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

本研究计画旨在研制一种利用整合式固态元件之空间功率合成振荡器，作为一种实用的毫米波辐射源。该振荡器将来自大量固态源器件（例如，古恩二极管、共振隧穿二极管（RTD）和HEMT）的相干辐射功率组合在准光学谐振器中，并因此产生强辐射功率。在这个计画中，两种类型的准光学共振腔已经被开发。其中之一是用于大量HEMT的金属槽镜型法布里-珀罗（GFP）谐振器，另一种是具有包含古恩二极管的TE 10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波导古恩二极管阵列，在60 GHz波段获得了约83%的效率和1.5 W的连续波输出.在100 GHz波段的过模波导振荡器已获得成功 关于我们 开发的。采用3 × 3波导古恩二极管阵列的振荡器在98 GHz时产生了0.45 W，效率超过50%。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.建立了过模波导振荡器的等效电路，为谐振器的设计提供了理论依据.在10和30 GHz之间的频率与HEMT阵列的GFP振荡器的等效电路已被理论开发和实验验证。此外，本文还提出了一种新的谐振腔结构，可以方便地将大尺寸HEMT阵列集成到谐振腔中.为了在亚毫米波区域中的GFP谐振器中使用谐振隧道二极管（RTD），已经研究了使用串联连接来去除通常由常规RTD振荡器产生的寄生振荡。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