Abstract
A conventional passive matching method cannot be used for a low-frequency ultrawideband (UWB) antenna of high performance. In this paper, an amplifier module is combined with a short monopole antenna to design a high-performance active receiving antenna for 10 kHz–100 MHz UWB through model simulation. In addition, theoretical analysis of the antenna’s noise is made, and the theoretical basis for improving the sensitivity of the active antenna is obtained. Finally, the amplifier module is fabricated and the sensitivity of the antenna is tested using the equivalent capacitance substitution method. Tests show that the active antenna has very high sensitivity, bandwidth, and gain, and can be applied to cosmic radio signal detection.
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