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That’s a schematic of a class E amplifier.
It consists of a IRFD110 MOSFET transistor, a shunt capacitance Co (the transistor internal capacitance), a series L2C1 circuit, a Pi-Network filter (C2/C3, L3, C4) , R2 resistor, antenna . The shunt capacitor Co is made up by the internal output capacitance of the transistor. The transistor in this case operates as a switch and drives the load network Co, C1, L2, Pi-network, R2. The design of this load network is done such that the voltage and current through the drain of the transistor are out of phase while power is delivered to the R2||antena. This offset implies that no power is dissipated in the transistor, thus the efficiency is ideally 100%. The matching network primary purpose is to filter-out internally generated harmonics of the fundamental frequency due to the non-linear class E amplifying-device (bias conditions necessary for high efficiency).
That’s a schematic of a class E amplifier.
It consists of a IRFD110 MOSFET transistor, a shunt capacitance Co (the transistor internal capacitance), a series L2C1 circuit, a Pi-Network filter (C2/C3, L3, C4) , R2 resistor, antenna . The shunt capacitor Co is made up by the internal output capacitance of the transistor. The transistor in this case operates as a switch and drives the load network Co, C1, L2, Pi-network, R2. The design of this load network is done such that the voltage and current through the drain of the transistor are out of phase while power is delivered to the R2||antena. This offset implies that no power is dissipated in the transistor, thus the efficiency is ideally 100%. The matching network primary purpose is to filter-out internally generated harmonics of the fundamental frequency due to the non-linear class E amplifying-device (bias conditions necessary for high efficiency).
That’s an small transmitting LOOP ANTENNA (Army/Patterson Loop) very useful when space for a full size antenna is limited, coupled to the transmitter output via capacitor feed system.
The capacitors in series (C31,C32) are for impedance matching. The capacitor across gap in loop(C33, C34, C35) - tunes for resonance frequency. The parallel resistance across LC circuit(R31) will "damp" the oscillation and decreasing the quality factor will causing an increase in the antenna bandwidth.
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