do i need an arduino for a rf frequency?

 i want to make a simple circuit that would have 2 devices that are linked 

I assume that the link you are refering here is a wireless link. In that case you need some type of wireless communication between two microcontrollers. In these cases RF would be a good choice. You have lot of options here like 433Mhz RF, NRF24l01, LoRa, etc... If you want a decent range and payload you can try the NRF24L01 module

https://circuitdigest.com/microcontroller-projects/interfacing-nrf24l01-with-arduino-transmitter-and-receiver-tutorial

The abovel ink will help you get started