Active quasi-optics and measurements

• Main Author: Deckman, Blythe Chadwick
• Format: Others
• Language: en
• Published: 2000
• Online Access: https://thesis.library.caltech.edu/6094/2/Deckman_bc_2000.pdf; Deckman, Blythe Chadwick (2000) Active quasi-optics and measurements. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/a6x5-z643. https://resolver.caltech.edu/CaltechTHESIS:10052010-090202496 <https://resolver.caltech.edu/CaltechTHESIS:10052010-090202496>

Quasi-optical grid amplifiers and oscillators have been limited in power to less than a watt at Ka-band until recently. Additionally, measurements of grid structures have been done with far-field techniques, making reflection measurements difficult. Some focused techniques have been used as well. Here are presented a 5-watt grid amplifier at 37.2 GHz, and a grid oscillator, after Moonil Kim, that shows 1 watt of effective transmitter power at 38 GHz. Focused beam measurement techniques are also discussed, introducing a new method to calibrate a network analyzer for reflection measurements. Measurements are presented on passive structures to validate the calibration technique, and then measurements of the active structures are presented. Following the presentation of the 5-watt amplifier and l-watt oscillator, a design technique for a l0-watt grid amplifier is presented, along with a mode converter that allows the grid to be fed from a standard waveguide port.