[asapmembers] TODAY: Thurs., Dec. 9th 12 pm ET: ASAP Lecture/Discussion "REFLECTARRAYS 101: A NON-EXPERT REVIEW AND POTENTIAL APPLICATIONS FOR THE NEW AO FACILITY"

Thu Dec 9 15:01:57 UTC 2021

Dear Colleagues,
	Lecture/Discussion: TODAY December, 12 noon ET
	REFLECTARRAYS 101: A NON-EXPERT REVIEW AND POTENTIAL APPLICATIONS FOR THE NEW AO FACILITY
	Prof. Luca Olmi, INAF — Arcetri Astrophysical Observatory
			(A fuller biography is given below)
	Host:  Prof. Héctor Arce
	Please see the zoom link below

Abstract:
	Abstract:  Since the revolutionary breakthrough of printed antenna technology, microstrip reflectarrays 
	have emerged as a new generation of high-gain antennas, combining many favorable features of both 
	reflectors and printed arrays as well as offering an alternative design with low-mass and low-cost features.  
	The aperture of a reflectarray antenna consists of elements arranged in a certain grid that are designed 
	to collimate the main beam of the antenna by controlling the phase of the reflected wave. A prominent 
	advantage of reflectarrays over reflectors is the direct phase control over every element on the aperture, 
	which allows shaped-beam or multibeam performance to be realized easily at no additional cost. Thus, 
	due to its hybrid nature, the reflectarray antenna provides advantages over reflectors and phased-arrays. 
	Despite all the above mentioned benefits, reflectarrays are usually characterized by narrow operating 
	bandwidths, caused by the intrinsic narrow-band of microstrip radiators and the differential spatial phase 
	delays from the feed to the reflecting elements. Improved bandwidths up to 19% have been demonstrated 
	in several designs, but most existing active configurations are characterized by few percent bandwidths. 
	In my talk I will review the main operating features of reflectarrays and will suggest some of their potential 
	areas of application in view of the design of the new AO facility.

This event is a further in the series of ASAP “lunchtime” talks/discussions exploring issues and proposals pertinent 
to Arecibo’s future.  Recordings of the earlier talks can be found on the areciboscience.org <http://areciboscience.org/> website.

	Please reserve the date, and note the zoom link immediately below.
		Best regards and wishes,
			ASAP Secretary

> Topic: Luca Olmi: Reflectarrays 101: A Non-expert Review and Potential Application for the New AO Facility
> Time: Dec 9, 2021 Noon Eastern Time (US and Canada)
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> Luca Olmi was born in Florence, Italy, in 1961. He received 
> the Physics degree and the Ph.D. in Astronomy from the University 
> of Florence in 1987 and 1992, respectively.
> From 1993 to 1996 he was a Cornell University Research Associate
> with the Arecibo Observatory in Puerto Rico. From 1996 to 2001 he
> was a Senior Research Associate with the Astronomy Department 
> of the University of Massachusetts at Amherst, where he worked on
> the Large Millimeter Telescope (LMT). From 1999 to
> 2010 he was part of the international collaboration BLAST
> (Balloon-borne Large Aperture Sub-millimeter Telescope). 
> Since 2001 he has been an Astronomer and Technologist with
> the “Istituto Nazionale di Astrofisica” (INAF) in Italy, at
> the Arcetri Astrophysical Observatory. From 2005 to 2017 he also
> jointly held a faculty position at the University of Puerto Rico, 
> Rio Piedras campus. 
> His research interests include the observation and analysis of 
> molecular clouds and star forming regions, the effects of the 
> atmosphere on radio astronomical observations, optical and EM 
> design applied to radio telescopes and associated instrumentation, 
> novel instrumentation design for radio telescopes.
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