An SIW antenna utilizing odd-mode spoof surface plasmon polaritons for broadside radiation

In this article, a substrate integrated waveguide (SIW) antenna utilizing odd-mode spoof surface plasmon polariton (SSPP) for broadside radiation is proposed. Double gratings are etched on the top surface of SIW and the SSPP odd-mode is excited on this hybrid SIW-SSPP structure. The proposed SIW antenna has open-circuit termination and can realize broadside radiation. A prototype of the SIW-based odd-mode antenna is fabricated. Reasonable accordance is achieved between measured results and simulated results. The antenna impedance bandwidth is about 5.5% (12.4 similar to 13.1 GHz) with |S-11| < -10 dB. Stable broadside radiation is also realized within the operating band of 12.3 similar to 13.3 GHz and the measured gain varies from 5.66 to 6.34 dB in the frequency band. The proposed broadside radiation antenna is suitable for wireless communication systems due to its compact structure and good radiation performances.