Pengcheng Jia

Learn More
High power, broad bandwidth, high linearity and low noise are among the most important features in amplifier design. Broadband spatial power combining techniques address all these issues by combining the output power of a large quantity of microwave monolithic integrated circuit (MMIC) amplifiers in a broadband coaxial waveguide environment, while(More)
High power, broad bandwidth, high linearity, and low noise are among the most important features in amplifier design. The broad-band spatial power-combining technique addresses all these issues by combining the output power of a large quantity of microwave monolithic integrated circuit (MMIC) amplifiers in a broad-band coaxial waveguide environment, while(More)
Dense arrays of tapered-slot or finline transitions have proven useful in the design of compact spatial power combiners. In this paper, a design procedure is established for tapered finline arrays, providing a broad-band impedance match to a target load over the waveguide band. The procedure is based on an extension of the Klopfenstein optimal taper design(More)
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 6-18 GHz bandwidth and capacity for 32 MMIC amplifiers. A broadband slotline to microstrip line transition is developed and monolithically integrated with(More)
As the commercially available microwave monolithic integrated circuit (MMIC) amplifiers improve in output power and bandwidth a compact platform to combine a large number of these MMICs, becomes very desirable. A reduced size version of a coaxial waveguide combiner structure using an antipodal finline antenna array is investigated. The reduced size coaxial(More)
OBJECTIVE We assessed the clinical results of a biodegradable plate system for the internal fixation of mandibular fractures in children, and observed the imaging features of fracture healing and bone changes around the biodegradable plates and screws during follow-up. PATIENTS AND METHODS We enrolled 39 patients (22 male, 17 female, average age 4 years(More)
This paper reports an X-band solid-state power amplifier with an initial output power of 180W at 9.5 GHz and greater than 100 watts measured over an 8 to 11 GHz bandwidth after burn-in. These SOA results were achieved by combining 16 GaN amplifier modules in a low-loss spatial power combiner network. The combining structure has shown a port to port loss of(More)