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An n‐shaped antenna with multimode for wideband application based on substrate integrated suspended line (SISL) platform is presented using characteristic mode analysis (CMA). By exciting three modes simultaneously, a wideband characteristic is achieved. The size of the proposed antenna is 0.74 λ0 × 1.47 λ0 × 0.11 λ0 (where λ0 is the free‐space operating wavelength at the center frequency of 6.205...