Quasi-optical oscillator with a solid state device array at millimeter wavelengths

本研究计划利用集成固态器件作为实用的毫米波辐射源，研制一种空间功率合成振荡器。该振荡器将大量固态源器件(如体效应二极管、共振隧穿二极管和HEMT)的相干辐射功率组合在一个准光学谐振器中，从而产生强烈的辐射功率。在这个项目中，已经开发了两种类型的准光谐振腔。其中一种是用于大量HEMT的金属槽镜型法布里-珀罗(GFP)谐振器，另一种是由含有耿氏二极管的TE10模波导阵构成的过模波导谐振器。理论和实验结果如下：1.采用3×3波导体效应二极管阵列，在60 GHz频段获得了约83%的效率和1.5W的连续输出功率。研制成功了100 GHz频段过模波导振荡器…更加发达。该振荡器采用3×3波导体效应二极管阵列，在98 GHz下获得了0.45W的输出功率和50%以上的效率。这些结果表明，用于固态器件空间功率合成的过模波导谐振腔对于产生强毫米波是非常有用的。建立了过模波导谐振器的等效电路，设计了谐振器。从理论上建立了HEMT阵列GFP振荡器的等效电路，并在10~30 GHz频率范围内进行了实验验证。此外，还开发了一种新的振荡器结构，可以很容易地将大型HEMT阵列集成到振荡器中。为了将共振隧穿二极管(RTD)应用于亚毫米波GFP谐振器中，研究了采用串联方式消除传统RTD振荡器产生的杂散振荡的方法。理论和实验结果表明，串联RTD不会产生不必要的低频振荡。较少

This research project has been planed to develop a spatial power-combining oscillator using integrated solid-state devices as a practical millimeter-wave radiation source. The oscillator combines coherent radiation powers from a large number of solid-state source devices such as Gunn diodes, resonant tunneling diodes (RTD's), and HEMT's in a quasi-optical resonator, and consequently produces an intense radiation power. In this project, two types of quasi-optical resonators have been developed. One of them is a metal grooved mirror type Fabry-Perot (GFP) resonator for the used of a large number of HEMT's and the other is an overmoded-waveguide resonator with an array of TE10 mode waveguides containing Gunn diodes. The theoretical and experimental results are as follows,1. An efficiency of about 83 % and an output power of 1.5 W (continuous wave) at 60 GHz band has been achieved with a 3x3 waveguide Gunn diode array.2. The overmoded waveguide oscillator at 100GHz band has been successful … More ly developed. The oscillator with a 3x3 waveguide Gunn diode array has produced 0.45 W with an efficiency of more than 50% at 98 GHz. These results indicate that the overmoded waveguide resonator for spatial power combining of solid state devices is very useful for producing intense millimeter waves.3. The equivalent circuit for the overmoded waveguide oscillator has been developed to design the resonator.4. The equivalent circuit for the GFP-oscillator with a HEMT array has been theoretically developed and experimentally verified at frequencies between 10 and 30 GHz. In addition, a new resonator configuration for the oscillator is developed to incorporate a large HEMT array into the resonator easily.5. In order to use resonant tunneling diodes (RTD) in the GFP-resonator in a submillimeter wave region, removal of spurious oscillations usually produced by conventional RTD oscillators, using series connection has been investigated. The theoretical and experimental results have shown that the series connected RTD's do not produce the unwanted low frequency oscillations. Less