A new type of microwave-excited atmospheric-pressure plasma (APP) generator that uses the principle of a strip-line transmission line resonator is presented. The microwave plasma has a length of 30 mm, so it can treat a wide area at the same time. The impedance of the resonator was matched to $50~\Omega $ without additional matching equipment by exploiting characteristic of quarter wavelength transmission line. The design of the resonator was double-checked by computer simulation for the purpose of generating stable microwave APP. Microwave plasma discharge of the resonator was operated with argon gas flow of 1 slm, net power of 2.3 W, and resonance frequency of 2.41 GHz. The plasma gas temperature was maintained below 40 °C for 30 min, so it is safe to use in biomedical applications. The intensity of optical emission spectrum was higher at the center than edges. The average of electron excitation temperature was 0.78 eV with a standard deviation of 0.03 eV (3.85%) in 20-mm range. Increase in the amount of reactive oxygen and nitrogen species expressed in the normal human dermal fibroblast cells after plasma treatment was confirmed using fluorescent reagent. This new type of microwave atmospheric plasma resonator is expected to be useful in various biomedical fields.

中文翻译：

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使用线性微波大气压力等离子体发生器的等离子体诊断和生物医学应用

提出了一种利用带状线传输线谐振器原理的新型微波激发大气压等离子体(APP)发生器。微波等离子体的长度为30毫米，因此可以同时处理大面积。利用四分之一波长传输线的特性，无需额外的匹配设备，谐振器的阻抗匹配到$50~Ω$。为了产生稳定的微波APP，谐振器的设计通过计算机模拟进行了双重检查。谐振器的微波等离子体放电在氩气流量为 1 slm、净功率为 2.3 W 和谐振频率为 2.41 GHz 的条件下运行。等离子气体温度保持在 40 °C 以下 30 分钟，因此可安全用于生物医学应用。光发射光谱的强度在中心高于边缘。电子激发温度的平均值为 0.78 eV，在 20 毫米范围内的标准偏差为 0.03 eV (3.85%)。使用荧光试剂证实等离子体处理后正常人真皮成纤维细胞中表达的活性氧和氮种类的量增加。这种新型微波大气等离子体谐振器有望用于各种生物医学领域。