Circuit, 58 Wave guide

Ultem polyetherimides have applications in areas where high strength, dimensional stability, creep resistance, and chemical stability at elevated temperatures are important. Uses include electrical connectors, wave guides and printed circuit boards for electronic equipment, food applications (microwaveable containers, utensils, and films), aircraft interior materials, and sterilizable medical equipment. 

The microwave circuit used in this study is shown in Figure II. The Gerling-Moore variable 0-2.5 kW power generator operates at 2450 MHz. Three crystal detectors in the circuit measure forward, reflected, and transmitted power and are mounted in the S-band wave-guide (3.8 x 7.6 cm). The latter two power measurements are recorded continuously. Constant forward power and magnetron protection are ensured by the presence of a 3-port circulator. The impedance of the circuit is manually matched with the E-H field tuner. The reactor is placed through the wave guide as shown. 

Dry process with oxygen plasma etching has been studied (84,85). UV-irradiation of polysilanes converts the Si—Si bonds to Si—O—Si bonds selective and efficiently. The resultant siloxane-bonded products are flexible and have different refractive indexes. They interact with polar materials and then are utilized for color filter and microlens production via a sol-gel process (86), depositing metals for electric circuits (87), wave guides, or optical recording (Fig. 10) (88). 

The role of microoptics is then believed to be not as a substitute for other components such as guided-wave optic components or fiber optic circuits, but for the purpose of fully utilizing these optical systems more effectively by cooperating with them. It is hoped that some more modern concepts will evolve to integrate microoptic devices without leaving them as old discrete optics. One of the ideas may be stacked planar optics, which will be discussed in detail in Section VII. 

Ashley, P. R., and Tumolillo, T. A., Jr., Overview of EO polymers for guided wave devices, SPIE Proc. Integrated Opt. Circuits, 1583, 316 (1991). 

The monthly journals IEEE Transactions on Miaowave Theory Techniques, IEEE Microwave and Guided Wave Letters, andlEEE Transactions on Antennas and Propagation publish articles on modeling and design of microwave passive circuit components. Articles in the first two journals are more circuit and component oriented, whereas the third focuses on field theoretic analysis. These are published by the Institute of Electrical and Electronics Engineers, Inc. For subscription or ordering contact IEEE Service Center, 445 Hoes Lane, P.O. Box 1331, Piscataway, NI 08855-1331. 

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