Dual-Mode Based Filters and Filtering Antennas

The dissertation details several new filter and filtering antenna topologies. For filters, the novelties introduced include a microstrip version of M�bius loop res- onator based filter, a packaged dual-band filter constituted by novel dual-mode and dual-resonance substrate integrated waveguide (SIW) cavities and a method- ology for integration of planar resonators with SIW cavities in lieu of compact filtering structures. For the filtering antennas, flexible transmission zeroes (TZs) are introduced using source-load coupling, followed by the first single-layer SIW dual-band filtering antenna with orthogonal polarizations in the two bands. A methodology for synthesizing filtering antennas using coupling matrix synthesis is introduced. Also is shown a method of using multi-band filtering antennas to break the conventional limit of maximum possible n TZs from a n resonator filter. Finally, an on-chip resonant terahertz antenna with reasonable gain and bandwidth is reported