CASCADE SINGLE-PORT RESONANCE TRANSISTOR AMPLIFIER Russian patent published in 2016 - IPC H03F3/189 H03F3/19 H03F3/04 

FIELD: radio engineering.

SUBSTANCE: invention relates to radio engineering and can be used for building radio engineering and telecommunication systems of various purposes. Experimentally able to show that especially useful is the use of such cascade single-port amplifier when designing receiving-transmitting devices, for example, transponders, which functions are reception, processing, and reemission of radio or superhigh frequency signals in the direction of antenna system of the reading device. Novelty of the invention is introduction of additional cascades for signals amplification within the range of microwaves and radio frequencies. Each cascade of the amplifier is built as per regenerative circuit. Herewith the positive feedback is formed owing to designing a structural inductance either as an inductance coil with branches (terminals) of known diameter, of known length and with known number of turns, or as a piece of a microstrip line with branches (terminals) of known thickness, of known width of the substrate and known length. Cascade single-port resonance transistor amplifier has new properties, namely, considerably high gain (about 40 dB and more), that enables its use in radio systems of various purposes, for example, radio frequency identification systems, that provides longer range of their operation. Herewith the active element of the amplifier is chosen standard, and the operating mode of the transistor by the direct current is selected such, that amplification of each cascade is small, thus excluding additional adjustment of the amplifier and providing its stable operation. Number of connected cascades may be arbitrary, but as experience proves, usually it is limited by two-three.

EFFECT: more cascades in such amplifier increases the total gain (above 40 dB), that in turn leads to unstable operation of the amplifier in the transponder of the radio system as a whole.

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