DUPLEX ANTENNA Russian patent published in 1999 - IPC

FIELD: antenna equipment. SUBSTANCE: device has four first channel emitters, which are located over flat screen, are arranged in pairs in two orthogonal planes which are perpendicular to flat magnetic shield, and are fed with equal amplitudes with progressive quarter-phase shift. In addition device has second channel oscillator, which is located in center of flat metal shield. Goal of invention is achieved by design of first channel emitters as piece of conductor which length is equal to λ/2,, and shape follows quarter circle. Second channel oscillator is designed as piece of rigid coaxial line, in which length of outer wire is equal to λ/8,, where λ/4, is effective wavelength. Upper ends of each piece of conductor have length of λ - and are connected to upper end of outer conductor through short-circuited by-pass which length is λ/2. Outer conductor is connected to flat metal shield. Lower ends of conductors serve as input of first channel. EFFECT: increased isolation between channels, increased mechanical strength.