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We introduce a new geometric construction of cyclic group codes in odd-dimensional spaces formed by intersecting even-dimensional constant curvature curves with hyperplanes of one less dimension. This allows us to recast the cyclic group code as a uniform sampling of a constant curvature curve whereby the design of the constant curvature curve controls code performance. Using a tool from knot theory...
This paper presents a multi-mode, planar array made up of co-located elements. The array operates in dual-bands, S- and X-band, with dual-polarizations. The dual-band operation necessitates different electrical spacing between the S-band and X-band array elements. We optimize the electrical spacing by co-locating dual-band radiating elements with X-band only elements. The enabling technology for the...
We present a multi-band and dual-polarization microstrip antenna designed for the S- and X-bands. The S-band element is an annular ring shorted with vias on the inner edge to suppress surface waves. The X-band element is a combination of a concentric annular ring slot shorted on the outer edge and a narrowband patch. All elements achieve circular polarization by truncating opposing corners of the...
We present a scalable, dual-band and dual-polarization microstrip antenna designed for the S- and X-bands. The S-band element is a microstrip square annular ring shorted with vias on the inner edge to suppress surface waves. The X-band element is a concentric annular ring slot shorted on the outer edge of the slot. Both elements achieve circular polarization by truncating opposing corners of the two...
In this study we introduce a new class of bandwidth-expansion source-channel codes for analog error correction that can work in any even dimensional space and show superior performance in the low SNR region. Our codes are constructed as geodesics on flat tori as previous studies have done, but we use a tube radius construct derived from the global circumradius function. We prove that geodesics on...
A dual-band element that operates with dual-circular polarisation in two separate industrial, scientific and medical bands is presented. The design that is based on concentric square slot/shorted-ring configuration is realisable in cost-effective printed circuit board technology making it attractive for low-cost personal communications devices. The antenna element provides a flexible topology that...
The communications link and system aspects of active phased arrays that are used in multiple-beam satellite systems are assessed through measurements and analysis. Three link parameters are investigated and their effects on the overall carrier-to-interference ratio (CIR) are quantified. The first parameter is the intermodulation components that are generated at the nonlinear amplifier outputs and...
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