A new method for the computation of the insertion loss of magnetostatic-surface wave transducers

Abstract

A method is shown for the computation of the insertion loss of magnetostatic-surface wave transducers. In the first step of the method, a closed-form expression is derived for the solution of the telegrapher's equations for the microstrip transducers. The insertion loss is then obtained from this solution as a function of three transmission line parameters, i. e., the propagation constant and the characteristic impedance of the YIG-loaded microstrip line and the mutual inductance between the two microstrips. In the second step, these transmission line parameters are numerically computed by applying a full-wave method of moments technique. The theoretical results obtained have been found to be in good agreement with experimental results.

Coupled Micromachined Magnetic Resonators for Microwave Signal Processing

“…Especially for the band-stop configurations, an SER top-coupled to a microstrip can be easily obtained to fulfill critical matching (50 ohms) conditions or different impedances if needed. The full modeling of the multilayer made by a grounded dielectric (typically alumina) and a microstrip loaded by a magnetic film epitaxially grown on a GGG substrate has been known since the 1970s, described in seminal papers like [42][43][44], reviews on applications [45], and further design developments from many authors after that [46][47][48][49][50]. Nanometer-thick films could also be excited by proper transducer design, but in these cases, the number of spins involved is lower because of a smaller volume, and the coupling efficiency limits the quality factor of a resonator to a few hundred units (Q ≈ 350) [51], while for notch filters and oscillators, Q-values exceeding 1000 are more desirable.…”