Paper 13102-53
Paper 13102-53
Innovative octave band quad ridge feed horn and vacuum window for next-generation radio observatories
On demand | Presented live 21 June 2024 
Abstract
In the effort to push the boundaries of radio astronomy observations, technological innovations are essential for future generations of observatories. This paper introduces an innovative design for future radio receivers in major observatories like ngVLA, ALMA, and SKA. The concept centers around an Octave Band Quad Ridge Feed Horn and Vacuum Window, designed to operate within the 25 to 50 GHz (2:1) frequency range. This cutting-edge feed model uses dielectric loading to enhance phase and polarization efficiency, thereby significantly increasing the overall aperture efficiency across the bandwidth. The dielectric rod, features a solid construction with comb-shaped ridges located in the throat of the feed horn. To complete the entire optic model an HDPE vacuum window with three custom designed antireflection layers to minimize the signal reflections, is designed and presented. To confirm the performance of the proposed model, we use two different 3D full-wave electromagnetic simulators, CST Studio Suite and HFSS. The results showcase a return loss exceeding 25dB with exceptional beam symmetry across the entire bandwidth.
Presenter
NRC-Herzberg Astronomy & Astrophysics (Canada)
Dr. Sara Salem earned her Ph.D. from the Department of Electrical and Computer Engineering at the University of Victoria, BC, Canada. Her doctoral research focused on the design and development of Substrate Integrated Waveguide antenna systems. During her Ph.D. studies, she received numerous accolades, including a nomination for the Governor General’s Gold Medal and the Outstanding Graduate Student Research Award. Since completing her Ph.D., Dr. Salem has served as a research officer at the National Research Council Canada Herzberg Astronomy and Astrophysics Research Center. Her current role involves leading the design and development of Band-5 single-pixel cryogenic receiver for the ngVLA telescope. Her responsibilities extend to the design and development of various octave-band components, including quad-ridge feed horns, vacuum windows, and other mm-wave components. In addition to her research role, Dr. Salem holds the position of adjunct professor at the University of Victoria.