SMALL-SIZE ACTIVE TV ANTENNA Russian patent published in 1997 - IPC

FIELD: antenna devices, in particular, for receiving TV signals in first, second and third meter and decimeter ranges in heavily developed urban regions and country side. SUBSTANCE: device has symmetric ribbon frame which total length l is less than 0.4 λ₁, where λ₁ is maximal wavelength of first channel. Break of ribbon frame contains active resistor and low-noise amplifier. Total frame length l and ribbon width h conforms to conditions 0,281λ₁≅l≅0,357λ₁ and 0,0087λ₁≅h≅0,0162λ₁, in order to increase sensitivity in operating range of 1-12 TV channels. Low-noise amplifier is connected to symmetric output of frame through wide- band balancing transformer which transformation ratio is 4: 1. Gain of proposed antenna in active mode in comparison to isotropic emitter is in range of 14 to 25 dB for bandwidth of 1-33 TV channels, signal-to-noise is ratio at least 15 dB for all TV channels of meter and decimeter range. EFFECT: increased field of application, increased sensitivity. 7 dwg