Hi everyone, I have an OOK signal with a carrier frequency of 20 MHz and I am looking to design an interfacing transmitter antenna. Given that the wavelength is 15 meters, a 1/4 wavelength antenna would be much too large for my application. I am wondering if a near field antenna, similar to what is used for RFID, would give me a couple meters read range at this frequency, given the antenna was driven with enough power and designed correctly. A design methodology similar to the below pdf is what I am thinking, but for 20 Mhz.
http://www.st.com/st-web-ui/static/...ical/document/application_note/CD00221490.pdf
http://www.st.com/st-web-ui/static/...ical/document/application_note/CD00221490.pdf