A non-Foster matching network of the receive loop antenna is applied to VLF (very low frequency) band in this paper. Based on an open stable negative impedance converter (NIC) by Linvill, a 1 Ã 1 m rectangular loop antenna is equivalent as a two-port network, and the non-Foster matching and optimization are realized by a series tunable negative capacitance and negative inductance. The stability of the non-Foster matching network is analyzed and verified also. The results show that compared with the traditional passive matching network from 15 to 30 kHz, by using the non-Foster matching technique, the receive antenna's input reactance is sufficiently canceled by the negative elements, the −10 dB S 11 fractional bandwidth is improved by 64.9%, the total network's efficiency is improved over most frequency bands.
This paper proposed a method of dynamic MSK tuning to improve the transmission efficiency of the transmitting antenna, on the basis of traditional MSK tuning method in the VLF (very low frequency) transmitting antenna tuning circuit. The basic principle of MSK traditional and dynamic tuning method were analyzed first, and theoretically proved that MSK dynamic tuning performed better compared with the MSK traditional tuning. And the ADS software was used to simulate, analyses and verify the traditional and dynamic tuning circuit of the VLF transmitting antenna tuning circuit. The simulation results show that: The dynamic tuning performance is superior to the traditional tuning performance of the VLF transmitting antenna.
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