How does a high-frequency antenna compare in size to a low-frequency antenna?

A high-frequency antenna is shorter in size compared to a low-frequency antenna because the physical dimensions of antennas are closely related to the wavelength of the signals they are designed to transmit or receive.

The wavelength of a signal decreases as the frequency increases. Since antennas are often designed to be a fraction of the wavelength (typically 1/2, 1/4, or other ratios), higher frequency signals result in antennas that are shorter. For example, a low-frequency antenna designed for frequencies in the kilohertz range will be significantly larger than a high-frequency antenna designed for frequencies in the megahertz or gigahertz ranges.

This relationship is rooted in the principles of electromagnetism and wave propagation, where higher frequencies yield shorter wavelengths, leading to the conclusion that high-frequency antennas are indeed smaller than their low-frequency counterparts.