A High Decoupled Nested SIW Cavity Self‐Nonuplexing L‐Shaped Slot Antenna With Self‐Shielding for Advanced Wireless Systems and IoT Applications

ABSTRACT This paper introduces a novel l ‐shaped slots self‐nonuplexing antenna in a nested substrate integrated waveguide cavity for LTE 5537.5/WiFi/WiMAX (5.21–5.50 GHz), WLAN/ISM (5.71–5.89 GHz), satellite communication (6–6.27 GHz), super ext. C‐band (6.5–6.74 GHz), space communication (6.91–7.23 GHz), LTE/LTE advanced (7.45–7.69 GHz), meteorological satellite (7.90–8.12 GHz), ITU (8.21–8.79 GHz), and weather RADAR (8.75–9.33 GHz) applications. The antenna comprises eight different l ‐shaped slots in four subcavities and one square ring slot in the nested cavity. The inset feed of the 50 line has been used to excite the l ‐shaped slots, and the ring slot is excited by a coaxial feed line. Each slot radiates at nine different frequencies, such as 5.35, 5.8, 6.15, 6.6, 7.1, 7.65, 8.05, 8.65, and 9.2 GHz, respectively. The corresponding gains are 5.56, 5.84, 5.82, 6.32, 6.61, 7.50, 6.67, 6.77, and 7.08 dBi at the respective resonant frequencies. This antenna offers better than 20 dB measured isolation between any two ports and independent tenability features across any band. This antenna is appropriate for high‐integration portable devices because of its planar design and its ability to eliminate intermodal electromagnetic interference. This antenna ends the requirement of RF switches in multiband transceivers and Internet of Things‐based applications.