×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Dual band discone antenna

Dual band discone antenna

Dual band discone antenna

(OP)
Trying to design a dual-band (Band A: 20 MHz-180 MHz, Band B: 500 MHz - 3000 MHz) discone antenna for IED supression. I have managed to design a discone for Band B achieving a VSWR < 2.5. Any ideas on how i can make the discone work for band A?

The antenna i'm trying to design is similar to the one found on this link Link

RE: Dual band discone antenna

20 mhz discone size needs 1/6 Lambda or 8 foot wires, or a triangular flag, metallized, attached to the discone top. There is no Magic, you need large size. 20-3000Mhz continuous should be the goal. Your needs are too wideband for any tuned device with a magical solution. you could use part of the vehicle possibly. The 20 Mhz gain in the link sounds too low. A transformer 4:1 or higher can help at the low end. 20 Mhz gain for a 0.03 Lambda antenna requires a 25 foot groundplane. Without big groundlanes it would be -20 dbi gain.
I see in their specs, http://atecorp.com/atecorp/media/pdfs/data-sheets/... gain is -25 dBi at 20 Mhz, so Marketing is alive and well. They have optional amplifiers. Maybe marketing used them to pretend gain at 20 mhz is -5 dBi, liars.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources