Induced currents on a pair of separated dipole antennas

In summary, the study of induced currents on a pair of separated dipole antennas explores how electromagnetic fields generated by one antenna can affect the current distribution in a nearby antenna. This interaction is influenced by factors such as the distance between the antennas, their orientation, and the frequency of operation. The findings highlight the importance of considering mutual coupling effects in antenna design and performance, as these induced currents can significantly alter the radiated patterns and impedance characteristics of the antennas involved.
  • #1
yefj
34
2
Homework Statement
induced current from incident E-fiels
Relevant Equations
mutual impedance
Hello, I need to calculate the expression for a current on two dipoles separated as shown in the attached full task .
I need to present a solution,lets take the simplest case.
Theta_in=0
1720456964545.png

I need to find the expression for the currents on the dipoles.

https://eceweb1.rutgers.edu/~orfanidi/ewa/ch24.pdf
My E-field is in Z direction and the phase is a viarable of X.
1.What expression should i use to get the current on the dipole?

After that i opened chapter 25
https://eceweb1.rutgers.edu/~orfanidi/ewa/ch25.pdf
I see that there are expressions for mutual impedance.
2What strategy do you recommend me to use to get the current on the other dipole?
Thanks.
 

Attachments

  • task.pdf
    156.4 KB · Views: 20
Physics news on Phys.org
  • #2
Welcome to PF.

This is your schoolwork, so you need to show the Relevant Equations and your Attempt at the Solution. We do not do your homework for you.

Please show us some of your work, and please use LaTeX (see the "LaTeX Guide" link at the lower left of the Edit window). Thanks.
 
  • #3
Hello berkerman, first of all I want to see what current is being induced on a single dipole.
So the question is what formula should I use for this purpose?
I have the following manual
https://phys.libretexts.org/Bookshelves/Electricity_and_Magnetism/Electromagnetics_II_(Ellingson)/10:_Antennas/10.11:_Potential_Induced_in_a_Dipole
from the manual formula (10.11.7)
$$\widetilde{V}_1^r = -\widetilde{\bf E}_2({\bf r}=0) \cdot \hat{\bf \theta} l_e \nonumber$$
(latex is not converting code into formula)
is the right
What is my l_e and E(r=0) given my task?
Given that this the correct formula ,How given Voc i get the induced current on a single dipole?
Thanks.
1720466572809.png

$$
 

FAQ: Induced currents on a pair of separated dipole antennas

What are induced currents on dipole antennas?

Induced currents on dipole antennas refer to the electric currents that are generated in the antennas due to the interaction with an external electromagnetic field. When an alternating current flows through one dipole antenna, it creates a time-varying electric and magnetic field, which can induce a current in a nearby dipole antenna through electromagnetic induction.

How does the separation distance between dipole antennas affect induced currents?

The separation distance between dipole antennas significantly influences the magnitude of the induced currents. As the distance increases, the strength of the electromagnetic field diminishes, leading to weaker induced currents. Conversely, closer proximity results in stronger coupling and higher induced currents due to the more intense electromagnetic interaction.

What factors determine the strength of induced currents in dipole antennas?

The strength of induced currents in dipole antennas is determined by several factors, including the frequency of the alternating current, the orientation of the antennas relative to each other, the polarization of the emitted electromagnetic waves, and the material properties of the antennas. Higher frequencies typically result in greater induced currents, while optimal alignment and polarization can enhance the coupling effect.

Can induced currents affect the performance of dipole antennas?

Yes, induced currents can affect the performance of dipole antennas by altering their impedance and radiation patterns. The presence of induced currents may lead to undesired interactions, such as detuning the antenna or causing interference with the intended signal. This can result in reduced efficiency, altered gain, and changes in the overall radiation characteristics of the antennas.

What practical applications utilize the concept of induced currents in dipole antennas?

Induced currents in dipole antennas have several practical applications, particularly in wireless communication systems, radar technology, and sensing devices. They are used in applications such as antenna arrays for beamforming, RFID systems for tracking, and in the design of wireless power transfer systems where efficient energy transfer is critical. Understanding induced currents helps optimize the performance and functionality of these systems.

Back
Top