Yes, antenna radiation efficiency is indeed influenced by the wavelength of free space. The radiation efficiency of an antenna refers to the effectiveness with which it converts input power into radiated electromagnetic energy. It is typically expressed as a percentage.
The radiation efficiency of an antenna is influenced by various factors, including conductor losses, dielectric losses, and impedance matching. One key factor related to the wavelength of free space is the size of the antenna compared to the wavelength of the operating frequency.
When the dimensions of an antenna are much smaller than the wavelength, it is considered an electrically small antenna. Electrically small antennas often have lower radiation efficiencies compared to larger antennas. This is due to the fact that a significant portion of the input power is dissipated as resistive losses within the antenna structure itself, resulting in reduced radiation efficiency.
On the other hand, when the dimensions of an antenna are on the order of or larger than the wavelength, it is considered an electrically large antenna. Electrically large antennas tend to have higher radiation efficiencies since a larger proportion of the input power is radiated into free space rather than being dissipated as losses within the antenna structure.
In summary, the radiation efficiency of an antenna can be influenced by the wavelength of free space, particularly in the context of the antenna's size relative to the operating wavelength.