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New design of an effective device for protection against high power electromagnetic pulses has been created based on a pair of noninteracting microstrip resonators, which are coupled in the working fre quency band via a third resonator based on a thin film of high temperature superconductor (HTSC) occur ring in the superconducting state. Under the action of an electromagnetic pulse with the power above a cer tain threshold, the HTSC film element passes from the superconducting to normal (high resistivity) state, thus breaking the coupling between resonators. This leads to power limitation at the device output due to a strong signal reflection from the input.

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Abstract-A method aiming to widen the upper stopband in a microwave bandpass filter based on two-conductor suspended-substrate stripline resonators is described in this letter. Applicability of the method is illustrated by simulating and fabricating fourth-order filter that has a very wide upper stopband: Δf stop /f 0 = 7.92 measured at a level −50 dB, which is achieved because the widths of the inner resonators in the structure are 1.4 times greater than that of the outer ones.

A structure that consists of a λ/4 stepped-impedance microstrip resonator is proposed as an instrument for the investigation of nonlinear effects in thin magnetic films and also can be used as a microwave frequency doubler. A conversion efficiency of 0.65% is observed at a one-layer 100 nm Ni80Fe20 thin film at an input signal level of 4.6 W for a 1 GHz probe signal. The maximum measured conversion efficiency (1% at 1 GHz) was achieved for the 9-layer Ni80Fe20 film where 150 nm magnetic layers were separated by SiO2 layers.

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