Patent ID: 7928923
Filing Date: 2011-04-19
Classification: H01Q,Y10T

Abstract:
1. An antenna apparatus that operates in millimeter waveband or microwave band, the antenna apparatus comprising: a ground conductor; a transmitting antenna arranged on the ground conductor and connected to a first feed line; a receiving antenna arranged on the ground conductor and connected to a second feed line; and one or more chokes that are arranged on the ground conductor between the transmitting antenna and the receiving antenna, and are operative to suppress an electromagnetic coupling between the transmitting antenna and the receiving antenna, wherein is all of the one or more chokes are in a form of a groove which has a bottom surface at a depth below an opening in the ground conductor, and the depth of the bottom surface is in a range from 0.15λ to less than 0.225λ, where λ is a wavelength of a carrier wave of the transmitting antenna.