A UWB 3db Orthogonal Directional Coupler Circuit

Abstract

The invention discloses an ultra-wideband 3dB orthogonal directional coupler circuit, which is composed of n+1 coupled line couplers, wherein n is an odd number and has a symmetrical structure; the left side coupler consists of (n‑1) / 2 coupled The line couplers are cascaded; the right coupler is cascaded by (n-1) / 2 coupled line couplers; the middle section coupler is cross-cascaded by two stages of the same coupled line couplers. The technical effect of the invention is to adopt the multi-section coupled line coupler structure to expand the bandwidth, and to weaken the coupling strength of each level of coupled lines by cross-cascading the two-stage intermediate section coupling lines, thereby solving the problem of the traditional multi-section coupled line coupler intermediate section coupling line overloading. The problem of tight coupling. The ultra-wideband 3dB orthogonal directional coupler is composed of n+1 coupled line couplers, where n is an odd number, and the middle section is a cascade of two-stage coupled line couplers, with a symmetrical structure, and the input port and the isolation port are located on the same side. The through port and coupled port are on the other side, suitable for cascading with other circuits.

Description

technical field [0001] The invention relates to the technical field of microwave passive devices, in particular to an ultra-wideband 3dB orthogonal directional coupler circuit. Background technique [0002] Ultra-wideband 3dB quadrature directional coupler is an important microwave passive circuit, which can constitute power combiner, power divider, phase shifter, attenuator and vector modulator, etc. It is widely used in broadband communication, electronic countermeasures System, microwave radio communication, radar and space communication and other electronic equipment, its performance has a huge impact on radio frequency microwave system, so the study of ultra-wideband 3dB orthogonal directional coupler circuit that can be manufactured by integrated circuit technology has great application value and reality significance. [0003] In the traditional directional coupler structure, there are the following problems: the Lange coupler is widely used due to its simple structur...

AI Technical Summary

Problems solved by technology

[0003] In the traditional directional coupler structure, there are the following problems: the Lange coupler is widely used due to its simple structure and strong coupling, but its bandwidth is limited due to the length of λ / 4

The double-layer coupled line coupler obtains strong coupling through broadside coupling, but its four ports are not on the same plane, which is not conducive to cascading with other circuits, and the bandwidth is also limited due to the length of λ / 4

The multi-section coupled line coupler can greatly expand the bandwidth, but if a strong coupling degree is expected, a greater coupling strength of the intermediate section coupled line is required, which is sometimes difficult to achieve even with integrated circuit technology

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