公开(公告)号：WO2020077234A1

公开(公告)日：2020-04-16

申请号：PCT/US2019/055889

申请日：2019-10-11

申请人： DENSO INTERNATIONAL AMERICA, INC. ,  DENSO CORPORATION

发明人： STITT, Raymond Michael ,  TOKUNAGA, Yuki

IPC分类号： G07C9/00 ,  B60R2325/108 ,  B60R2325/205 ,  B60R25/2072 ,  B60R25/241 ,  B60R25/245 ,  B60R25/246 ,  G01S11/02 ,  G01S13/765 ,  G01S13/767 ,  G01S13/84 ,  G01S5/0284 ,  G01S7/021 ,  G07C2009/00388 ,  G07C2009/00555 ,  G07C2209/61 ,  G07C2209/63 ,  G07C9/00309 ,  G07C9/00944 ,  G07C9/28 ,  H01Q1/3241 ,  H01Q1/3275 ,  H01Q13/10 ,  H01Q25/00 ,  H01Q25/04 ,  H01Q9/0435 ,  H01Q9/0464 ,  H01Q9/42 ,  H04B1/7073 ,  H04B17/318 ,  H04B7/0669 ,  H04B7/0691 ,  H04B7/10 ,  H04B7/15 ,  H04W12/08 ,  H04W12/122 ,  H04W12/128 ,  H04W12/63 ,  H04W4/023 ,  H04W4/40

摘要： A system for accessing or providing operational control of a vehicle includes initiator and sniffer devices. The initiator device includes: polarized antennas; a transmitter transmitting a first tone signal via the polarized antennas from the vehicle to a responder/portable access device; and receiver receiving a second tone signal from the responder device in response to the first tone signal. The sniffer device includes: second polarized antennas; and a second receiver receiving, via the second polarized antennas, the first tone signal from the transmitter and the second tone signal from the responder device. The sniffer device determines states of the first and second tone signals including respective phase delays. The initiator or sniffer device estimates a first distance from the vehicle to the responder device or a second distance from the responder device to the sniffer device based on the states including respective phase delays.

公开(公告)号：WO2021239776A1

公开(公告)日：2021-12-02

申请号：PCT/EP2021/063976

申请日：2021-05-26

申请人： REQUTECH AB

发明人： MARTIN, Torleif

IPC分类号： H01Q1/52 ,  H01Q9/04 ,  H01Q21/06 ,  H01Q21/24 ,  H01Q1/38 ,  H01Q21/065 ,  H01Q9/0435

摘要： A method for improving cross-polarization discrimination in a dual-polarized antenna array (100). The antenna array (100) comprises a plurality of antenna elements (110), each antenna element (110) comprising at least two feeding ports (101, 102) arranged to excite the antenna element with mutually independent signals having respective complex amplitudes. The method comprises determining (S1), for each of the feeding ports (101, 102) and for each antenna element (110), an electromagnetic far field resulting from excitation of the antenna element by the feeding port in terms of field components corresponding to two orthogonal linear polarizations and selecting (S2) a desired circular polarization in the far field to be either right-handed or left-handed circular polarization. The method also comprises determining (S3), based on a predetermined relationship between the field components corresponding to the two orthogonal linear polarizations and on the desired circular polarization in the far field, a ratio between the complex amplitudes of excitation of the feeding ports (101, 102) of each antenna element (110), wherein the ratio is associated with an increased cross-polarization discrimination, and exciting (S4) the antenna elements (110) with signals having complex amplitudes according to the determined ratio.

公开(公告)号：WO2021197400A1

公开(公告)日：2021-10-07

申请号：PCT/CN2021/084801

申请日：2021-04-01

申请人： STAR SYSTEMS INTERNATIONAL LIMITED

发明人： MAK, Chi Lun

IPC分类号： H01Q1/38 ,  H01Q21/065 ,  H01Q5/371 ,  H01Q9/0435 ,  H01Q9/0457 ,  H01Q9/0478

摘要： A patch antenna, comprising: a conductive element; and a first feed point; wherein the first feed point splits into at least two branches which are connected electrically to the conductive element. The two branches are configured such that a cross polarization in a H-plane is suppressed, and the antenna gain is increased compared to conventional patch antenna designs.