"The quarter-wave dipole"

A new type of dipole antenna has been developed, which at a length of 0,25 to 0,3 wavelengths is matched to a coaxial line or a twin line. In principle the antenna may be considered as a special form of a folded dipole (or unipole). The theory of this antenna is discussed, leading to the impedance properties of unsymmetrically fed antennas. The method has been particularly advantageous in designing a low height, broadband aircraft antenna, in which case the radiating and feeding elements form parts of a micro-strip system. Also other applications have been considered, such as shortened antennas for VHF and UHF TV and broadcast receivers. In an appendix general formulas for impedance-loaded folded dipoles are developed and applied to a special case.