Can a Half Dipole Antenna Function Inside a Resonant Cavity?

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SUMMARY

A half dipole linear antenna placed inside a conductive resonant cavity functions as both the antenna and its ground. The complexity of this configuration requires advanced simulation tools such as COMSOL or CST for accurate modeling. Participants in the discussion emphasized the necessity of a solid understanding of antenna theory, particularly in the context of electromagnetic (E&M) principles, to effectively tackle the problem. The discussion also highlighted the importance of visualizing the antenna's placement within the cavity to facilitate better simulation outcomes.

PREREQUISITES
  • Understanding of half dipole antenna theory
  • Familiarity with electromagnetic (E&M) principles
  • Experience with simulation software like COMSOL or CST
  • Basic knowledge of resonant cavity design
NEXT STEPS
  • Research the use of COMSOL for simulating antenna behavior in resonant cavities
  • Study advanced antenna theory, focusing on cavity-backed antennas
  • Explore the principles of electromagnetic wave propagation in conductive materials
  • Learn about the design and analysis of resonant cavities in RF applications
USEFUL FOR

Students in electrical engineering, antenna designers, and researchers working on electromagnetic simulations will benefit from this discussion.

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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