A Single-Layer Filtering Slot Antenna Based on Circular SIW Cavity.

A low profile and high selectivity filtering slot antenna based on circular substrate integrated waveguide (SIW) cavity is presented. The proposed antenna is originated from a circular SIW cavity operating at its TM010 mode. A cruciform slot is integrated on the top surface of the cavity, and the cavity is then split into four quarter-mode cavity resonators. In this aspect, the four similar quarter-TM010 modes will be generated by the compact structure. By amalgamating four similar modes into a single-band, the bandwidth of antenna is widened. Based on the structure, a filtering slot antenna with central frequency of 8 GHz and bandwidth of 5.6% is designed and fabricated. Measured results agree well with the simulated ones. In addition, two radiation nulls are produced at the edges of the passband, and the selectivity in the transition band is enhanced greatly. [ABSTRACT FROM AUTHOR]