Transmission polarizer

H - Electricity – 01 – Q

Patent

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Details

H01Q 15/24 (2006.01) H01Q 1/38 (2006.01) H01Q 3/46 (2006.01) H01Q 15/22 (2006.01) H01Q 19/185 (2006.01) H01Q 19/195 (2006.01)

Patent

CA 2279262

The invention relates to a device for changing the polarization of an incident electromagnetic wave. Existing devices to change the polarization of an incident electromagnetic wave preserve signal decoupling, i.e. the relation between useful polarization and cross-polarization of the incoming signal. Furthermore, said devices are far too big for many applications. The aim of the inventive device is to improve signal decoupling. During transmission of an electromagnetic wave through the transmission polarizer, the cross-coupled fraction of an incoming signal is greatly reflected thus leading to improved decoupling of the transmitted signal. Furthermore, the transmission polarizer can be manufactured in the form of a single planar printed board. The transmission polarizer is particularly useful to change the polarization of an incident electromagnetic wave, i.e. from linear to circular polarization or vice versa, and to rotate the polarization of an incident electromagnetic wave around a fixed angle.

L'invention concerne un dispositif de variation de la polarisation d'une onde électromagnétique incidente. Les dispositifs connus de ce type conservent le découplage d'un signal, c'est-à-dire le rapport entre la polarisation utile et la polarisation croisée du signal d'entrée. En outre, pour bon nombre d'applications, ils présentent de trop grandes dimensions. Le nouveau dispositif a pour but d'améliorer le découplage du signal. Lors de la transmission d'une onde électromagnétique à travers le polariseur à transmission, la fraction à polarisation circulaire croisée d'un signal incident est largement réfléchie, ce qui a pour conséquence que le découplage du signal transmis est sensiblement amélioré. En outre, le polariseur à transmission peut simplement être réalisé sous la forme d'une unique plaquette plane de circuit imprimé. Le polariseur à transmission est utilisé pour faire varier la polarisation d'une onde électromagnétique incidente, à savoir, pour passer d'une polarisation linéaire à une polarisation circulaire ou inversement, ainsi que pour faire tourner d'un angle fixe la polarisation d'une onde électromagnétique incidente.

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