Miniature dielectric loaded filters
The objective of this project is to develop dielectric loaded filters using very high dielectric constant materials (er = 80 to 200). The use of dielectric materials with such high dielectric constants will make it possible to design miniature filters. The proposed configurations are amenable to mass production and are particularly useful for wideband applications.
Miniature conductor-loaded cavity resonator filters
The objective of this project is to develop lumped-element conductor-loaded resonators and filters with improved spurious performance.
Bandgap-based filter structures
The objective of this project is to develop novel configurations for planar and waveguide filters using bandgap technology. The idea is to combine several periodic structures to create unique filter characteristics.
Temperature compensation of filters using shape-memory alloys
The objective of this project is to use shape-memory alloys (SMA) for temperature compensation of aluminum cavity resonators and filters. The use of aluminum cavities rather than invar cavities would have a considerable saving on the mass of filters and multiplexers.
Tunable filters
The objective of this project is to develop filters with a tunable center frequency and a tunable bandwidth. An algorithm is being investigated which minimizes the number of tuning elements needed to achieve tunability in both center frequency and bandwidth.
Metamaterial-based filter structures
Metamaterials are artificial materials that exhibit electromagnetic characteristics generally not found in nature such as negative permittivity and negative permeability. The objective of this project is to investigate the feasibility of using such materials in realizing novel microwave filter structures.
Computer-aided diagnosis of filters using fuzzy logic techniques
The objective of this project is to use fuzzy logic techniques in tuning microwave filters. In contrast to traditional frequency domain and time domain techniques, which are only based on theoretical models, the fuzzy logic technique is capable of combining theoretical models, measured data and expert information into one comprehensive model.
Miniature high power multiplexers
The objective of this project is to develop low-cost high power miniature multiplexers for phase array antenna applications.
Superconductor channelizers
The objective of this project is to develop a channelizer using both high temperature and low temperature superconductors.