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

该研究项目计划开发一种使用集成固态器件作为实用毫米波辐射源的空间功率组合振荡器。该振荡器将大量固态源器件（如Gunn二极管、谐振隧道二极管（RTD）和HEMT）的相干辐射功率结合在一个准光学谐振腔中，从而产生强烈的辐射功率。在这个项目中，开发了两种类型的准光学谐振器。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，另一种是具有包含Gunn二极管的TE10模式波导阵列的过模波导谐振器。理论和实验结果如下：1。采用3 × 3波导Gunn二极管阵列，在60 GHz频段的效率约为83%，输出功率为1.5 W（连续波）。100GHz频段的超模波导振荡器已经成功实现。具有3x3波导Gunn二极管阵列的振荡器在98 GHz时产生了0.45 W的效率，效率超过50%。这些结果表明，用于固态器件空间功率组合的超模波导谐振器对于产生强毫米波是非常有用的。开发了过模波导振荡器的等效电路来设计谐振器。在10 ~ 30ghz的频率范围内，理论上开发了具有HEMT阵列的gfp振荡器等效电路，并进行了实验验证。此外，还开发了一种新的谐振腔结构，可以轻松地将大型HEMT阵列集成到谐振腔中。为了在亚毫米波区域的gfp谐振器中使用谐振隧道二极管（RTD），研究了采用串联方式去除传统RTD振荡器通常产生的杂散振荡。理论和实验结果表明，串联RTD不会产生不必要的低频振荡。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