I'm a hobbyist and I'm designing a PCB in Eagle that include micro controller and RF receiver and transmitter, 2 modules of 433mhz and 2 of 315mhz,

I have a defined place on the PCB of 10x50 mm for the 433mhz antenna, and another 10x50mm for the 315mhz.

I searched the entire web and could not find a design, I created a simple doodle of antenna (i have no experience in antenna design... and this might be horribly wrong)

So this question is for the experienced ones out there:

How should a 433mhz trace antenna look like in 10x50mm space?

How should a 315mhz trace antenna look like in 10x50mm space?

I uploaded a picture of what i got so far. enter image description here

Thanks for the help!


2 Answers 2


Texas Instruments has an excellent application node on antenna design. Antenna design from scratch is not a trivial exercise and if you don't have experience or access to expensive modeling software, you'd be best using a proven reference design. There are probably countless other reference designs for a 433Mhz and 315Mhz PCB antenna. Be careful though, a multi-antenna system can be a completely different beast than a single antenna system.

  • 1
    \$\begingroup\$ Also, check Eagle's public libraries. Someone has probably already created a trace antenna as a footprint that you can drop in. I know I found a 2.4 GHz antenna several years ago in a lib on the Eagle public lib page. \$\endgroup\$
    – Smith
    Aug 8, 2016 at 17:41
  • \$\begingroup\$ Thanks, but i'm loosing my mind, I searched EVERYWHERE and did not find a single library of antennas no 433mhz and no 315mhz, i did found some 2.4ghz... but it's no good for me... This is so weird because 433+315 are so commonly used... ALSO: where is this public lib page? cadsoft.io/resources/libraries no results there... \$\endgroup\$
    – itai
    Aug 8, 2016 at 18:32

Perhaps this information will be helpful.

Search Engine for EAGLE Libraries http://www.diymodules.org/eagle-search?text=315+MHZ+PCB+antenna&type=dev%2Cpkg%2Csym&lib=usr%2Cstd

PCB Antenna Reference Designs http://hackaday.com/2014/02/28/pcb-antenna-reference-designs/

I had more links but can not post them due to low reputation. If you need more ask and maybe I can post more in a different reply.

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    \$\begingroup\$ nope... those links do not help... actually i found at ti website a evolution board for 433mhz chip with pcb antenna, and the provided a gerber files, so i importand the copper layers from them (i'ts a top to bottem lines using vias, hili antanna)... and i did the same for 315mhz i found gerber files online for same kind of antenna... check this out: ti.com/tool/cc11xlemk-433 \$\endgroup\$
    – itai
    Aug 14, 2016 at 13:51

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