TE102 mode CT structure terahertz cross coupling waveguide filter

Abstract

The invention discloses a TE102 mode CT structure terahertz cross coupling waveguide filter, and belongs to the technical field of terahertz. According to the filter, based on a conventional CT structure, a TE102 mode is employed, and transmission zeros can be generated at a low terminal of a stop band. The filter comprises transitions, rectangular resonant cavities, and coupling diaphragms, the filter is divided into three layers based on the vertical direction, and each layer can avoid the generation of an island structure. According to the filter, cross coupling is realized in the terahertz frequency band, the structure is simple and novel, the echo loss in a passband is low, the insert loss is low, the suppression performance of the stop band is good, and the filter is especially applicable to the SU-8 equal-dividing layer thick-film process for processing.

Description

technical field [0001] The invention belongs to the technical field of terahertz technology, and in particular relates to a TE102-mode CT structure terahertz cross-coupled waveguide filter. Background technique [0002] The terahertz frequency band is defined as the electromagnetic spectrum range of 300GHz-3000GHz, and the lower limit of the frequency band can also be broadly extended to 100GHz. This frequency band is connected to the millimeter-wave frequency band below and the far-infrared frequency band to the upper end. It has a unique position in the electromagnetic spectrum and is at the junction of the research fields of electronics and photonics. Restricted by the previous technical level, this frequency band has become one of the few blanks in the electromagnetic spectrum; in view of the increasingly crowded status of the electromagnetic spectrum in the past ten years, with the help of the rapid development of modern electronic technology, the development and utiliz...

AI Technical Summary

Problems solved by technology

[0006] The SU-8 layered thick film process is one of the main processes for manufacturing THz filters, but the SU-8 process is difficult to process a closed structure, that is, a filter containing an island structure; the reason is that the etching of the SU-8 layered thick film process The depth is equal to the thickness of SU-8, so the terahertz cross-coupled filter with island structure cannot be processed due to the lack of support structure

However, the input and output waveguides, the three resonant cavities, the direct coupling diaphragm and the cross-coupling diaphragm of the above-mentioned 3-cavity filter are all located on the same plane, that is, a closed structure is formed on the same plane, including islands, so it is difficult to use SU- 8 process to process the filter with the above-mentioned 3-cavity structure

[0007] At present, the research on THz waveguide filters at home and abroad mainly adopts direct coupling methods, such as inductive diaphragms, capacitive diaphragms, and offset structures for coupling, but there is little research work on THz cross-coupled waveguide filters.

Images