A radar transceiver (10) operating with shapes circular polarized wave, uses a single circularly polarized antenna (17) for transmitting and receiving circularly polarized waveforms. A directional 3 dB coupler (15) splits the signal to be transmitted into two signals dephased by 90 ° for the transmission by the antenna (17) and also combines the horizontal and vertical components of any feedback signal. The antenna (17) consists of microstrip antenna arrays bed linearly polarized (21) and (22) being mounted on a single substrate along the transceiver.
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