Presented in this paper is a conceptual design by computer simulation of monopulse reflector antenna with dual-circularly polarized sum patterns and linearly azimuth elevation difference patterns, which can be called semi-dual antenna. The proposed consists five-element feed prime-focus parabolic reflector. novelty the consisting square waveguide channel radiator rectangular radiators. separati...

background: understanding the learning styles of medical students can drive the institutions to adapt instructional materials to enhance students’ learning of knowledge and skills. this study explored the learning styles of undergraduate medical students, comparing gender variations in terms of their significant preferences. materials and methods: a cross-sectional observational study was perfo...

We analyze the polarization properties of the tilted off-axis dual-reflector submillimeter-wave telescope on the ESA PLANCK Surveyor designed for measuring the temperature anisotropies and polarization characteristics of the cosmic microwave background.

A dual-polarized Ka-band feed based on gap waveguide (GW) technology for an ultra-high-gain reflector antenna is presented. The provides SUM-beams data transfer and DIFF-beams tracking. whole composed of the a dual-reflector Cassegraine antenna. has been prototyped, measured reflection coefficients horizontally vertically polarized SUM-beam ports are below -10 dB -8 over 30.8-38 GHz, respective...

The submillimeter antennas of the Atacama Large Millimeter Array (ALMA) have specifications that are beyond the current state of the art in accurate reflector antenna technology. Considering that as many as 64 of these antennas would eventually be needed, the ALMA partners AUI/NRAO and ESO each agreed to acquire a prototype antenna, and subject these to an extensive evaluation program. In this ...

A W-band dual-polarized Cassegrain antenna for cloud radar is proposed. The aperture diameter of the main reflector of the antenna is 50 cm. By using a modified Magic-T structure in the feed horn, the antenna is dual-polarized with high port isolation. The measured results show that the port isolation is 44.7 dB. The gains are 47.3 dB and 49.5 dB for the two ports at 94GHz, respectively, and th...

Conclusion: It is possible to produce a very simple dual feed horn by cutting off a part of one side of a corrugated horn and fitting two of them together. A common ridge between both horns and, at least, one complete slot in each horn part is necessary to decouple them suficiently. The horn can be used for orthogonal polarisations with good cross-polar performance over a frequency band of abou...