Patent ID: 11921225
Assignee: SEESCAN, INC.
Field: Telecommunications (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 12:
13. An antenna system, comprising:
an antenna array having multiple antenna elements generating input signals successively 90 degrees out of phase such that the input signals have a relative phase of zero, 90, 180, and 270 degrees;
an impedance matching network coupled to the antenna array such that the impedance of the input signals at each antenna element matches that of the other antenna elements;
a pair of 90 degree phase shifting elements wherein each phase shifting element is coupled to a pair of antenna elements in the antenna array to receive their associate input signals, shift the phase on one signal 90 degree to match that of its paired antenna element's signal, and output a combined signal 180 degree out of phase to that of the output signal of the other 90 degree phase shifting element;
a low noise amplifier coupled to each 90 degree phase shifting element to amplify the combined output signal and isolate impedance differences in the 180 degree out of phase output signals;
a first transformer element comprising a first inductor coupled to both low noise amplifiers that outputs right-hand circularly polarized signals at a second inductor; and
a second transformer element comprising a first inductor and a second transformer wherein the first inductor is center tapped off the first inductor of the first transformer element and takes common mode signals and outputs left-hand circularly polarized signals at the second inductor.