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

* 9661186阅读 第一阶段的小企业创新研究项目将开发新型微波吸收材料，有效吸收宽频率范围内的微波辐射（通常是倍频程）。吸收器基于具有介电特性的材料，该介电特性是频率的函数，以便从固定厚度的材料中产生强的宽带吸收。典型的厚度适合于浇铸、柔性片材和散装形式，并且具有适合于涂料的较高介电常数的组合物也是可能的。这些材料中的微波损耗和介电常数的大部分真实的部分是由与定制的陶瓷-导体复合材料的微观几何形状相关联的强的非指数介电弛豫引起的。在复合材料的加工过程中，吸收器的频率响应可通过化学方法调节。将合成这些材料的测试样品，并通过实验证明其良好的频率响应和可调谐性。 潜在的应用包括抑制来自消费者通信和计算机设备的杂散发射和干扰，以及抑制微波功率管和无源微波带状线组件中的振荡。如果能够开发出非常薄的材料，在军事系统中还有其他应用。 ***

*** 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. ***