A Compact Coaxial Waveguide Combiner Design For Ultra-Broadband Power Amplifiers
نویسندگان
چکیده
We report an enhanced broadband passive combiner structure using a dense slot-line antenna array in an oversized coaxial waveguide. A significant reduction in size has been achieved while maintaining a 6-18GHz bandwidth and capacity for 32 MMIC amplifiers. A broadband slotline to microstrip line transition is also developed and monolithically integrated with the slot-line antennas, to eliminate a troublesome bond-wire transition in earlier design and provide better compatibility with commercial MMICs. The Spectral Domain Method (SDM) is applied to compute the field in the structure, and small reflection theory is extended to synthesize the waveguide taper and optimized slotline taper array.
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