Multipassband electronically tunable magnetostatic wave filter

A new design for a multipassband microwave filter based on magnetostatic waves propagating in a multilayer planar ferrite structure is described. The experimentally realised filter had two passbands of 10 MHz bandwidth and 5–6 dB insertion loss separated by 400 MHz, and was tuned with an external magnetic field over the 2.5–4 GHz range.