Antenna device and method for reducing grating lobe
AssigneeMitsubishi Electric Corporation
InventorsTakashi MARUYAMA, Satoshi YAMAGUCHI, Masataka OTSUKA, Naoyuki YAMAMOTO
Life of this patent
Estimating the term…
Abstract
A signal combiner (33) specifies a weighting coefficient w for suppressing a grating lobe included in a composite signal S3 obtained when combining a digital received signal S1 and digital received signal S2 stored by a signal calculation storage (31), from the gain in a grating lobe direction in a first radiation pattern and the gain in a grating lobe direction in a second radiation pattern, and combines the digital received signal S1 and digital received signal S2 stored by the signal calculation storage (31) using the weighting coefficient w.
Claims13
An antenna device comprising:
- an array antenna including a plurality of element antennas which are configured to allow for switching among radiation patterns;
- a radiation pattern controller to change radiation patterns of the plurality of element antennas thereby to set a radiation pattern of the array antenna;
- a signal detector to detect a received signal of the array antenna each time the radiation pattern of the array antenna is newly set by the radiation pattern controller;
- and
- a signal processor to specify one or more weighting coefficients for suppressing a grating lobe included in a composite signal obtained when combining received signals detected by the signal detector when respective radiation patterns of the array antenna are set, from gains in a grating lobe direction in radiation patterns of the array antenna which are set by the radiation pattern controller, and to combine the received signals detected by the signal detector when the respective radiation patterns of the array antenna are set, by using the one or more weighting coefficients.
A method for reducing a grating lobe, comprising:
- in a radiation pattern controller, changing radiation patterns of plurality of element antennas which are configured to allow for switching among radiation patterns, thereby to set a radiation pattern of an array antenna including the plurality of element antennas;
- in a signal detector, detecting a received signal of the array antenna each time the radiation pattern of the array antenna is newly set by the radiation pattern controller;
- and
- in a signal processor, specifying one or more weighting coefficients for suppressing a grating lobe included in a composite signal obtained when combining received signals detected by the signal detector when respective radiation patterns of the array antenna are set, from gains in a grating lobe direction in radiation patterns of the array antenna set by the radiation pattern controller, and combining the received signals detected by the signal detector when the respective radiation patterns of the array antenna are set, by using the one or more weighting coefficients.
Dependencies are inferred from the claim text.