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In this letter, a magnetically controlled surface-loaded ferrite single pole single through (SPST) switch is presented. The ferrite slab is loaded on the broad wall surface of a substrate integrated waveguide (SIW). When a dc magnetic bias is applied to the ferrite slabs, the effective permeability of the ferrite becomes negative. In this case, the wave will be cut off. After investigating the design principle, an X-band switch prototype is fabricated and measured. Its insertion loss is less than 1.6 dB, return loss is better than 15 dB, and isolation is better than 27 dB in a frequency range from 9.5 to 11 GHz.Index Terms-Substrate integrated waveguide (SIW), surfaceloaded ferrite, switch.

An X-band ferrite-loaded half mode substrate integrated waveguide (HMSIW) phase shifter is proposed and fabricated in this paper. A full-height E-plane Yttrium Iron Garnet (YIG) ferrite slab is embedded in the HMSIW to construct the non-reciprocal phase shifter. With the application of a magnetic bias field on the ferrite slab, the phase of the ferrite-loaded HMSIW can be adjusted and controlled. For a magnetic bias field of 1800 Gauss, the insertion loss is less than 3.2 dB from 9.7 to 11.0 GHz. The return loss is better than 10 dB over the same frequency range. The largest differential phase shift can be up to 337 • . This circuit is easily integrated with other planar components and also has the capability to handle medium power level.

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