Welcome to WIFI Antennas

Register now to gain access to all of our features. Once registered and logged in, you will be able to contribute to this site by submitting your own content or replying to existing content. You'll be able to customize your profile, receive reputation points as a reward for submitting content, while also communicating with other members via your own private inbox, plus much more! This message will be removed once you have signed in.

Sign in to follow this  
Followers 0
TheMaksimys

Bifilar Helix Antenna with Reflector

Posted (edited)

Hi everyone,

Photo1.jpg

I am attempting to make this antenna to work for ISM band (868-915 MHz). It seems that I am having troubles with the feeding structure, since the measured Return loss barely represents what I observe in simulations. The antenna is designed for the characteristic impedance of 200 ohms, so I am using the Mini-circuits 4to1 balun and connecting the balanced side rigth to the ends of helix, just as in the simulation. I cannot really find the reason for the discrepancy in the results, since even if I am feeding the antenna with unbalanced 50 Ohms it still demonstrates the return loss that is way off from the simulated results. I am attaching the simulation file and a few photos of the prototype. Thank you for everyone who will contribute to the discussion of this topic!

 

 

 

 

 

BFHA_tests_3.cst

Antenna_Model.png

Antenna_Simulated_Sparams.png

Photo3.jpg

Photo2.jpg

 

 

 

Antenna_Measured_Sparams.png

Edited by TheMaksimys
1 person likes this

Share this post


Link to post
Share on other sites

,,,hi buddy...!!!

,,,you can try to do Clanon's impedance matching...

 

1 person likes this

Share this post


Link to post
Share on other sites
1 hour ago, Admin said:

,,,hi buddy...!!!

,,,you can try to do Clanon's impedance matching...

 

Unfortunately not really an option, since I was looking for a wideband solution, but thank you for pointing me to this post!

Share this post


Link to post
Share on other sites

,,,,these would be the results on your Bifilar Helix Antenna....!!!

screenshot_39.png

1 person likes this

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0