Modern ham radio operators often face restrictions on antennas. This has made small antennas more popular, despite some limitations. [Tech Minds] reviews the GA-450 indoor active HF loop antenna an… ...

From there it is simple math – 40m/cycle * 5,666,000 cycles per second = 226,640,000 meters per second or 75.6% of the speed of light.

In this paper, we take an innovative approach to the design of RFID loop antennas. As we want to increase the reliability of HF RFID systems, we need to step away from the traditional circular antenna ...

At present, portable receivers generally use ferrite rod antennas for LF and MF (below 2 MHz), and whip antennas for HF (up to 30 MHz). Each type has proved effective in its particular application ...

Abstract: In this paper, we take an innovative approach to the design of RFID loop antennas. As we want to increase the reliability of HF RFID systems, we need to step away from the traditional ...