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ANSWERS TO QUESTIONS Q1. THROUGH Q18. - 14183_166
Appendix I - Continued - 14183_168

Neets Module 11-Microwave Principles
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AI-1 APPENDIX I GLOSSARY APERTURE—See slot. BOUNDARY CONDITIONS—The two conditions that the E-field and H-field within a waveguide must meet before energy will travel down the waveguide. The E-field must be perpendicular to the walls and the H-field must be in closed loops, parallel to the walls, and perpendicular to the E-field. BEARING—An angular measurement that indicates the direction of an object in degrees from true north. Also called azimuth. BUNCHER CAVITY—The input resonant cavity in a conventional klystron oscillator. BUNCHER GRID—In a velocity-modulated tube, the grid which concentrates the electrons in the electron beam into bunches. CATCHER GRID—In a velocity-modulated tube, a grid on which the spaced electron groups induce a signal. The output of the tube is taken from the catcher grid. CAVITY RESONATOR—A space totally enclosed by a metallic conductor and supplied with energy in such a way that it becomes a source of electromagnetic oscillations. The size and shape of the enclosure determine the resonant frequency. CHOKE JOINT—A joint between two sections of waveguide that provides a good electrical connection without power losses or reflections. COOKIE-CUTTER TUNER—Mechanical magnetron tuning device that changes the frequency by changing the capacitance of the anode cavities. COPPER LOSS—Power loss in copper conductors caused by the internal resistance of the conductors to current flow. Also called I2R loss. CROWN-OF-THORNS TUNER—See Sprocket Tuner. CUTOFF FREQUENCY—The frequency at which the attenuation of a waveguide increases sharply and below which a traveling wave in a given mode cannot be maintained. A frequency with a half wavelength that is greater than the wide dimension of a waveguide. DIELECTRIC CONSTANT—The ratio of a given dielectric to the dielectric value of a vacuum. DIELECTRIC LOSSES—The electric energy that is converted to heat in a dielectric subjected to a varying electric field. DIRECTIONAL COUPLER—A device that samples the energy traveling in a waveguide for use in another circuit. DIRECTIVITY—The narrowness of the radiated beam from an antenna.






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