Title :
Multioctave spatial power combining in oversized coaxial waveguide
Author :
Jia, Pengcheng ; Chen, Lee-Yin ; Alexanian, Angelos ; York, Robert A.
Author_Institution :
Dept. of Electr. & Comput. Eng., California Univ., Santa Barbara, CA, USA
fDate :
5/1/2002 12:00:00 AM
Abstract :
We describe a multioctave power-combiner structure using finline arrays in an oversized coaxial waveguide. The spectral-domain method (SDM) is used to compute the propagation constant in this structure, and is verified with HFSS simulations. The SDM method is then employed to synthesize broad-band tapered impedance transformers in finline for coupling energy to and from a set of monolithic microwave integrated circuit (MMIC) amplifiers. A modular assembly is described using a sectoral tray architecture. The concept is demonstrated for a 32-MMIC system using low-power traveling-wave amplifier MMICs, providing a 3-dB bandwidth of 13 GHz (3-16 GHz). An output combining loss of 1 dB is estimated from the small-signal measurements, suggestion a combining efficiency of ~75% for 32 MMICs
Keywords :
MMIC amplifiers; coaxial waveguides; fin line components; frequency response; impedance convertors; power combiners; spectral-domain analysis; travelling wave amplifiers; 13 GHz; HFSS simulations; MMIC amplifiers.; broadband tapered impedance transformers; finline arrays; finline transitions; frequency response; low-power traveling-wave amplifier; modular assembly; multioctave spatial power combining; oversized coaxial waveguide; sectoral tray architecture; slotline array; spectral-domain method; Circuit simulation; Coaxial components; Computational modeling; Coupling circuits; Finline; Impedance; Integrated circuit synthesis; MMICs; Propagation constant; Transformers;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
