Abstract
In the past decade, with the introduction of multi-layer low-temperature co-fired ceramic (LTCC) technology, terahertz(THz) filters embedded in multi-layer LTCC substrates, are shown to be promising in many applications of the microwave communication domain. This paper proposes two sub-millimeter wave filters and one THz band-pass filter designs based on waveguides and elements. They are rectangular bandpass filters featuring coupling cavity, metal posts and the combination of both metal posts and coupling cavity respectively. The simulation results of the three bandpass filters show that, these filters which innovatively make uses of rectangular waveguide structures embedded in multi-layer LTCC substrate, metal posts and coupling cavities, may meet the designing target and may function well in sub-millimeter wave or THz bands.
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