COMBINED ANTENNA Russian patent published in 2005 - IPC

FIELD: radio engineering.

SUBSTANCE: proposed antenna has two oscillating systems where concentrations of different kinds of energy (electrical and magnetic ones) are combined or brought together as close as possible. Vertical biconical member used as main oscillating system has its cones made in the form of arrays of thin rods of approximately quarter-wavelength. Magnetic field with azimuthal lines of force is concentrated about power conductor in gap between slightly separated cone vortices. Meridian electric field built up by varying this field is unidirectional with meridian arcs of additional oscillating system which is, essentially, electric dipole whose axis is aligned with that of biconical member. Lower ends of arcs are joined with bottom vortex of cone (grounded) and upper ones run between top cone rods and are joined into node disposed above its vortex on symmetry axis. Upper end of additional electric dipole terminates in short rod directed upward from node along axis. Main and additional electric radiating dipoles are tuned to approximately same resonant frequency and coupling between them chosen to exceed critical value affords double-cavity (W-shaped) curve of standing wave ratio as function of frequency. Double-frequency antenna can be built with dipole-to-dipole coupling greater than critical value.

EFFECT: essentially enlarged frequency band.

1 cl, 2 dwg