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Negative impedance converters (NIC) are widely used for impedance matching of electrically-small antennas (ESA). For example, impedance of electrically-small monopole antenna contains high capacitive component and negative capacitance can be used to compensate this. Such negative capacitance can be realized with the use of NIC circuit based on wideband and low noise operational amplifier. Most of...
This paper deals with extending bandwidth of electrically small antenna using negative impedance converter that acts as a negative reactance. Using the idea of negative impedance converter an active reactance circuit is proposed to cancel the imaginary part of electrically small antenna impedance and thus matched antenna to the transmitter over a wide band. Furthermore, design and measurement results...
As an antenna becomes smaller, its input reactance increases to greater than its input resistance, resulting in a significant increase of it radiation quality factor and drastic decrease of its bandwidth. Therefore, there is a need for a matching network at the antenna terminals, which may be devised by negative impedance converters (NIC). In this paper, non-Foster impedance matching networks are...
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