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A dual-band coaxial waveguide mode converter is investigated. In the converter, the TEM mode (Coa.TEM) and TM 01 circular waveguide (Cir.TM 01 ) mode are transformed simultaneously into TE 11 coaxial waveguide (Coa.TE 11 ) mode and TE 11 circular waveguide (Cir.TE 11 ) mode, respectively. The optimized geometrical dimensions are achieved by employing the mode coupling theory. A mode converter at 1.3 GHz and 5.0 GHz is designed, and conversion efficiencies of Coa.TEM-to-Coa.TE 11 and Cir.TM 01 -to-Cir.TE 11 are 99.88% and 99.70% at central frequency, respectively. Over the frequency ranges 1.15–1.51 GHz and 4.87–5.19 GHz, the conversion efficiency exceeds 90%. A good agreement between theoretical calculations and computer simulations is observed, demonstrating the feasibility of the dual-band mode converter.
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Zhang et al. (2011) studied this question.
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