A Reactively Coupled Bi-Directional Dual CP Antenna

This paper presents the design of a bi-directional, dual CP antenna at S band. It is a two layer structure and reactive coupling is used to excite the antenna. This antenna provides a bandwidth of 100 MHz, a maximum gain of 6.2 dBic in the positive z direction and 4.84 dBic in the negative z direction at 2.27 GHz. It produces RHCP in the +z direction and LHCP in the –z direction. This antenna can find applications in situations where two orthogonal polarizations are required in two different directions. It can also be used for communication in tunnels and in corridors.