A Waveguide Magic-T With Coplanar Arms for High-Power Solid-State Power Combining

In this paper, a compact waveguide magic-T for high-power solid-state power combining is proposed. The coplanar arms of the <inline-formula> <tex-math notation="LaTeX">$E$ </tex-math></inline-formula> and <inline-formula> <tex-math notation="LaTeX">$H$ </tex-math></inline-formula> ports are realized by the <inline-formula> <tex-math notation="LaTeX">$E$ </tex-math></inline-formula>-plane power divider and ridge waveguide coupling structure. The input port of the <inline-formula> <tex-math notation="LaTeX">$E$ </tex-math></inline-formula>-plane power divider is used to realize the difference port of the magic-T, and the ridge waveguide port is utilized to realize the sum port. Based on a theoretical analysis, a modified magic-T with two coaxial ports, one ridge port, and one rectangular port is designed and fabricated. Low-power tests show that from 7.8 to 9.4 GHz, when the difference port and the sum port are excited, the insertion loss of the magic-T is less than 0.2 dB. The isolation between the sum/difference ports and the two input ports is better than 40 and 26 dB. As for the in-phase and out-of-phase excitation, the amplitude and phase imbalances are less than ±0.05 dB and 1°. High-power experiments indicate that the power capacity is no less than 14 kW with a 1-<inline-formula> <tex-math notation="LaTeX">$\mu \text{s}$ </tex-math></inline-formula> pulsewidth. The measured results agree with the simulations.

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