3results about How to "High pattern purity" patented technology

This invention discloses a miniaturized four-channel combining module based on the TE20 mode, belonging to the field of millimeter-wave power combining technology. It includes a layered upper cavity, a mezzanine, a lower cavity, and an RF unit. The RF unit comprises a TE10-TE20 waveguide distributor, two amplification branches, and a TE20-TE10 waveguide combiner. Each amplification branch includes a TE20 mode filter, a waveguide-microstrip transition, a pair of amplifier chips, and a microstrip-waveguide transition connected sequentially. The TE10-TE20 waveguide distributor and the TE20 mode filter are disposed in the upper and lower cavities. The waveguide-microstrip transition, the pair of amplifier chips, and the microstrip-waveguide transition are disposed on opposite sides of the mezzanine. The TE20-TE10 waveguide combiner is disposed in the upper cavity, the mezzanine, and the lower cavity. This invention utilizes a high-isolation waveguide distributor / combiner to improve branch isolation, shorten the combining path, and has a compact overall structure with advantages such as wide bandwidth, high isolation, high combining efficiency, and miniaturization.

The invention discloses a symmetric quasi-optical cavity design method for dielectric constant measurement, which belongs to the technical field of quasi-optical cavity design and comprises a mirror design method and a coupling design method. The design method of the mirror is as follows: the quasi-optical cavity is composed of a transmission-type spherical mirror with a symmetrical structure, and parameters needing to be designed mainly comprise the curvature radius of the spherical mirror, the aperture radius of the spherical mirror, the distance between the two spherical mirrors and the material of the spherical mirror; factors considered during design comprise intrinsic spectral line purity, stability of an open cavity, an open cavity Q value and a girdling radius; the coupling design method comprises the following step of feeding a signal into and out of the symmetrical quasi-optical cavity by adopting a coupling ring mode. According to the design method of the symmetric quasi-optical cavity, the coupling ring is innovatively placed between the two spherical mirrors for signal feed-in / feed-out, a traditional fixed small hole coupling mode is replaced, the coupling strength of the coupling ring is flexibly adjusted through parameters such as the ring diameter, the wire diameter and the position, and the problems that after small hole coupling machining, adjustment cannot be conducted, and flexibility is poor are solved.

This invention proposes a few-mode fiber multiplexer with high coupling ratio and high mode purity, comprising a broadband mode selection coupler fabricated by polishing. The broadband mode selection coupler couples a few-mode fiber and a single-mode fiber. The core-cladding refractive index difference Δ of the few-mode fiber satisfies the formula Δ=b*sqrt(exp(-c*(r / d)^e)), where b∈[0.004,0.008], c∈[0.02,0.10], d∈[8,16], and e∈[6,14]. In the mode selection coupler, the remaining thickness after polishing is reduced by using graded-index few-mode fiber. The remaining thickness x from the cladding to the core edge after polishing is defined as the difference between the fiber cladding radius R, the core radius r, and the polished thickness a (x=R-r-a), ranging from 0.5 to 7.0 μm. This invention achieves a mode coupling efficiency greater than 80%, a mode purity greater than 88%, and a crosstalk between the output target mode and non-target modes less than -22.6dB, exhibiting characteristics of high coupling efficiency, low mode crosstalk, high mode purity, and high bandwidth.