Abstract: An omni-directional antenna assembly is provided for wireless communication devices requiring multiple polarization characteristics. A loop antenna assembly for a communications device operating at a predetermined wavelength and having a transceiver circuit including a signal output and a ground plane, the antenna assembly including a conductive loop element and a conductive leg member coupled to the loop element proximate a loop perimeter, the leg member for supporting the loop element at a distance away from the ground plane of the communications device, the leg member also defining a ground point and a feed point for operatively coupling the loop element to the ground plane and the signal output, respectively, of the transceiver circuit.

Abstract: An omni-directional antenna assembly is provided for wireless communications devices requiring multiple polarization characteristics. An antenna assembly for a communications device operating at a predetermined wavelength and having a transceiver circuit including a signal output and a ground plane, the antenna assembly including a conductive planar element disposed away from the ground plane and a conductive leg member coupled to the planar element proximate a perimeter, the planar element being disposed a distance away from the ground plane of the communications device to define a region capable of receiving one or more components associated with the wireless communications device.

Abstract: Flow cells and stationary-sample vessels (test tubes) are used sequentially in the same dual-function nuclear magnetic resonance (NMR) probe. The user can easily convert the probe between flow and stationary-sample configurations without removing the probe housing. Tapered guiding surfaces are provided for guiding stationary-sample vessels from above and flow cells from below to respective measurement positions. Sample flow connection tubing used during flow measurements is accommodated within the probe during stationary-sample measurements. The dual-function NMR probe is useful in continuous flow-through, stop-flow, and fixed-sample analysis applications, including applications that couple high-pressure liquid chromatography (HPLC) with nuclear magnetic resonance spectroscopy and applications for analyzing small quantities of stationary organic samples.

Abstract: A magnetic field generated by windings supported by a cylindrical former having axis Z is established in a desired direction forming an angle &PHgr; with respect to Z. Over an interval on Z, substantially constant value for the desired field and substantially vanishing orthogonal components are achieved by specifying the current distribution on the cylinder as a solution to field equations and then approximating said current distribution in a discrete conductor forming a plurality of anharmonic loops, nonlinearly spaced in accord with said solution.