Abstract
In this article, a design of planar cavity-backed antenna-triplexer is proposed for WLAN/WiMAX/ISM band at 5.2/5.5/5.8 GHz. The substrate integrated waveguide (SIW) technology is employed to realize a planar cavity-backed antenna-triplexer. The proposed geometry entails two SIW cavity resonators where a bowtie-shaped smaller cavity is inserted inside the larger rectangular one. The rectangular cavity consists of two bent-transverse slots those are excited by two different microstrip feedlines and the Bowtie-like slot inside the Bowtie cavity, excited by a coaxial feed. The antenna generates three different resonances at 5.2, 5.5, and 5.8 GHz simultaneously with flat gain characteristics. By exciting cavity modes (TE110) by Port2/Port3 and a patch mode (TM010) by Port 1 simultaneously, average isolation of better than 23 dB is accomplished among the three input ports. To validate the proposed idea, the design is fabricated and experimentally tested. The measured responses show a good matching with the simulations. Moreover, the antenna shows front to back ratio better than 18 dB and simulated gain values of 7, 5.45, 4.75 dBi at the three resonances.
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