SBIR Phase I: Improved Microwave Absorbing Insulator- Conductor Composites with Tailored Frequency Response

*9661186阅读这一第一阶段小型企业创新研究项目将开发新型的微波吸收材料，有效地吸收宽频率范围(通常为八度)的微波辐射。吸波材料的基础材料具有介电特性，这些介电特性是水手频率的函数，从而从固定厚度的材料中产生强烈的宽带吸收。典型的厚度适用于铸造、柔性薄板和块状形状，也可以使用适用于涂料的介电常数较高的组合物。这些材料中的微波损耗和大部分介电常数的实部是由与定制陶瓷-导体复合材料的微观几何结构相关的强烈的非指数介电松弛引起的。在复合材料的加工过程中，吸振器的频率响应可以通过化学手段进行调节。将合成这些材料的测试样品，并在实验上证明其良好的频率响应和可调性。潜在的应用包括抑制杂散发射和来自消费者通信和计算机设备的干扰，以及抑制微波功率管和无源微波带线组件中的振荡。如果可以开发出非常薄的材料，在军事系统中就会有更多的应用。***

*** 9661186 Read This Phase I Small Business Innovation Research project will develop novel microwave absorbing materials that effectively absorb microwave radiation over wide ranges of frequency (typically an octave). The absorbers are based on materials that have dielectric properties that are functions of frequency in such a mariner as to create strong, wideband absorption from a fixed thickness of material. The typical thicknesses are appropriate for cast, flexible sheets and bulk forms, and compositions with higher dielectric constant suitable for paints are also possible. The microwave loss and the majority of the real part of the dielectric constant in these materials result from a strong, non-exponential dielectric relaxation associated with the micro-geometry of a tailored ceramic-conductor composite. The frequency response of the absorbers is adjustable by chemical means during the processing of the composite. Test samples of these materials will be synthesized and the favorable frequency response and tunability will be demonstrated experimentally. Potential applications include the suppression of spurious emissions and interference from consumer communications and computer equipment, and suppression of oscillations in microwave power tubes, and passive microwave strip line components. If very thin materials can be developed, there are additional applications in military systems. ***