Bian Wu

Feb 15, 2023 | mdpi.com | Bian Wu |Biao Chen |Shuai Ma |Ding Zhang

3.2. Measurement ResultsThe reflection coefficient was measured using the free space method. The measurement set-up is shown in Figure 8. Due to the extremely broad frequency band, the measurement was carried out with two horn antennas of 2–18 GHz and 18–40 GHz, respectively. According to the far field conditions, the electromagnetic energy emitted by the horn antenna will radiate to the sample area in the form of plane waves.