PLANE RESONANT ANTENNA Russian patent published in 1997 - IPC

FIELD: antenna engineering; reception of frequency-modulated ratio and TV broadcasting signals; radar and radio communication systems. SUBSTANCE: antenna operating in 25 to 1000 MHz frequency range has open cavity in the form of multiturn arithmetic spiral mounted on insulating base; coupling turn placed is around spiral is a spaced relation to internal and external conductors of coaxial feeder series-connected to matched load whose impedance equals wave impedance of coaxial feeder. Start of spiral is connected to internal conductor of coaxial feeder; spiral conductor length is a multiple of half the maximum working wavelength in open cavity; coupling turn length equals , where λ₁ is maximum wave length of working range turn is external relative to spiral. EFFECT: extended working frequency range of antenna; improved matching of the latter with its feeder. 4 dwg