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An ultrawideband double‐ridge horn (DRH) antenna having a high gain and excellent impedance matching is presented. Two metal reflectors are perpendicular to the two ridges for improving the lower‐ and center‐frequency gain, while two sets of metallic gird sidewalls are used to fix the two reflectors together for structural stability and further increase the lower frequency gain. Additionally, a fork‐shaped dielectric plate, which is fixed between the ridges, is used to improve the higher frequency gain. To improve the impedance matching at 1–18 GHz, a microstrip line having a smoothly tapered ground plane is employed to feed the DRH antenna. Good impedance matching for VSWR < 1.85 and high gain ranging from 7.6 to 18.6 dBi are obtained for the designed DRH antenna.
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Chen et al. (2025) studied this question.
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