Does a parabolic reflector dish change circular polarity?

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I've been receiving satellite signals in the L-band (~1.7GHz), recently.



These signals are RHCP. So far, I've been using a DIY helical antenna in axial mode, and a patch antenna with cropped or clipped corners.



My favorite tool to calculate the latter, is btw. this: http://kempbros.github.io/antennas/Patch_Antenna_Generator/



Anyway, when a signal is RHCP, I need an RHCP antenna to receive it, that's quite logical, and I can visualise in my head, how the propagation works, etc.



But now I'd like to use a dish as a reflector, but as I imagine things, the reflector works like a mirror, and will change the polarity of the circular polarized signal. So to receive a RHCP signal with a parabolic dish antenna (receiving element pointed at the dish, similar to how the LNB is mounted on a Ku-band antenna for satellite TV), I'd need a LHCP antenna in the focal point of the dish.



At least that's how I understand it, but like I said, at this point I'm super confused.






antenna-theory circular-polarization reflector







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    up vote
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    down vote

    favorite












    I've been receiving satellite signals in the L-band (~1.7GHz), recently.



    These signals are RHCP. So far, I've been using a DIY helical antenna in axial mode, and a patch antenna with cropped or clipped corners.



    My favorite tool to calculate the latter, is btw. this: http://kempbros.github.io/antennas/Patch_Antenna_Generator/



    Anyway, when a signal is RHCP, I need an RHCP antenna to receive it, that's quite logical, and I can visualise in my head, how the propagation works, etc.



    But now I'd like to use a dish as a reflector, but as I imagine things, the reflector works like a mirror, and will change the polarity of the circular polarized signal. So to receive a RHCP signal with a parabolic dish antenna (receiving element pointed at the dish, similar to how the LNB is mounted on a Ku-band antenna for satellite TV), I'd need a LHCP antenna in the focal point of the dish.



    At least that's how I understand it, but like I said, at this point I'm super confused.






    antenna-theory circular-polarization reflector







    share|improve this question























      up vote
      1
      down vote

      favorite









      up vote
      1
      down vote

      favorite











      I've been receiving satellite signals in the L-band (~1.7GHz), recently.



      These signals are RHCP. So far, I've been using a DIY helical antenna in axial mode, and a patch antenna with cropped or clipped corners.



      My favorite tool to calculate the latter, is btw. this: http://kempbros.github.io/antennas/Patch_Antenna_Generator/



      Anyway, when a signal is RHCP, I need an RHCP antenna to receive it, that's quite logical, and I can visualise in my head, how the propagation works, etc.



      But now I'd like to use a dish as a reflector, but as I imagine things, the reflector works like a mirror, and will change the polarity of the circular polarized signal. So to receive a RHCP signal with a parabolic dish antenna (receiving element pointed at the dish, similar to how the LNB is mounted on a Ku-band antenna for satellite TV), I'd need a LHCP antenna in the focal point of the dish.



      At least that's how I understand it, but like I said, at this point I'm super confused.






      antenna-theory circular-polarization reflector







      share|improve this question













      I've been receiving satellite signals in the L-band (~1.7GHz), recently.



      These signals are RHCP. So far, I've been using a DIY helical antenna in axial mode, and a patch antenna with cropped or clipped corners.



      My favorite tool to calculate the latter, is btw. this: http://kempbros.github.io/antennas/Patch_Antenna_Generator/



      Anyway, when a signal is RHCP, I need an RHCP antenna to receive it, that's quite logical, and I can visualise in my head, how the propagation works, etc.



      But now I'd like to use a dish as a reflector, but as I imagine things, the reflector works like a mirror, and will change the polarity of the circular polarized signal. So to receive a RHCP signal with a parabolic dish antenna (receiving element pointed at the dish, similar to how the LNB is mounted on a Ku-band antenna for satellite TV), I'd need a LHCP antenna in the focal point of the dish.



      At least that's how I understand it, but like I said, at this point I'm super confused.






      antenna-theory circular-polarization reflector




      antenna-theory circular-polarization reflector






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      asked 3 hours ago









      polemon

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          A parabolic reflector reverses the sense of circular polarization. so your feed must have the opposite sense or "handedness" to the incoming signal to avoid significant polarization loss.






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            A parabolic reflector reverses the sense of circular polarization. so your feed must have the opposite sense or "handedness" to the incoming signal to avoid significant polarization loss.






            share|improve this answer
























              up vote
              3
              down vote



              accepted










              A parabolic reflector reverses the sense of circular polarization. so your feed must have the opposite sense or "handedness" to the incoming signal to avoid significant polarization loss.






              share|improve this answer






















                up vote
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                down vote



                accepted







                up vote
                3
                down vote



                accepted






                A parabolic reflector reverses the sense of circular polarization. so your feed must have the opposite sense or "handedness" to the incoming signal to avoid significant polarization loss.






                share|improve this answer












                A parabolic reflector reverses the sense of circular polarization. so your feed must have the opposite sense or "handedness" to the incoming signal to avoid significant polarization loss.







                share|improve this answer












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                answered 2 hours ago









                Brian K1LI

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