Can a Half Dipole Antenna Function Inside a Resonant Cavity?

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Discussion Overview

The discussion revolves around the feasibility and implications of placing a half dipole linear antenna inside a conductive resonant cavity. Participants explore the theoretical and practical aspects of this configuration, including its resonance characteristics and simulation challenges.

Discussion Character

  • Exploratory
  • Technical explanation
  • Homework-related
  • Mathematical reasoning

Main Points Raised

  • Some participants inquire about the behavior of a half dipole antenna when integrated into a conductive resonant cavity, questioning how the cavity functions as part of the antenna.
  • There is a request for visual aids, such as sketches, to better understand the configuration of the antenna within the cavity.
  • Some participants express uncertainty about the resonant modes that might be achieved with this setup, suggesting it may only resonate in complex modes.
  • One participant clarifies that the exercise is a simulation task, seeking recommendations for simulation software and resources related to antenna theory.
  • Another participant notes the complexity of simulating antennas in an anechoic chamber, highlighting the challenges involved in the calculations.
  • There is a discussion about the participant's background in antenna theory and electromagnetic theory, with a suggestion of a textbook that may be helpful.
  • Some participants emphasize the necessity of using simulation software like COMSOL or CST for accurate modeling of the system.

Areas of Agreement / Disagreement

Participants generally agree that simulation software is essential for solving the problem, but there is no consensus on the specific methods or configurations that would be most effective. The discussion remains unresolved regarding the optimal approach to modeling the antenna within the cavity.

Contextual Notes

Limitations include the complexity of the resonant modes achievable with the proposed setup and the potential challenges in simulating the near-field effects of the cavity on the antenna's performance.

Who May Find This Useful

Students and researchers interested in antenna design, electromagnetic theory, and simulation techniques in the context of resonant cavities may find this discussion relevant.

Massi
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Hi ,
what happen if a half dipole linear antenna is placed inside an electric conducting resonant cavity? The cavity itself is the conductive ground of the half dipole antenna. How can I solve such problem in which the cavity works as resonant cavity and it is part of the antenna itself?
Cheers
massi
 
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Massi said:
Hi ,
what happen if a half dipole linear antenna is placed inside an electric conducting resonant cavity? The cavity itself is the conductive ground of the half dipole antenna. How can I solve such problem in which the cavity works as resonant cavity and it is part of the antenna itself?
Cheers
massi
Can you post a sketch of the antenna inside of the resonant cavity? Given the antenna pattern of a monopole antenna, I'm having trouble visualizing a resonant cavity shape that would work.

And why use a monopole antenna instead of a full dipole antenna if you want to make this work inside a resonant cavity?
 
the system looks like this

upload_2017-3-20_17-43-53.png

massi
 
Massi said:
the system looks like this

View attachment 114803
massi
That only looks like it would be "resonant" in some very complex modes. What is the overall goal with this? Is it just an exercise in simulation for school, or does it have some practical application?
 
it is a simulation exercise,

cheers
massi
 
Massi said:
it is a simulation exercise,

cheers
massi
What simulation software are you using? Please show us your work so far on this exercise...
 
I just need to solve this exercise to calculate the system behaviaur, please if you have a book about it or suggestions I really appreciate.
thanks in advance
cheers
massi
 
Massi said:
I just need to solve this exercise to calculate the system behaviaur, please if you have a book about it or suggestions I really appreciate.
thanks in advance
cheers
massi
That will be a pretty complicated solution without useing COMSOL or a similar simulation package. What is your background in antenna theory and E&M. What year are you at university? Which class is this for?

Have you had basic antenna theory like in this book?

https://images-na.ssl-images-amazon.com/images/I/51Kzq7CA0cL._SX388_BO1,204,203,200_.jpg
51Kzq7CA0cL._SX388_BO1,204,203,200_.jpg
 
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I am in the last year, I have some experience with cavity and antenna radiation but I am not such expert, I didn't know this book thank you
m
 
  • #10
Massi said:
I am in the last year, I have some experience with cavity and antenna radiation but I am not such expert, I didn't know this book thank you
m
Your sketch shows the reflecting cavity in the near field. That also will make the calculations/simulations more complex. Is that your intent?
 
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  • #12
berkeman said:
Your sketch shows the reflecting cavity in the near field. That also will make the calculations/simulations more complex. Is that your intent?
yes it is that
 
  • #13
Massi said:
yes it is that
Well, I don't think you'll be able to make much progress without using simulation software. Do you have access to COMSOL or a similar E&M simulation package through your university? I don't see how they could give you an assignment like this without giving you access to proper simulation software...
 
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  • #14
It seems that soon I can chose or CST or comsol software but I should still learn how to do it..
 

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