Тип публикации: статья из журнала
Год издания: 2016
Идентификатор DOI: 10.1109/TASC.2016.2530700
Ключевые слова: Microstrip structure, microwave (MW), power limiter (PL), transmission zero, microwave, power limiter, transmission zero, Bandwidth, Electric load loss, High temperature superconductors, Microwave filters, Microwaves, Resonators, Semiconductor metal boundaries, Superconducting materials, Superconducting resonators, Wave transmission, Coupling coefficient, Fractional bandwidths, High temperature superconducting films, Operating frequency, Power limiters, Switching elements, Transmission loss, Transmission zeros, Microstrip filters
Аннотация: This paper presents a new type of power limiter (PL), using superconducting-to-normal state phase transition in high-temperature superconductor. The presented device differs from the existing ones mainly in the reflective principle of its operation. In fact, the PL is a three-resonator microstrip filter, whose resonators are configured and arranged in such a manner that coupling coefficient between the outer resonators is equal to zero and the inner one has a gap in the middle section shunted by a high- temperature superconducting (HTS) film element. In small-signal mode, the HTS element is in low-loss state, and the device is essentially a three-pole filter with low transmission loss. When the level of the signal exceeds the threshold, the HTS element transits to the high- loss state, and the Q-factor of the inner resonator falls, breaking the coupling in the structure. This leads to the corresponding increase in the PL's transmission loss due to reflection. The higher the level of incoming power, the more the Q-factor falls. The PL operating frequency is 8 GHz with 8.5% fractional bandwidth. It remains operable up to 40 W of input power, providing 38-dB limitation.
Журнал: IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
Выпуск журнала: Vol. 26, Is. 6
ISSN журнала: 10518223
Место издания: PISCATAWAY
Издатель: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
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