Can a Half Dipole Antenna Function Inside a Resonant Cavity?

[Massi]

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

 

[berkeman]

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?

 

[Massi]

the system looks like this

massi

 

[berkeman]

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?

 

[Massi]

it is a simulation exercise,

cheers
massi

 

[berkeman]

it is a simulation exercise,

cheers
massi

What simulation software are you using? Please show us your work so far on this exercise...

 

[Massi]

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

 

[berkeman]

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

 

[Massi]

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

 

[berkeman]

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?

 

[berkeman]

Even simulating real antennas in an anechoic chamber with COMSOL is complicated...

https://cdn.comsol.com/wordpress/2015/06/biconical-antenna-in-an-anechoic-chamber-featured.png

 

[Massi]

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

 

[berkeman]

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...

 

[Massi]

It seems that soon I can chose or CST or comsol software but I should still learn how to do it..