SE, Kirtland AFB, NM 87117-5776. However, certain improvements could provide additional performance, in terms of gain, polarization purity, high-end bandwidth, sidelobe level, and mechanical ruggedness. Improvements are contemplated to our standard model with an 18-inch diameter. These improvements include optimization of the feed arm placement to improve gain, and the inclusion of a ground plane to improve polarization purity. We will also study the inclusion of absorbing material near the junction of the feed arms with the reflector, and the inclusion of edge treatments to reduce the sidelobe level.
Additional information is available here .
We have successfully developed a collapsible IRA with a four-foot diameter, that is lightweight, highly portable, and rugged. In addition, this device has low wind loading because the reflector is built from a conducting mesh fabric. This device has a FWHM impulse of 70 ps, and is effective from 100 MHz to 7 GHz. Additional information is available here . Time Domain Antenna Ranges Time domain antennas ranges can be used to obtain antenna pattern data much more economically than frequency domain ranges.