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A dual‐fed low‐profile self‐diplexed slot antenna is proposed for 5.2/5.8 GHz applications. The antenna mainly comprises a half‐mode substrate integrated waveguide (HMSIW)‐based cavity, loaded with a slot and microstrip feedlines. A radiating slot is etched on the upper metal cladding of the HMSIW cavity which splits the cavity into two sections. When each section is excited by using two orthogonally placed feedlines, it generates two frequency bands around 5.2 and 5.8 GHz. By finely tuning the antenna dimensions, a very high isolation of better than 30 dB is realised between the input‐ports. Thereby, the proposed antenna exhibits the self‐diplexing property. Finally, the proposed antenna is fabricated and the experimentally tested. The experimental results show a close mutual agreement with simulations. Moreover, the antenna shows unidirectional, stable and similar radiation characteristics at both the operating frequencies with maintaining planar configuration. The proposed design provides an easier, compact and a more cost‐effective solution for RF front‐end components and substitutes the conventional complex diplexer networks.

In this study, a wideband half-mode substrate integrated waveguide (HMSIW)-based cavity-backed slot antenna is proposed for Unlicensed National Information Infrastructure (U-NII, 5.180-5.825 GHz) band. To reduce the size of the antenna, an HMSIW backing cavity is used. An epsilon-shaped radiating slot is etched on the top plane of the cavity to achieve a wide −10 dB impedance bandwidth of 13.2% (5.092-5.817 GHz). A planar exponential tapered feeding technique is used to excite the slot. A wideband is realised by coupling of hybrid mode, TM 210 mode, and modified TM 020 modes at the resonant frequencies of 5.2, 5.5, and 5.8 GHz, respectively. The size of the proposed design including a feeding network is 56 mm × 32 mm (1.4λ g1 × 0.8λ g1). The proposed design is fabricated and experimentally tested. The experimental results show gains of 6.6, 6, and 5.5 dBi and efficiencies of 91, 89, and 87% at the frequencies of 5.2, 5.5, and 5.8 GHz, respectively, with front-to-back ratio better than 15 dB. Moreover, the proposed antenna shows a unidirectional radiation pattern including the advantages of low-profile and lightweight with planar integrity which makes the proposed antenna a favourable candidate for wireless fidelity application.

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