• A.Saritha
• B.V.S.Y.Nandini
• G.Hemanjali

This study introduces substrate integrated waveguide (SIW)-backed antenna designs capable of self-quadruplexing and self-diplexing, offering a compact, lightweight, and efficient solution for multiplexing applications in multiband communication systems. The self- quadruplexing antenna design integrates an SIW cavity with its top side modified to create four patches of different lengths. Each patch is fed by a separate 50-Ω microstrip feed line, enabling operation at distinct frequencies: 6.08, 7.31, 11.3, and 13.4 GHz. This design achieves peak gains of 4.1 dB, 4.96 dB, 6.2 dB, and 6.1 dB at the frequencies of 6.08, 7.31, 11.3, and 13.4 GHz, respectively, with an isolation levels exceeding 29dB. Meanwhile, the self-diplexing antenna, which utilizes a similar SIW cavity modification, incorporates two patches of different lengths to operate at 8 and 10 GHz. These patches are fed by two 50-Ω microstrip feed lines. This configuration achieves peak gains of 4.8 dB and 6.4 dB at the frequencies of 8 and 10 GHz, respectively, with isolation level exceeding 24dB. Both antennas are fabricated using an RT-Duroid (5870) suited for a wide range of applications in modern multiband communications, including wireless routers, portable devices, and custom-built communication systems

Antenna, SIW, Self-diplexing, self-quadruplexing

"Design of substrate integrated waveguide based self-multiplexing antennas", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.11, Issue 4, page no.h692-h701, April-2024, Available :http://www.jetir.org/papers/JETIR2404779.pdf

"Design of substrate integrated waveguide based self-multiplexing antennas", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.11, Issue 4, page no. pph692-h701, April-2024, Available at : http://www.jetir.org/papers/JETIR2404779.pdf