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Schematic of the side-cavity-coupled edge state waveguide formed by the interface between a YIG PC (left-bottom) and an alumina PC (right-up), which are surrounded by microwave absorbing materials.
Calculated [(a); (c)] and measured [(b); (d)] spectrum for the side-cavity coupled one-way waveguide. Both forward [(a) and (b)] and backward [(c) and (d)] spectra are shown. The width of the cavity is changed by shifting four lateral rods [denoted with blue color in (e) and green in (f)] with a length of .
The electric field intensity distribution for the waveguide-cavity system at the resonance frequency of 14.7 GHz.
Calculated band structure of the one-way waveguide with a width of (a) and (b). The black solid circle denote the eigenmodes of the two PCs. The red symbol-lines represent the forward guided modes, and the blue ones are the backward modes.
(a) The coupling between a cavity and a pure one-way waveguide . (b) A channel-drop filter made from two unidirectional waveguides and a cavity.
The calculated transmission spectra near the resonate frequency for the four port filter. (a) The schematic picture of the four-port CDF. (b) The relative transmittance of the three output ports; (c) Relationship of the Q factor with the thickness (i.e., D) of the cavity wall. (d) Influence of the material loss on the filter.
(a) Experimental and (b) calculated transmission spectra of the four port unidirectional CDF.
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