Mid-infrared light provides numerous unexpected opportunities in scientific discoveries because this wavelength region covers the fingerprints of various molecular vibrational resonances. However, the light generation efficiency and bandwidth have been a long-standing bottleneck which has limited the development so far. Moreover, the light source that can be integrated with other components suc...

Novel designs of circular waveguide components for lowpass, highpass, bandpass, and bandstop applications are presented. The filters are formed by cascaded TM11-mode resonator sections which share a common axis, thus preserving the polarizations of input signals due to rotational symmetry. Moreover, the filters are smaller than standard TE11-mode bandpass filters. Basic design considerations ar...

This paper discusses a discrete-time modeling technique where the length of time delays can be arbitrarily adjusted. The new system is called a fractional delay waveguide model (FDWM). Formerly, FDWMs have only been implemented with FIR-type fractional delay filters. We show how an FDWM can be implemented using allpass filters. We use low-order allpass filters that are maximally-flat approximat...

This paper collects together various facts about digital waveguide networks (DWN) used in acoustic modeling, particularly results pertaining to lossless scattering at the junction of N intersecting digital waveguides. Applications discussed include music synthesis based on physical models and delay effects such as artificial reverberation. Connections with Wave Digital Filters (WDF), ladder/lat...

A sub-harmonic mixer for the 220-325GHz band was developed using a SiC platform first time. An anti-parallel Fermi-level managed barrier diode pair monolithically integrated with waveguide couplers and filters on an epi-layer transferred substrate. The chip assembled in waveguide-input package broadband transimpedance amplifier. lowest obtained noise equivalent power as low 5×10-19W/Hz signal f...

A novel dual-band filter based on substrate integrated waveguide (SIW) is presented in this paper. The proposed filter is composed of two filters with different center frequencies and bandwidths, where they share input and output ports with source-load coupling using rectangular SIW cavity structure. Multi-transmission zeros have been obtained through electrical coupling between the source and ...