阻抗匹配
宽带
带宽(计算)
电气工程
驻波比
等效电路
晶体管
计算机科学
反射系数
电阻抗
输电线路
电子工程
声学
物理
天线(收音机)
工程类
微带天线
电信
电压
标识
DOI:10.1109/tap.2024.3351203
摘要
In this paper, a novel active impedance matching circuit with single transistor is studied for antennas to cover over hundred-octaves bandwidth. In the proposed matching circuit, only one field effect transistor (FET) is utilized and biased in the ohmic region. The FET is integrated with a dipole antenna at the gate, and connected with 50-Ohm transmission line at the drain. With small dimensions, this active antenna performs as a receiver with a wide impedance bandwidth of 10 MHz-1.9 GHz, in which the reflection coefficient is lower than -10 dB, covering 190-octave bandwidth. An equivalent circuit model of the ohmic-biased FET is built to analyze this unusual wideband performance, which exhibits promising applications in ultrawideband electromagnetic sensing systems with extremely restricted volume.
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