5results about How to "Increased Polarization Purity" patented technology

This invention discloses a dual-substrate circularly polarized reconfigurable omnidirectional antenna based on PIN diode control. The antenna comprises a first substrate and a second substrate. The second substrate has a ground plane printed on it, and the first substrate has a radiating patch printed on it. The radiating patch includes a central square patch, a Γ-shaped stub, a loop antenna, PIN diodes, and via shorting posts. Seamless switching between left-hand and right-hand circular polarization is achieved through the on / off combinations of 16 PIN diodes, with a simple switching logic. High polarization purity is achieved in both polarization modes, and the via shorting posts effectively reduce mutual interference between modes, resulting in strong switching reliability. In both circular polarization modes, the relative impedance bandwidth and axial ratio bandwidth are wide. In the left-hand circular polarization mode, the relative impedance bandwidth reaches 19.38%, covering 2.33-2.83GHz with |S11|<-10dB, and the axial ratio bandwidth reaches 26.3%, covering 2.08-2.71GHz with AR<3dB. In the right-hand circular polarization mode, the relative impedance bandwidth reaches 19.8%, covering 2.32-2.83GHz with |S11|<-10dB, and the axial ratio bandwidth reaches 23.43%, covering 2.11-2.67GHz with AR<3dB, which is significantly better than existing narrowband designs of the same type.

The utility model relates to the technical field of micro-nano optics, in particular to a light field switching device and a light field switching and characterization system. The light field switching device comprises a laser, an optical parametric oscillator, a three-dimensional moving table, a substrate and an oil-immersed objective lens fixed on the three-dimensional moving table, the laser, the optical parametric oscillator, the three-dimensional moving table and the substrate are sequentially arranged, a metal film layer is plated on one side of the substrate, and the three-dimensional moving table is configured to bear the oil-immersed objective lens to move relative to the substrate. The three-dimensional moving table is moved to drive the oil-immersed objective lens to move, so that the relative distance between the focus of the oil-immersed objective lens and the metal film layer on the substrate is changed, the focusing degree of the exciting light is controlled, the exciting light focused by the oil-immersed objective lens and the metal film layer are subjected to different reactions, and different fields to be measured are generated. A user can quickly switch different tight focusing light fields and surface plasmon polariton fields only by adjusting the three-dimensional mobile station, and when parameters of incident light are changed, the switching device is still applicable and has high reusability.

The optical fiber current transformer comprises a light source module, a polarization module, a modulation module, a double-light-path delay module, a sensing module and a signal processing module which are sequentially connected through a light path, wide-spectrum light emitted by the light source module enters the double-light-path delay module after being introduced into a modulation phase through the modulation module, a first polarization beam splitter in the double-light-path delay module separates input light into a pair of orthogonal polarized light, and the orthogonal polarized light is respectively sent into an upper branch delay optical fiber light path and a lower branch delay optical fiber light path for transmission. The second polarization beam splitter re-combines the two paths of light of the upper branch light path and the lower branch light path into one path of light signal, the light signal enters the sensing module to carry current information to be detected, the light signal is reflected by a reflecting element at the tail end of the sensing module and then returns along the original light path, interference occurs at the polarization module, and the light detector converts the interference light intensity into an electric signal to obtain the current information to be detected.

The application relates to the technical field of broadband array antennas, and particularly discloses a 6GHz-18GHz wide-angle scanning high-polarization-purity horn array antenna which comprises a metal horn body and a plurality of coaxial connectors; the metal horn body comprises two groups of symmetrically arranged side cover plates and a double-ridge cavity body; the double-ridge cavity body comprises a plurality of groups of wide-side walls connected with the two groups of side cover plates, double-ridge structures located between adjacent two groups of wide-side walls, a barret structure arranged at the bottom of the double-ridge structures and a floor plate connecting the double-ridge structures, the wide-side walls and the cover plates into an integrated whole; the application effectively realizes a broadband array with high polarization purity in a 6GHz-18GHz frequency range within a scanning range of + / -60 degrees; the cross-polarization suppression in the 6GHz-18GHz frequency band within the scanning range of + / -60 degrees is greater than 40dB, and the normal cross-polarization suppression is greater than 50dB.

This utility model discloses a circularly polarized electrically tunable antenna, including a mounting plate, a radio frequency receiver, a filter, a power divider, N phase shifter assemblies, N+1 radiating elements, and a phase adjustment mechanism. The N phase shifter assemblies are located on the front of the mounting plate, and the N+1 radiating elements are located on the back of the mounting plate. The radio frequency receiver is connected to the input of the filter, and the output of the filter is connected to the input of the power divider. One output of the power divider is connected to one radiating element, and the other outputs of the power divider are connected to the remaining N radiating elements after passing through the N phase shifter assemblies. The phase adjustment mechanism is connected to the phase adjustment sections of the N phase shifter assemblies, and is used to synchronously adjust the phase of the N phase shifter assemblies. The phase adjustment mechanism synchronously drives multiple phase shifter assemblies to achieve global phase consistency of the array. A mechanical linkage method using a transmission rod and guide block ensures the synchronicity of the adjustment actions of each phase shifter.