Ultra-wideband coaxial directional coupler

Abstract

The invention discloses an ultra-wideband coaxial directional coupler. The coupler comprises a coupled cavity; a coaxial input connector, a coaxial output connector and a coaxial coupling connector are arranged on the outer wall of the coupling cavity; a coupling inner conductor and a load are arranged in the coupling cavity; the coupling inner conductor comprises a main path coupling inner conductor and an auxiliary path coupling inner conductor which are distributed in a gradual change line; two ends of the main path coupling inner conductor are respectively connected with the coaxial inputconnector and the coaxial output connector through elastic connecting assemblies, and two ends of the auxiliary path coupling inner conductor are respectively connected with the coaxial coupling connector and a load through elastic connecting assemblies; and the coupling inner conductor is connected with the coupling cavity through a support rod in the longitudinal direction. The coupler disclosedby the invention realizes good coupling, high isolation and high directivity indexes of the coupler in a working frequency range of 100MHz-110GHz. And meanwhile, a fuzz button spring type contact assembly is adopted, so that elastic contact in a small size and a good transmission function can be considered.

Description

technical field [0001] The invention relates to a coupler, in particular to an ultra-wideband coaxial directional coupler. Background technique [0002] Directional couplers are widely used in microwave radio frequency systems, usually for power sampling, isolation, mixing and power monitoring. The directional coupler is generally composed of three parts: the main channel straight-through transmission line, the auxiliary channel coupling line and the coupling structure. The working principle is that the microwave signal is input and output through the direct channel. signal separation. The directional coupler can be divided into various types according to different applications. Among them, the coaxial directional coupler mostly adopts the stripline coupling design structure, and the inner conductor of the secondary coupling needs to be transformed into multiple steps to achieve the broadband index. The length of each step is set is a quarter of the wavelength of the cente...

AI Technical Summary

Problems solved by technology

If the ultra-wideband operating frequency index of 100MHz-110GHz is to be realized, the limited number of step changes cannot meet the design requirements

[0003] At present, the coaxial directional coupler that can be applied to 110GHz has a narrow operating frequency, mostly 50GHz-110GHz, which cannot meet the requirements of ultra-wideband use.

This requires the use of multiple coaxial directional couplers for combined design in order to achieve ultra-wideband operating frequencies such as 100MHz-110GHz or 3GHz-110GHz, resulting in relatively large design limitations and high supporting costs

Images