Such magnetic pseudo-conductor antennas are ideal for integration into a composite structure where the graphite composite backplanes can be integrated with dielectric ballistic protection materials that surround, yet do not interfere with the antenna. In ongoing research we have shown that such antennas can approach the theoretical Gain-Bandwidth Product (GBWP) limit for radiators limited to a surface. (This is the two-dimensional equivalent of the well know three dimensional Fano-Chu limit.) A unique feature of the design of these antennas is the ability to trade-off the permeability of the material against the cross section required to attain the desired GBWP performance. Thus we are able to minimize the weight and cost of the metamaterial while maximizing gain and bandwidth. The instantaneous bandwidth of the antenna is critical in applications where the same radiator is to be used over a very broad band of frequencies. We propose to demonstrate the capabilities of this technology in the form of a broadband radiator operating from 20MHz up, integrated into a structure suitable for the side panel of a vehicle performing an anti-IED. As Figure 2 suggests the baseline design for the antenna will be a linear horn, also known as Schelkunoffs V-antenna. This antenna uses as much of the area of the panel as possible as a radiating surface even though the material only occupies a perimeter within this area. Because of the small relative area occupied by the material this design also minimizes the likelihood that the antenna will be damaged if the panel absorbs weapons fire. Furthermore the fully conformal design eliminates any visual signature cues that could identify the vehicle carrying this panel as an anti-IED vehicle. Once the capabilities of this composite integrated antenna have been demonstrated, other variations can be visualized to meet many of the needs of ground vehicles. For instance, as Figure 3 suggests, a four fold V-antenna on a vehicle roof fed using a four-port mode-former (e.g. the kind used with four-arm spirals) can be used both as a jammer antenna for targets near the vehicle or as a high elevation (satellite) communication link.
|Effective start/end date||7/28/10 → 4/27/11|
- DOD: Navy: $30,000.00