A theoretical analysis based on the multiple scale method is presented for the behavior of the leaky wave in a corrugated ferrite image guide. the attenuation of the guided mode due to leakage is given analytically as a complex perturbation of the propagation constant. As an application of this structure, a millimeter wave leaky wave antenna has been considered and its radiation efficiency and directivity have been studied. Next, experiments are carried out for a leaky wave antenna using a poly‐crystalline YIG slab. the radiation pattern has been measured in the 40‐GHz band and compared with theoretical values. A change in dc magnetic bias by 1 Wb/m2 shifts the main beam to be scanned by 17.5 degrees. the experimental results agree well with theoretical data.
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