Non-Foster 회로를 이용한 FM 안테나의 신호 대 잡음비 개선

In this paper, we demonstrate a Non-Foster matching method for an electrically small antenna to improve the signal-to-noise ratio (SNR) of communication link. For the experiment, we used a general FM antenna whose resonance frequency is about 52–57 MHz and a floating type Linvill negative impedance converter(NIC)-based circuit as a Non-Foster matching element. By implementing the Non-Foster circuit to cover FM band, we can achieve a wide bandwidth matching covers 40–200 MHz. Our measurement shows 3–7 dB improvement of SNR for the same bandwidth though there are several spikes which means no improvement of SNR in the band.