Efforts are currently underway to improve the performance of small electric antennas and resonator-based antennas embedded in the civil infrastructure. One of the main limitations of these small antennas is that they have narrow bandwidths which limit their use when embedded in concrete. The present work shows that by changing the amount of iron (III) oxide microparticles in a cementitious matrix, not only does the impedance matching of the embedded array improve by as much as 20 dB, it also produces a lesser shift in resonant frequency (RF) than the original cementitious matrix alone. This indicates lesser detuning of the embedded antennas when iron (III) oxide is added. Further analysis of antenna transmission coefficient S₂₁ values shows that adding 4% iron (III) oxide into cement paste improves the RF power transmission into the material compared to the control by as much as 7.29 dB. Given that iron (III) oxide microparticles are easily available as admixture pigments for coloring mortar or concrete, it is possible to fast-track implementation of this application in new construction.

当前正在努力改善嵌入在民用基础设施中的小型电子天线和基于谐振器的天线的性能。这些小型天线的主要限制之一是它们的带宽很窄，这限制了它们在混凝土中的使用。目前的工作表明，通过改变水泥基体中氧化铁（III）微粒的数量，不仅嵌入式阵列的阻抗匹配提高了多达20 dB，而且共振频率的偏移也较小（RF ）比原来的水泥基单独。这表明添加氧化铁（III）时嵌入式天线的失谐程度较小。天线传输系数S _21的进一步分析值显示，与水泥浆相比，向水泥浆中添加4％的氧化铁（III）可以将射频功率传输到材料中，与对照相比可提高7.29 dB。鉴于氧化铁（III）微粒很容易作为混合颜料用于灰浆或混凝土的着色剂，因此可以在新建筑中快速实施此应用程序。