×
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

How to design a embedded FM radio antenna?

How to design a embedded FM radio antenna?

How to design a embedded FM radio antenna?

(OP)
Is it possible to design a small build in antenna for FM radio? (87.5MHz to 108MHz)
For example, patch antenna.

RE: How to design a embedded FM radio antenna?

FM radio antennas are not necessarily tuned or optimized for the actual band they operate in. A 1/4 wave whip needs to be ~30 inches long. Many hand-held radios compromise on size for style. A patch antenna at this frequency would be the size of a suitcase.

Dielectric loading could reduce the size of a patch but would narrow the bandwidth. "F" antennas are used to reduce size for frequency bands just above the FM band (Orbcomm and aircraft).

Previous pointers found in this earlier thread may help.
Thread247-75816

RE: How to design a embedded FM radio antenna?

In addition, many modern FM broadcast band radios have FET front ends.  The high input Z and relatively high gain of the FET RF amplifier makes lambda/4 antennas unnecessary and in high RF environments a detriment.

Unfortunately, in todays marketplace, often cheaper is better.

I am probably one of the very few people out there who would spend the extra money for an FM radio/receiver with decent selectivity and sensitivity...That's why the FM tuner in my home stereo is an ancient Sherwood monaural unit (The tuning indicator is a magic eye tube) with a home brew PLL FM MPX decoder and a home brew tunable SCA unit too...

Now that I think about it, the reason I use the old stuff might be because I'm really cheap...

I remain,
The Old Soldering Gunslinger

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