Dual-band circularly polarized microstrip-fed shorted ring-slot rectenna

A dual-band circularly polarized (CP) microstrip-fed shorted ring-slot rectenna (rectifying antenna) was designed and its reception performance from both broadside directions was measured and compared at 2.45 GHz and 5.8 GHz ISM bands. CP performance at the lower frequency band was very similar for both directions of reception whereas considerable deviation was detected at the higher frequency band.