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HIGH POWER MICROWAVE FILTERS FOR THE SUPPRESSION OF SPURIOUS ENERGY.
STANFORD RESEARCH INST MENLO PARK CALIF
A new circuit for the 3-db short-slot sidewall coupler was tested as a harmonic pad. A new type of low-pass waveguide filter that attenuates by dissipation and has a very wide stop band is described. A trapped-mode band-pass filter is described, in which the spurious responses due to higher-order resonances are eliminated by heavily damping all but the fundamental resonance, thus realizing a very wide stop band. A non-reflecting diplexer-type waveguide filter was synthesized, using two complementary filters, one band-pass filter and one band-stop filter. Numerical data are presented in graphical form on the characteristic impedance of coaxial lines consisting of a circular inner conductor and a rectangular outer conductor. Wire grid waveguide bolometers are shown to be similar to, but more stable and reproducible than, thin-film bolometers. The modes of a confocal resonator are found to be separable because of their unique transverse spatial distribution so that, despite a high degree of mode degeneracy, highpower millimeter-wave filters appear realizable. Lowpass and high-pass filters can be built at millimeter wave frequencies using stacks of dielectric plates. A multi-harmonic rejection filter, has been designed by an exact method.
Final rept. for 15 Sep 63-14 Sep 64,
AF30 602 3174