Low-grade exhaust heat is used to provide a reliable and independent power source for instrumentation circuitry by means of a thermoelectric generator (TEG). A design of a self-starting dc-dc converter is developed and optimized for verylow-input voltages (below 300 mV) in order to allow operation at temperature differences of 20 C and less. A prototype is built, and the results are experimentally verified.

Low-grade exhaust heat is used to provide a reliable and independent power source for instrumentation circuitry by means of a thermoelectric generator (TEG). A design of a self-starting dc-dc converter is developed and optimized for verylow-input voltages (below 300 mV) in order to allow operation at temperature differences of 20 C and less. A prototype is built, and the results are experimentally verified.

An analysis method based on the coupled-integral-equations technique (CIET) and the mode-matching technique (MMT) is presented for the design of a variety of directcoupled waveguide filters suitable for applications in the lower gigahertz frequency range. The method is verified by comparison with data obtained through other numerical techniques and measurements. With reference to standard waveguide filters, the issues of filter miniaturization and stopband extension toward higher frequency bands are investigated. For given frequency specifications in the 2-GHz frequency range, examples of rectangular coaxial waveguide filters, ridge waveguide filters, ridge waveguide filters including coupling irises and T-septum waveguide filters are presented. It is demonstrated that the rectangular/square coaxial waveguide filter achieves the highest degree of miniaturization, but that ridge and, especially, T-septum waveguide filter technology is advantageous with respect to stopband performance toward higher frequencies. In particular, a T-septum filter centered at 2.155 GHz is shown to block the entire frequency range up to 7.5 GHz. © 2002 Wiley Periodicals, Inc. Int J RF and Microwave CAE 12: 217-225, 2002.

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