Abstract: The large wavelength at high-frequency (HF) band imposes critical challenges in platform conformal HF antenna designs, especially when multiple HF antennas are required in multifunction ...

Abstract: Antennas operating at the high-frequency (HF) band (3–30 MHz) are often electrically small due to the large wavelength of electromagnetic waves (10–100 m). Passive electrically small ...

A century ago, when the International Amateur Radio Union was formally founded, this hobby looked very different than it does now. The whole world was different then, the human evolution has ...