Split-ring resonator microplasma: microwave model, plasma impedance and power efficiency
Year: 2005
Type: article
Abstract: The microstrip split-ring resonator (MSRR) microplasma source is analysed\nand characterized using a microwave model of the device. Throughout the\ndiscussion, experimental data for three MSRR designs are also presented.\nThe model identifies the key parameters that control the performance of the\ndevice and results in the formulation of closed-form expressions useful for\ndesigning, analysing and comparing MSRR designs. Matching the\nmicrostrip characteristic impedance to the microplasma impedance is found\nto be a key factor in the performance of these devices and it can be even\nmore critical than the quality factor of the ring resonator. Based on the\nmodel, average rf electric fields of up to 4MVm−1 at 1Wof input power are\nestimated to be generated in a 45μm gap device. Furthermore, the model is\nused to determine the plasma impedance and thereby obtain information on\nphysical properties of the microdischarge. Electron densities of the order of\n10(14) cm−3 are estimated in a 1W argon discharge at atmospheric pressure.\nBased on the values of the plasma impedance, it is also determined that up to\n70% of the power input to the MSRR is coupled to the electrons in the\nmicrodischarge.
Language: English
Subfield: Radiology, Nuclear Medicine and Imaging
Field: Medicine
Domain: Health Sciences
Open Access status: green
OpenAlex ID: W2011171910