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高分子论文翻译求助
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The free-space measurement system used in this study is schematically illustrated in Fig. 1. The equipment used for the measurement comprises a pair of spot-focusing type horn antennas (transmitting and receiving), a sample holder, and a coaxial cable connected to a HP8722D network analyzer. The horn antennas were equipped with biconvex polymeric lenses, focusing the electromagnetic waves on to the sample with a spot diameter~2–3 times that of the wave under consideration. The antennas were separated by a distance measuring twice the focal length (330 mm) of the lenses. The horn antenna (I) sends an electromagnetic wave onto the surface of the sample; and the waves transmitted through and reflected from thesample were collected by horn antennas (II) and (I),respectively. In order to minimize the measurement inaccuracies in the system, a through-reflect-line (TRL) calibration was carried out,whereasatime-domain gating was used to minimize the effects of residual mismatches, such as a mismatch in the source and load impedance [21]. After calibration, the woven fabrics were attached to a square cross-sectioned cardboard frame, and were placed into the sample holder mid-waybetweentwospot-focusinghornlensantennas.The reflected and transmitted portions of the electromagnetic wave were determined for single-layer woven fabrics in the frequency range of the spot-focusing horn lens antennas(17–40 GHz). Measurements were also carried out on various double-layer combinations of fabrics,in both in their asreceived state and after heat treatment to determine theeffect of changing the electrical conductivity and sequencing of layers on electromagnetic wave absorption potential. These combinations were measured by arranging two cardboard frame sets with sample fabrics back-to-back in the sample holder. In this way, double-layer combinations with a 1-mm spacing (thickness of the cardboard) between the layers were obtained, and the electromagnetic wave reflection and transmission losses of all combinations were examined through a repetition of the above procedure. |
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reko34
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