Novel Circularly Polarized Substrate Integrated Waveguide SLOT Antanna



Circularly-polarized antenna is built based on a new SIW (substrate integrated waveguide)
structure which contains cavity-backed resonator and a conventional polarized ring with two
square slits in inner and outer ring that differ 90° at position and is proposed for right-handed
circular polarization (RHCP) and fabricated in two separate layers. A broadband impedance
bandwidth of 13.9% and a RHCP axial ratio of 0.5GHz have been obtained under the condition
of less than VSWR ≤2 and axial ratio≤ 3 dB, respectively


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