p ]Radio-Freouencv (RF). millimeter and microwave circuits and devices have become increasingly important and must continue to be improved in compactness, power consumption and production cost. These devices are often constrained by the limited choice of materials because cefiain desirable properly combinations are simply unavailable. If the material itself could be custom-designed for each application, more efficient and compact antenas could be created. This paper presents design and fabrication efforts base don employing customized artificial materials, or metamaterials which use off-the-shelf dielectrics to produce composite substrates, which are then applied as p a of the overall component design of a variety of miniaturized antennas. To develop these novel designs, a variety of issues need to be addressed: First, a eeneral mathematical framework is needed to conduct rigorous analysis of composite materials without imposing any geometric and materils restrictions. Second, a versatile design method is required to find the best geometric and mterial configuration of the device. To address these issues the Solid Isotropic Materials with Penalization method (SIMP)  is intefrated with a Fast Hybrid Finite-Element Boundary Integral tool (FE-BI) . This approach is then used to develop full 3D resonant and broadband antenna designs. Finally, new fabrication techniques such as the Thermoplastic Green Machining  and Dly Powder Deposition suitable for the realization of the designed 3-D spatial anangement of multi-material ceramic and polymer dielectric composites are introduced. Challenges and promises regarding the daign and fabrication techniques are discussed. It is demonstrated that the capability to manipulate the distribution of properties within the dielectric materials and the realization of these composites in full 3-D is critical to enable dramatic improvements in antenna performance, and to overcome traditional daign tradeoffs between efficiency, bandwidth, and miniaturization. The development of these new material compositions give infinite possibilities in the design of advanced composite RF and millimeter wave systems including high performance, 3D integated and vertically packaged circuitly.
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- Topology optimization and fabrication of multi-material dielectrics for antenna performance improvements
- Springer Netherlands
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