US 12,322,872 B2
Feeding network device for improved direction estimation
Soo Chang Chae, Seongnam-si (KR); Ki Jin Kim, Hwaseong-si (KR); and Kwang Ho Ahn, Yongin-si (KR)
Assigned to Korea Electronics Technology Institute, Seongnam-si (KR)
Filed by Korea Electronics Technology Institute, Seongnam-si (KR)
Filed on Dec. 2, 2022, as Appl. No. 18/073,720.
Claims priority of application No. 10-2021-0177549 (KR), filed on Dec. 13, 2021.
Prior Publication US 2023/0187825 A1, Jun. 15, 2023
Int. Cl. H01Q 3/36 (2006.01); G01S 13/44 (2006.01)
CPC H01Q 3/36 (2013.01) [G01S 13/4463 (2013.01)] 8 Claims
OG exemplary drawing
 
8. A radar device comprising:
a first coupler configured to convert a first input signal inputted through a first input port into two output signals having a 90-degree phase difference and to output the signals, and to convert a second input signal inputted through a second input port into two output signals having a 90-degree phase difference and to output the signals;
a second coupler configured to convert a third input signal inputted through a third input port into two output signals having a 90-degree phase difference and to output the signals, and to convert a fourth input signal inputted through a fourth input port into two output signals having a 90-degree phase difference and to output the signals;
a first delay configured to delay a second output signal of the first coupler;
a second delay configured to delay a second output signal of the second coupler;
a third coupler configured to convert a first output signal of the first coupler into two output signals having a 90-degree phase difference and to output the signals, and to convert a first output signal of the second coupler into two output signals having a 90-degree phase difference;
a fourth coupler configured to convert an output signal of the first delay into two output signals having a 90-degree phase difference and to output the signals, and to convert an output signal of the second delay into two output signals having a 90-degree phase difference and to output the signals;
a third delay configured to delay a first output signal of the third coupler;
a first output port configured to output an output signal of the third delay;
a second output port configured to output a second output signal of the third coupler;
a fourth delay configured to delay a first output signal of the fourth coupler;
a third output port configured to output an output signal of the fourth delay;
a fourth output port configured to output a second output signal of the fourth coupler; and
an array antenna which comprises antennas connected to the first output port, the second output port, the third output port, and the fourth output port, respectively.