Improved terahertz branch waveguide coupler

Abstract

An improved terahertz branch waveguide coupler relates to the field of directional branch waveguide couplers. In the terahertz branch waveguide coupler, a second electromagnetic field channel is located between a first metal barrier and a second metal barrier, a first coupling fillet is formed at the end, close to a main channel and the second electromagnetic field channel, of the first metal barrier, a third coupling fillet is formed at the end, close to a coupling channel and the second electromagnetic field channel, of the first metal barrier, a second coupling fillet is formed at the end,close to the main channel and the second electromagnetic field channel, of the second metal barrier, and a fourth coupling fillet is formed at the end, close to the coupling channel and the second electromagnetic field channel, of the second metal barrier. According to the invention, four fillets are formed on the metal barriers on both sides of the second electromagnetic field channel, which increases the coupling coefficient of the second electromagnetic field channel, on the basis of ensuring the same or even better performance as the ordinary 5-branch line structure coupler, the width of the narrowest coupling channel of the branch waveguide structure is increased to 0.3 mm level, and thus the processing difficulty and cost are greatly reduced.

Description

technical field [0001] The invention relates to a directional branch waveguide coupler, in particular to an improved terahertz branch waveguide coupler. Background technique [0002] Terahertz wave is a very important cutting-edge technology field recognized by the international academic community. It is electromagnetic radiation with a wavelength in the range of 3mm-0.03mm (100GHz-10THz), and its waveband is between microwave and infrared. Due to its special location, terahertz waves can exhibit many unique characteristics that are different from other types of electromagnetic radiation. These characteristics determine that terahertz waves have broad application prospects in many fields. With the development of terahertz technology, it has great scientific value and broad application prospects in object imaging, environmental monitoring, medical diagnosis, radio astronomy, broadband mobile communication, etc. [0003] Directional couplers are four-port passive components u...

AI Technical Summary

Problems solved by technology

At present, in order to ensure its performance, most branched waveguide directional couplers in the terahertz frequency band adopt a 5-branch line structure, such as figure 1 As shown, the width of the narrowest coupling channel of the 5-branch line structure is usually at the level of 0.1 mm, which not only puts forward higher requirements for cavity processing, but also easily bends or even breaks the narrow barrier structure during processing.

The 5-branch structure waveguide directional coupler is extremely sensitive to size due to the narrow width of its narrowest coupling channel. In actual processing, if the processing accuracy cannot be guaranteed, the performance of the coupler will be significantly deteriorated; at the same time, the high-precision The cavity processing requirements also greatly increase the processing cost, and the existence of the narrow barrier structure will cause the stability and service life of the coupler to be greatly reduced

Images