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This invention uses the structures of the finite-sized conductor-backed
coplanar waveguides for designing broadband switchable and tunable signal
filters. The design methods construct a plurality of configurations,
which including waveguides, via holes, metallic posts, and conductor
planes in the structures, for selecting, coupling, converting, and
dissipating of the signals with specific electromagnetic modes and
frequencies propagating through the structures. The dominant
electromagnetic modes of the signals include Coplanar Waveguide Modes and
Microstrip-Like Modes. The design methods thereby produce a plurality of
filter types, such as bandstop filters, bandpass filters, multiband
filters, etc. The design methods can apply to the structures with single
and multi-layer dielectric and metallic materials, such as Integrated
Circuits, Thin-film transistor Circuits, Low Temperature/High Temperature
Co-fired Ceramics (LTCC/HTCC), PCB, and others. In addition, the design
methods add switches to perform electrically controllable functions
including frequency band selection and filter type selection. The design
methods can also perform impedance matching of broadband signals by
electrically tuning the values of inductance and capacitance in
conjunction with the structures.
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