) is that if the power in a certain experiment is given as 6 dBm, the value of the corresponding power in dB will be 6-30=-24 dB.


Want to see the full answer?

See Solution

Check out a sample Q&A here.

Want to see this answer and more?

Solutions are written by subject experts who are available 24/7. Questions are typically answered within 1 hour.*

See Solution
*Response times may vary by subject and question.
Tagged in


Electrical Engineering

Related Electrical Engineering Q&A

Find answers to questions asked by student like you
Show more Q&A

Q: 5) Drive the state table and the state diagram of the sequential circuit shown below: Т A A' Clk -В ...

A: For T­-flipflop, whenever the input is high, it toggles and if the low input is provided, flip-flop ...


Q: Sketch the Root Locus for the following loop transfer functions when 0 < K <0o. 4) к a) L(s) = G.(s)...

A: (a)


Q: In the single-node-pair circuit below I1 = 6 A, 12 = 3 A, R1 = 5.5 N, R2 = 16 N, R3 = 9 N, R4 = 12.5...

A: Redrawing the circuit by marking the node V as shown below:


Q: Two complex numbers E and F are given as E=20&lt;45° F=5&lt;135°. Express the complex number E/F in...

A: As given that complex value of E and F is 


Q: MATLAB code with output- Refer Book Electromagnetic theory by Mathew. N.O. Sadiku-7th edition - Chap...

A: In this case, the group pattern of the array of isotropic elements is given as


Q: Use the differential equation approach to find (4) for t> O in the circuit in the figure below. SH 1...

A: Referring the given circuit diagram, the switch is initially closed, and the inductor will be short ...


Q: A linear discrete time system has the characteristic equation of z3 -0.81 z=0. Determine whether the...

A: Any discrete time system is stable if all the roots of it’s characteristic equation lie within the u...


Q: f a grounding means does not exist in outlet, nongrounding-type receptacle can be replaced with GFCI...

A: As per NEC 2017, when the grounding conductor does not exist in the receptacle enclosure there is th...


Q: Some unknown material has a conductivity of 108 mho/m and a permeability equal to free space permeab...

A: For dc (frequency=0 Hz), the electric current is uniformly distributed throughout the material that ...