Patent ID: 9692137
Date: 2017-06-27
CPC Classifications: H01Q

Claim:
1. An annular slot antenna for use with a coaxial feed line having an inner feed line conductor and an outer feed line conductor, wherein the annular slot antenna is axially symmetric with respect to a center line of the inner feed line conductor, the antenna comprising: an inner conductor; a outer wall, which surrounds the inner conductor; a front plate having a circumferential annular slot; and a rear plate, which is opposite to the front plate, wherein front plate and rear plate are connected by the inner conductor, and wherein a cavity is formed by the front plate, rear plate, and the outer wall, wherein a dielectric gap is disposed in a portion of the inner conductor and extends across an entire diameter of said portion such that the inner conductor is divided by the dielectric gap into a rear section disposed towards the rear plate and a front section disposed towards the front plate, wherein the rear plate and the inner conductor enable the coaxial feed line to contact the annular slot antenna centrally via the rear plate such that the inner feed line conductor contacts the front section of the inner conductor, and the outer feed line conductor contacts the rear section, and wherein the inner conductor has a stepped construction such that a diameter of the inner conductor increases in a direction towards the rear plate in a stepped manner.