Horn and feed antennas can be divided into two categories for the purpose of the analysis of the radiation characteristics: (i) antennas which consist of a well defined aperture with imposed electric and magnetic fields over the aperture and which are a few wavelengths in cross section. This category includes most of the horns and open-ended waveguides used as feeds. The electromagnetic process of determining the fields across an aperture can be separated from the process of determining the radiation characteristics of the fields in the aperture; (ii) antennas which are small in size and in which the currents on the antenna structure determine the radiation characteristics directly.

Inspec keywords: horn antennas; antenna feeds; antenna radiation patterns; aperture antennas

Other keywords: open-ended waveguide; antenna radiation pattern; aperture antenna; electromagnetic process; horn antenna; feed antenna; magnetic fields

Subjects: Single antennas