Patent ID: 8503951

Claim:
An antenna installation method in a radio communication system that is configured and arranged to transmit different signals from a plurality of antennas of a second communication apparatus using the same frequency band and receives the signals by a plurality of antennas of a first communication apparatus, the antennas of said first communication apparatus including at least first and second antennas, the antennas of said second communication apparatus including at least first and second antennas, the first communication apparatus being arranged between the first and second antennas of said second communication apparatus, the antenna installation method comprising: setting an angle formed by a first line connecting said first communication apparatus and said first antenna of said second communication apparatus and a second line connecting said first communication apparatus and said second antenna of said second communication apparatus to be equal to or smaller than 180 degrees; and setting a first distance between said first communication apparatus and said first antenna of said second communication apparatus and a second distance between said first communication apparatus and said second antenna of said second communication apparatus to be specified values determined by a signal wavelength and said angle formed by said first line and said second line, respectively, wherein, when said angle formed by said first line and said second line is smaller than 180 degrees, an intersection point between said first line and said second line, said first antenna of said first communication apparatus, and said second antenna of said first communication apparatus are arranged to form an isosceles triangle, and wherein a distance between said first and second antennas of said first communication apparatus is determined by a formula d = ( 1 / 4 + N ) ⁢ λ Sin ⁡ ( θ / 2 ) where d is the distance, N is an integer equal to or larger than zero, λ is the signal wavelength, and θ is the angle formed by said first line and said second line.