研究目的
Investigating the development of a high-power 240–290 GHz waveguide enclosed two-dimensional (2-D) grid heterostructure barrier varactor (HBV) frequency multiplier capable of utilizing increasing available power at around 100 GHz.
研究成果
A tunable 240–290 GHz waveguide enclosed 2-D grid HBV frequency tripler has been designed and characterized experimentally. Peak conversion efficiency of 4.3% is achieved with 400 mW of input power at 247 GHz. A tuner enables tuning of the inherently narrowband varactor circuit over an 18% relative bandwidth.
研究不足
The potential problem with output power in other modes than the fundamental H10 has not been carefully investigated. The uneven conversion efficiency between the different columns, particularly at high-drive levels may explain the increasing difference between modeled and measured conversion efficiency.
1：Experimental Design and Method Selection:
The multiplier 2-D grid module is based on a 72 element heterostructure barrier varactor diode (HBV) tripler configured as 6 × 12 dipole unit cells. A combination of transmission line theory and numerical finite element frequency domain models is used to create the cascaded unit cell models.
2：Sample Selection and Data Sources:
The 2-D grid contains 72 unit cells but two assumptions in respect of symmetry are used to reduce the number of parallel unit cells in the simulation to six.
3：List of Experimental Equipment and Materials:
The multiplier module from input to output consists of a 380 μm thick InP matching slab that can be moved by the tuner, the dipole array on the 200 μm varactor substrate and a bandpass filter surface on 150 μm quartz.
4：Experimental Procedures and Operational Workflow:
The module is tuned for maximum output power at each input power point, i.e., maximum vector summed efficiency.
5：Data Analysis Methods:
The output power values from the six unit cells are summed and then divided by the total input power to the unit cells for scalar summed efficiency. In the vector summed efficiency, the unit cells are power combined in the simulation software, thus accounting for the phase difference at the outputs.
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