Current density and power handling of high-temperature superconductive thin film resonators and filters

Abstract

This paper presents experimental and theoretical results for a number of high-temperature superconductive (HTS) planar thin film filters and resonators. The circuits were manufactured using TBCCO films. The measured maximum power handled by each assembled filter and resonator was correlated with the maximum normalized current density predicted by a commercially available software package. The results achieved were used to deduce the critical current density in each HTS device. The data demonstrates that it is possible to predict the power-handling capability of new filter designs by analyzing the results of the current density simulation. Manufacturing and testing resources can thus be limited to those HTS circuit designs which show the greatest potential for high-power handling.

Design and Implementation of an RF Coupler Based on YBCO Superconducting Films

“…We evaluated the current densities for both using theoretical and practical approaches. A correlation between current density and RF power can be found in [9]. The total AC current flowing in a micro strip of width W and surface current per unit length J s , can be calculated by:…”

A New Low-Loading HTS Current Switch Triggered by RF Signals

“…The observation of the nonlinearity of power handling capacities and Jc, with different geometry HTS circuits, led to the understanding of the uneven distribution of RF current in HTS materials [25], [26]. The transition of HTS from superconductivity to the normal state has been observed in RF applications [27] in which the insertion loss in the HTS filter increases dramatically over a certain critical point.…”

HTS narrowband stripline filter at 2.1 GHz with high power handling capability

“…At 2 GHz on LaAlO 3 substrate, the TM 010 mode ring resonator has a diameter of about 37 mm [2] and the dual mode patch resonator has a size of about 15 mm ϫ15 mm [5]. Although TEM mode microstrip resonator has a compact size at low frequency, narrowband high power filters designed with this mode are limited in lower pole [6,7]. Because of wide microstrip lines and large spacings between resonators in narrowband high power filter, it cannot fit high pole filter in a 5-cm diameter substrate.…”