Wireless communication device and wireless communication method
A wireless communication device is presented. The wireless communication device includes: a high-frequency circuit; and an analog signal processing circuit that performs gain adjustment such that a gain for each of the plurality of antenna elements, in case of a signal transmission or in case of a signal reception, is a predetermined value being dependent on a position of the antenna element. The analog signal processing circuit includes a first splitter/combiner between the high-frequency circuit and the plurality of antenna elements. For each antenna element in the plurality of antenna elements, a second splitter/combiner is coupled to a particular antenna element in the plurality of antenna elements and, for each antenna element in the plurality of antenna elements, two or more phase shifters of a given M system are connected in parallel with each other and coupled between the first splitter/combiner and a corresponding second splitter/combiner.
1. A wireless communication device having a plurality of antenna elements, the wireless communication device comprising:
a high-frequency circuit configured to perform signal processing including frequency conversion between a signal in a radio frequency band and a signal in a baseband band or an intermediate frequency band; and
an analog signal processing circuit configured to perform gain adjustment through analog signal processing by using a phase shifter such that a gain for each of the plurality of antenna elements, in case of a signal transmission or in case of a signal reception, is a predetermined value being dependent on a position of a given antenna element,
wherein the analog signal processing circuit includes
a first splitter/combiner configured to establish 1-to-(N×M) connection by performing splitting or combining between the high-frequency circuit and the plurality of antenna elements for an integer N of 2 or more corresponding to a number of antenna elements and an integer M of two or more,
for each antenna element in the plurality of antenna elements, a second splitter/combiner is coupled to a particular antenna element in the plurality of antenna elements and performs 1-to-M splitting or combining, and
for each antenna element in the plurality of antenna elements, two or more phase shifters of a given M system connected in parallel with each other and coupled between the first splitter/combiner and a corresponding second splitter/combiner,
wherein a direction of a directional beam formed when one phase shifter among the two or more phase shifters of the given M systems for each of the plurality of antenna elements is combined for all of the plurality of antenna elements in a vicinity of an azimuth of a target to which a directivity is to be directed and is pointing in a direction that is different from the azimuth of the target, and an average of directions of M kinds of formed directional beams is set to be a direction of the azimuth of the target to which the directivity is to be directed.
2. The wireless communication device according to claim 1 ,
wherein an amplitude of the given antenna element at a distance d from a center of the given antenna is set to be proportional to 2×{Cos (2πdΔθ/λ)} for predetermined Δθ.