Analysis and design of dielectric-lens antennas and planar multiplier circuits for millimeter-wave applications.

In this thesis, integrated antennas and frequency multipliers are designed, fabricated, and tested at microwave, millimeter-wave, and submillimeter-wave frequencies. A double-dipole antenna is fabricated for submillimeter-wave applications, and is successfully tested at 250 GHz and 2.5 THz. A new type of antenna/lens system is presented, the extended-hemispherical dielectric lens. A complete characterization of coupling efficiencies and radiation patterns of the extended-hemispherical dielectric lens is presented for an on-axis element. Also, off-axis calculations are presented, showing all important parameters versus off-axis displacement: scan angle, directivity, Gaussicity, and reflection loss. Experimental pattern measurements of imaging arrays at 250 GHz are included, and show excellent agreement with the theory. Some design rules are discussed for imaging arrays on dielectric lens antennas. A X7 DHBT frequency multiplier is presented which has low spurious harmonics for a 1 GHz input frequency. A novel frequency multiplier is also presented which is designed to operate in a varactor mode with good conversion loss ($>$8 dB), yet with a wide bandwidth. A MIC version is successfully tested at an output frequency of 6-10 GHz. A MMIC version is designed, fabricated, and tested at an output frequency of 60-90 GHz.PhDApplied SciencesElectrical engineeringUniversity of Michigan, Horace H. Rackham School of Graduate Studieshttp://deepblue.lib.umich.edu/bitstream/2027.42/129687/2/9610117.pd