High-precision dielectric strip line broadside coupler

Abstract

The invention relates to a high-precision dielectric strip line broadside coupler. A rectangular area with a symmetrical axis is removed from a solid line of a main line of a coupling area, a one-to-two branch structure and a two-to-one branch structure are formed, the symmetry axis of the auxiliary line coincides with that of the main line, in a coupling region, two parts on the main line are coupled with the auxiliary lines, the coupling energy is superposed outside the coupling region, if the symmetry axis of the main line deviates from the symmetry axis of the auxiliary line, in the coupling region, coupling energy on a branch line, close to the symmetry axis of the auxiliary line, on the main line is enhanced, the coupling energy on branch lines, away from the symmetry axis of the auxiliary line, of the main line is weakened. Two paths of coupled energy are added, compared with the condition that the symmetry axes of the main line and the auxiliary line are completely overlapped,the energy outputted by a coupling end of the auxiliary line is slightly changed, the influence of deviation of the upper symmetry axis and the lower symmetry axis is counteracted, and the coupler which meets the coupling degree precision requirement and is less in debugging and even free of debugging can be designed under the condition of conventional printed board machining precision.

Description

technical field [0001] The invention belongs to the field of microwave technology, and in particular relates to an energy coupling technology. Background technique [0002] Couplers are commonly used components in microwave systems. The application scenarios include power distribution, synthesis, coupling, etc. In order to ensure the high precision and stability of the amplitude and phase of the coupled signal, most couplers use directional couplers. Generally speaking, those with a coupling degree between -10dB and 0dB belong to strong coupling and are mostly used for power distribution and synthesis; those with a coupling degree of less than -20dB belong to weak coupling and are mostly used for power monitoring. Depending on the type of transmission line selected, the coupler can be a waveguide coupler, a coaxial coupler, a microstrip coupler, a strip line coupler, etc. If the types of the main line and the auxiliary line are different, it is a hybrid coupler. [0003] Th...

AI Technical Summary

Problems solved by technology

[0005] The coupling degree of the coupler directly depends on the distance between the printed lines, and it is very sensitive to the change of the distance between the coupled lines in the plane direction. Under the process conditions, the yield of printed boards is not high

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