315 MHz Duck Antenna

[tomasbj 5]

Hi guys,

 

I was impressed when searching online and I saw the 315MHz Rubber Duck Antenna. 

 

How is that possible? What is the shape inside of it? How can an antenna of 5 cm length to have a gain of 2 dBi? 

 

Please check this link: https://ctrfantennasinc.com/small-315-mhz-antenna-low-profile-antenna/

 

 

[Admin 2578]

,,,this is inside..!!!

[tomasbj 5]

Hello, thanks for your answer @Admin . Apart, to make this antenna work at those frequencies and have 2dBi gain... should this antenna have an amplifier and matching network? I made my own model and the gain is very low. Thanks in advance for your help.

 

 

[Admin 2578]

,,,could you build something like this...???

[tomasbj 5]

Sure. I understand that this circuit solves the gain problem. I have never used somehitng like this. Thanks for your suggestion