A Novel Millimeter‐Wave Circularly‐Polarized SIW Slot Antenna Array

Le résumé fourni par la source

ABSTRACT Millimeter‐wave circularly‐polarized substrate integrated waveguide (SIW) slot antennas using novel resonant modes are proposed in this paper. Unlike conventional circularly polarized SIW slot antennas, the proposed circularly polarized slot antenna employs two novel SIW TE 101 and TE 011 cavity modes, with the electric field oriented parallel to the metal plane. The resonant frequencies of TE 101 and TE 011 modes in SIW cavity are mainly determined by the cavity height. Consequently, they have high resonant frequencies, demonstrating good feasibility for designing millimeter‐wave circularly‐polarized slot antennas. Additionally, the radiation slots on the top metal plane are excited by the electric field of the cavity modes, which eliminates the need of power dividing network for feeding the array elements, thereby simplifying the antenna feeding structure. A 4×4 millimeter‐wave circularly polarized SIW slot array is then designed and analyzed. The final results show that the proposed antenna can achieve 3.24% operation bandwidth, 12.19 dBic peak gain, and higher than 90% total efficiency.

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