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This letter presents an alternative method to realize millimeter wave waveguide diplexers based on high selectivity bandpass filters. A small perturbation is implemented in a dual-mode circular cavity to expand the bandwidth and significantly enhance the selectivity of the channel filter. The location of a transmission zero can be easily adjusted by properly changing the angle of a perturbing notch...
In this paper, a terahertz waveguide filter using micromechanical milling process is designed and fabricated. The filter is designed at 255 GHz with a 3dB bandwidth of 30 GHz. The measured results show that the return loss is better than 15 dB and the insertion loss is about 3.9 dB at center frequency, good agreement between the measured and simulated results is achieved. In addition, the main loss...
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