Active reconfigurable intelligent surface apparatus including a bidirectional signal modulator
AssigneeFoundation of Soongsil University-Industry Cooperation
InventorsJun Taek OH, Ji Su KIM
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Abstract
There is disclosed a bidirectional vector modulation apparatus capable of modulating vector signals transmitted in bidirectional directions. The disclosed bidirectional vector modulation apparatus includes four ports and operates using a signal separation/combination unit configured to change an input applied to each port by a predetermined gain and/or phase and to output the changed signal through another port. The bidirectional vector modulation apparatus according to an exemplary embodiment may be applied to a communication device or a radar device, and may be implemented in a compact and lightweight form by using a signal separation/combination unit having a simple structure.
Claims11
A vector modulation apparatus comprising:
- a first signal separation/combination unit configured to receive a first vector signal and to separate the first vector signal into a first signal vector and a first carrier vector;
- a first signal vector gain/phase adjustment unit configured to adjust a magnitude or a phase of the separated first signal vector;
- a first carrier vector gain/phase adjustment unit configured to adjust a magnitude or a phase of the separated first carrier vector;
- and
- a second signal separation/combination unit configured to combine the first signal vector whose magnitude or phase has been adjusted and the first carrier vector whose magnitude or phase has been adjusted, thereby generating a modulated first vector signal.
An active reconfigurable intelligent surface (RIS) apparatus comprising:
- a circularly polarized antenna configured to receive a left-hand circularly polarized signal or a right-hand circularly polarized signal and to generate two signals having a 90-degree phase difference;
- a signal separation/combination unit configured to receive the two signals having the 90-degree phase difference through a first port and a fourth port, and to combine the signals input to the first port and the fourth port to output, through one of a second port or a third port, a signal having a phase identical to one of the two signals;
- and
- a bidirectional phase/gain adjustment unit configured to receive the output signal and to modulate a phase and a gain of the received signal,
- wherein the signal whose phase and gain have been modulated is input to the signal separation/combination unit through one of the second port or the third port that does not output the combined signal,
- wherein the signal separation/combination unit is configured to separate the modulated signal into two signals having a 90-degree phase difference and to output the two signals through the first port and the fourth port,
- wherein, when the circularly polarized antenna receives the left-hand circularly polarized signal, the signals output through the first port and the fourth port are radiated as a right-hand circularly polarized signal via the circularly polarized antenna, and
- wherein, when the circularly polarized antenna receives the right-hand circularly polarized signal, the signals output through the first port and the fourth port are radiated as a left-hand circularly polarized signal via the circularly polarized antenna.
Dependencies are inferred from the claim text.