Dual‐mode wideband slotted patch antenna using characteristic mode analysis and low‐cost SISL technology

Abstract

AbstractA dual‐mode wideband slotted patch antenna using characteristic mode analysis (CMA) on substrate integrated suspended line (SISL) platform is presented. The proposed antenna combines the fundamental mode (TM01) and a higher‐order mode (TM21) of a rectangular patch to enhance antenna bandwidth. First, detailed studies into the modal significance, far‐field pattern, and current distribution on the potential radiating patch with the assistance of the CMA. The split radiation pattern of the TM21 mode is reshaped into a single directive pattern through slot‐loading techniques on the rectangular patch. The TM21 shifts close to the fundamental mode with similar polarization currents at the short‐edge length of the patch. Full‐wave simulations are performed to verify the CMA report by exciting the TM01 and TM21 modes. The proposed antenna is fabricated and tested. The experimental results agree well with the simulations and show a −10 dB bandwidth of 3.30–3.65 GHz. An average gain and efficiency of more than 7.0 dBi and 86% are accomplished in measurement over the operation band of the ongoing 5G communication. Besides, the antenna exhibits a compact size, low cost, and self‐package characteristics.