Experimental demonstration of a 35 GHz holographic antenna
We have developed a novel two-dimensional grating antenna based on microwave holography. The two-dimensional grating (hologram) is formed on a dielectric substrate and fed by an integrated surface wave exciter. Various design issues will be presented, as will a 35 GHz demonstration prototype antenna designed, fabricated, and tested. Measured radiation patterns closely agreed with the theoretical prediction.
Holographic antenna concept, analysis, and parameters
The paper describes a new holographic antenna concept that uses a diffraction pattern (hologram) formed on a dielectric substrate and fed by a surface wave. Analytical models and necessary design tools have been developed to investigate the feasibility of this new concept. A demonstration prototype antenna was designed, fabricated, and tested, and the measured radiation patterns at 35 GHz showed good agreement with the theoretical prediction.
Optical rotatory dispersion and absolute configuration—III
Abstract Optical rotatory dispersion measurements on pyrrolidine, piperidine, and tetrahydro-isoquinoline alkaloids indicate that the absolute configuration of the α-asymmetric center may be assigned directly from the dispersion curve, provided either that the nitrogen atom is not protonated, or that the compound contains a chromophore absorbing above 200 mμ.