A method is described for designing high-efficiency rectangular horns that results in more compact horns than those obtained by using conventional linear tapers or steps. Results are presented for horns suitable for array feed or directly radiating array applications that show an aperture efficiency greater than 90% can be achieved over a 5% bandwidth with horns of aperture size ranging from 1....

Zinc has been discussed as a feed additive to improve hoof horn quality and skin diseases. Hooves of good quality contain more zinc than hooves of poor quality (1). Because zinc supplementation seems to increase the zinc content of the hoof (1), the bioavailability of different zinc compounds became potentially important. In the present investigation the serum response after oral supplementatio...

Series feeds are commonly used in antenna arrays because of their compact size and low loss compared to corporate but typically feature beam squint over wide bandwidths. This work proposes a series-fed waveguide horn array with reduced by introducing synthesized time delay sections between the horns feed line. The array, implemented WR42 waveguide, achieves 1.53° 4 GHz operating band, 10.52° fo...

Automatically verifying safety properties of programs is hard, and it is even harder if the program acts upon arrays or other forms of maps. Many approaches exist for verifying programs operating upon Boolean and integer values (e.g. abstract interpretation, counterexample-guided abstraction refinement using interpolants), but transposing them to array properties has been fraught with difficult...

This study was performed to evaluate the efficacy of injection of essential oil of Eugenia caryophyllata in the kid horn buds, as a new chemical technique for disbudding. Five-day-old healthy goat kids from both sexes (n = 16) were divided randomly into 4 equal groups. In groups 1, 2 and 3, 0.2 mL of clove essence and in group 4 (control) 0.2 mL of normal saline was injected into the l...

The science goals of the SKA specify a field of view which is far greater than what current radio telescopes provide. Two possible feed architectures for reflector antennas are clusters of horns or phased-array feeds. This memo compares these two alternatives and finds that the beams produced by horn clusters fall short of fully sampling the sky and require interleaved pointings, whereas phased...

The 440-Mcps conical-scan tracker at the Millstone Hill radar site has been converted to an L-band 12-horn monopulse tracker utilizing a Cassegrain optics reflector system. The amplitude sensing monopulse feed illuminates a 10-foot subreflector and thence an 84-foot-diameter paraboloid with linear or either sense of circular polarization. This system conversion increased the capabilities of the...

This paper presents the design and fabrication of a feed horn antenna integrated fix-tuned 380GHz sub-harmonically pumped mixer, based on planar GaAs air-bridged Schottky anti-parallel diode from Rutherford Appleton Laboratory. The diode was designed and fabricated by millimeter technology group, Rutherford Appleton Laboratory, UK. The mixer’s circuit configuration and cavity block are realized...

The paper explores an omnidirectional antenna configuration composed of a reflector fed by shaped dielectric lens associated with coaxial TEM horn. A simple formula describes the shape obtained applying Fermat’s principle to control rays’ caustic emerging from interface. Based on geometrical optics (GO) principles, synthesis technique defines radiation pattern in vertical plane. Concatenated co...

A general multiobjective optimization and design procedure of a Luneberg lens antenna (LLA) with a compact multiband multi-polarized feed-system for a broadband satellite communication terminal is presented. The LLA utilizes a compact multiband feed horn, consisting of an inner dielectric loaded circular horn for the K/Ka-band (dual-circular polarization) and a coaxial waveguide with axially co...