Dual-band circularly polarized microstrip antenna with two isolated outputs suitable for navigation systems

The geometry and numerical results of a dual-band circularly polarized microstrip antenna with two isolated outputs have been presented in this paper. Good return loss has been obtained for both frequency bands. Moreover, a gain response with a strong suppression in the frequency range located between both Galileo bands has been achieved. Due to its high level of integration and high of out-of-band frequencies, this antenna is a good option for the implementation of an array for a Safety-of-Life receiver. Furthermore, the wide radiation pattern of the designed element in both bands allows steering the beam down to low elevation angles, thus making the array capable of receiving signals coming from satellites flying near the horizon.