+ Post New Thread
Results 1 to 5 of 5
  1. #1
    Full Member level 2
    Points: 910, Level: 6

    Join Date
    Oct 2017
    Posts
    126
    Helped
    16 / 16
    Points
    910
    Level
    6

    Is it really "heating" used for beam scanning in Echodyne's radar?

    The metamaterial used in the radar system exists in the form of an antenna that actually changes its physical shape to steer the radar beam that it emits—a necessity for tracking moving objects. The change comes about by heating different parts of the antenna, which is made of multiple layers of copper wiring laid down on a circuit board in a very precise way. Testing has shown the radar system capable of spotting small aircraft as far away as 1.8 miles within a 120-degree field of view.
    Is it really heating or just a misinterpretation?

    reference:

    https://techxplore.com/news/2016-11-...zed-radar.html

    •   AltAdvertisement

        
       

  2. #2
    Advanced Member level 4
    Points: 9,761, Level: 23
    FoxyRick's Avatar
    Join Date
    Jan 2004
    Location
    England, UK
    Posts
    1,248
    Helped
    324 / 324
    Points
    9,761
    Level
    23

    Re: Is it really "heating" used for beam scanning in Echodyne's radar?

    Yes, it really uses heating to shape the beam, replacing a phased array method. More information here:

    https://spectrum.ieee.org/automaton/...ry-drones-need
    If I helped you, press the 'Helped Me' button. Please do not PM me with questions, unless it is a personal matter.



    •   AltAdvertisement

        
       

  3. #3
    Advanced Member level 5
    Points: 33,591, Level: 44

    Join Date
    Oct 2001
    Posts
    4,799
    Helped
    1420 / 1420
    Points
    33,591
    Level
    44

    Re: Is it really "heating" used for beam scanning in Echodyne's radar?

    "...Echodyne, a Seattle-area startup backed by investors that include Bill Gates and Paul Allen, announced that it was working on a new type of radar about the size of a cellphone with performance that’s much more like the fancy phased-array radars that the military uses while costing a tenth as much or less..."

    Always I had doubts in getting good REAL performances of metamaterial antennas, but these guys looks they found one good milking cow...or more



    •   AltAdvertisement

        
       

  4. #4
    Full Member level 2
    Points: 910, Level: 6

    Join Date
    Oct 2017
    Posts
    126
    Helped
    16 / 16
    Points
    910
    Level
    6

    Re: Is it really "heating" used for beam scanning in Echodyne's radar?

    radar array is made of multiple layers of carefully patterned copper wiring, and beam control results from heating specific areas of the wiring...
    Searched for "heater phase shifter" and found some papers, for example: http://orbit.dtu.dk/files/4359773/Pu.pdf
    The tuning operations of our devices are performed by electrical current through integrated heaters, instead of optical power adopted in [8]. This would be a much more practical implementation of such a phase shifter in real applications
    Interesting if something similar could be done on a substrate with large Er(t) dependency. Some current may be applied to thin high impedance lines and provide some phase shift.



  5. #5
    Advanced Member level 5
    Points: 34,203, Level: 45

    Join Date
    Dec 2004
    Location
    New England, USA
    Posts
    4,808
    Helped
    1347 / 1347
    Points
    34,203
    Level
    45

    Re: Is it really "heating" used for beam scanning in Echodyne's radar?

    It looks like a multi element phased array, where the elements are spaced out electrically with different time delays. As you sweep the frequency, each time delay imparts a different phase shift, so you can scan the antenna from left to right.

    It is a very old concept, radars in the 1950's used this, albeit with metal waveguides providing the time delay elements.



--[[ ]]--