Wideband Microwave Photonic Circulator Using Two Asymmetric Partial-Height Triangle Ferrites

Abstract

Broadband 5G communication requires the operation of nonreciprocal devices in the Ku band. A wideband photonic crystal circulator is implemented by introducing two partial-height triangular Ni-Zn ferrites into the Al2O3 ceramic rod-arrays. The asymmetric sizes of the two equilateral triangles paired with self-matching effectively extend the bandwidth of the circulator eight times over that of the symmetric scheme. Numerical simulations demonstrate that the photonic crystal circulator can obtain a bandwidth of 1.00 GHz with an isolation 25.75 dB and an insertion loss 0.381 dB through optimized matched triangle size ratio, suitable for applications in future communication systems.

Terahertz Polarization Isolator Using Two-Dimensional Square Lattice Tellurium Rod Array

“…Based on the magnetic resonance absorption effect, the maximum isolation and relative bandwidth were optimized to 49.49 dB and 8.85%, respectively. A wideband microwave photonic circulator depending on the light local effect [ 9 , 10 ] and Faraday rotation effect [ 11 ] was numerically investigated by inserting two asymmetric triangular ferrite sheets into a Y-shaped PhC waveguide [ 12 ]. The external characteristics of the devices in [ 11 , 12 ] were simulated by the finite element method (FEM) using software called Comsol Multiphysics, which is a numerical analysis technique used to solve complex engineering and scientific problems.…”

“…A wideband microwave photonic circulator depending on the light local effect [ 9 , 10 ] and Faraday rotation effect [ 11 ] was numerically investigated by inserting two asymmetric triangular ferrite sheets into a Y-shaped PhC waveguide [ 12 ]. The external characteristics of the devices in [ 11 , 12 ] were simulated by the finite element method (FEM) using software called Comsol Multiphysics, which is a numerical analysis technique used to solve complex engineering and scientific problems. It discretizes a continuous problem and divides the solution field into a finite number of small, non-overlapping units, then approximates each unit, and finally combines the solutions of all units to obtain the solution of the whole problem.…”