Evolved-profile dielectric rod antennas

A systematic approach is presented for the design of profiled dielectric rod antennas that satisfy specified radiation pattern objectives. The approach uses a body of revolution method of moments technique to rapidly analyze arbitrarily profiled dielectric rods while a genetic algorithm is used to achieve the design objectives. As examples we present dielectric rod designs optimized for maximum gain and low sidelobes. These designs are compared with a conventional linear profile design. Measured results are presented and these are shown to agree well with the calculated radiation patterns. We show that improved gain and sidelobe performance is achieved using a non-linear rod profile compared to a standard linear profile. The generality of the approach is demonstrated with a shaped beam antenna design that has a cosecant-squared pattern.10 page(s

Microwave radar for detection of resin defects in Pinus elliottii Engelm var elliottii

Surface penetrating microwave radar is identified as a low-cost, reliable, portable, and safe means of detecting resin defects in plantation-grown pine logs. This new method of non-destructively testing logs has the potential to be applied at several intervention points in the value chain, including on standing trees, fallen stems, and merchandised logs either in the forest or in the mill. Results clearly distinguish resin-affected logs from unaffected logs, even in logs of high moisture content

A 600 GHz dielectric rod antenna

Dielectric rod antennas have advantages as elements of focal plane arrays for imaging applications at terahertz frequencies. As well as good directivity and moderate bandwidth they are readily integrated with diode detectors. To demonstrate these attributes we describe the fabrication of a prototype antenna by laser ablation. Theoretical and measured results are presented for a dielectric rod antenna operating at 600 GHz.3 page(s

A 600 GHz imaging system for application exploration

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