Design of a high gain self-triplexing directive antenna using SIW leaky wave technique

In this paper, a high gain self-triplexing antenna based on the substrate integrated waveguide (SIW) leaky wave technology is presented for tri-frequency operation. Three identical T-shaped slots are embedded on the upper layer of the proposed SIW antenna, which are energized by two tapered microstrip lines and a simple microstrip line; and the antenna resonates at three different frequencies (7.75 GHz, 9.1 GHz, and 10.15 GHz). The transverse part of the T-slot achieves the first band (8.8 to 9.3 GHz), while the longitudinal part of the T-slot achieves the second band (9.6 to 10.9 GHz), and when excited transversely, the T-slot achieves the third band (7.5 to 8.2 GHz). The isolation level between the ports is more than 25 dB, which contributes to the phenomenon of self-triplexing. The gain of the presented antenna is high when compared with other self-triplexing antennas. This paper presents a self-triplexing antenna with three T-shaped slots embedded on the top layer, ensuring that the radiation from each slot is in the same phase. In the proposed antenna, the substrate-integrated waveguide (SIW) leaky wave technique is used. As a result, the antenna has a good gain of more than 10 dB across the resonating band, and a tapered feeding technique (on ports 1 and 2) is used to improve matching, resulting in a good impedance bandwidth. image