Specific Millimeter-Wave Features of Fabry-Perot Resonator for Spectroscopic Measurements

Piksa, P.

doi:10.5772/9060

Cited by 3 publications

(4 citation statements)

References 10 publications

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“…The FP resonator, developed at the Department of Electromagnetic Field of the Czech Technical University in Prague, was equipped with the radial feeding (i.e., perpendicular to the resonator cavity) via thin dielectric coupling foil located in the middle of the resonator [Fig. 1(a)] [9]. The FP resonator is composed of two spherical mirrors for setting of particular resonance.…”

Section: Fabry–perot Resonatormentioning

confidence: 99%

“…Moreover, the transmissions and quality factors were evaluated all over the measured frequency range. During the transmission evaluation, the particular resonance was marked if the frequency of measured peaks met the resonance condition of the FP resonator (in the following figures, such frequencies are going to be highlighted by a red circle) [9]. In these resonance frequencies, the quality factor of each particular resonance was assessed (Figs.…”

Section: Axial Feeding Of Resonatormentioning

confidence: 99%

“…If the frequency stays below this value, the quality parameters and functionality of the resonator tend to fall rapidly as long as the frequency decreases. This is due to the diffraction loss [9, 10]. If the Fresnel number exceeds one, the diffraction loss is negligible (Fig.…”

Section: Introductionmentioning

confidence: 99%

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Improved axial feeding of Fabry–Perot resonator for high‐resolution spectroscopy applications

Cerny¹,

Piksa²,

Zvánovec³

et al. 2011

Micro & Optical Tech Letters

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This article presents the methods of broadband axial feeding of a Fabry-Perot resonator. The resonator was originally designed with the radial excitation for the absorption measurement in the frequency band ranging from 18 to 80 GHz. If the frequency stays below $26.4 GHz, the excitation of resonator is less satisfactory, since at the frequency in question, the value of Fresnel number of resonator drops to one. For the broadband measurement of gaseous samples' emission spectra, the excitations for frequencies lower than 26.4 GHz were analyzed using the capacitive coupling and two newly proposed couplings. V C 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53: [2456][2457][2458][2459][2460][2461][2462] 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26344Key words: Fabry-Perot resonator; axial excitation; absorption spectrum; emission spectrum; Fourier-transform microwave spectroscopy INTRODUCTIONOwing to its vital quality parameters, the Fabry-Perot resonator (hereinafter referred to as FP resonator or resonator) is frequently used in both spectroscopy applications-absorption and emission measurements [1][2][3]. In the high-resolution microwave spectroscopy, a usual absorption experiment is handicapped, for the low pressure of sample gas hinders collision relaxation processes. Furthermore, the probability of relaxation processes caused by spontaneous emission falls with the third power of the frequency [1][2][3][4][5][6][7]. This means that the saturation transitions (i.e., equalization of level populations) represent the main restriction to the high-resolution absorption spectroscopy used at the lowest frequencies (from the spectroscopic point of view, this refers to the frequencies of up to 80 GHz).The current research activities are targeted at the suppression of spectral lines broadening, which results from collisions of molecules. Indeed, the Fourier-transform microwave (FTMW) spectroscopy represents one of the most sensitive tools within the high-resolution microwave spectroscopy in the lowest measured frequency bands [1,2].In FTMW spectroscopy, the measured sample gas is excited by short pulses and, subsequently, the emission spectra can be measured [1,3]. Moreover, it is possible to inject the gas into the resonator in the direction of resonator axis by a high pressure [i.e., the supersonic gas expansion preventing collisions of molecule [6]; Fig. 1(b)]. Indeed, owing to the supersonic gas expansion, the spectral lines are narrowed and the sensitivity of spectra measurement is enhanced. Provided that the resonator shows a high quality factor, the field decay in the resonator is extended and the intensity sensitivity accordingly attains higher levels. However, at higher frequencies, a very short emission is observed, whereas at lower frequencies, it lasts for significantly longer time. Consequently, to ensure an emission measurement that is accurate and sensitive enough, it is necessary to determine the optimum loaded quality factor of resonator.This article sub...

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Section: Fabry–perot Resonatormentioning

confidence: 99%

Section: Axial Feeding Of Resonatormentioning

confidence: 99%

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Improved axial feeding of Fabry–Perot resonator for high‐resolution spectroscopy applications

Cerny¹,

Piksa²,

Zvánovec³

et al. 2011

Micro & Optical Tech Letters

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“…This technique has overcome several difficulties related to the narrow bandwidth and low antenna efficiency of patch array antennas, particularly when implemented at millimeterwave frequencies [3,4]. Applications of this type of antenna, including high-speed wireless local area networks, satellite reception, and various point-to-point radio links, have attracted much interest in recent years with regard to use in the upper microwave, millimeter-wave, and even terahertz regions [5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Design of a Low-Profile, High-Gain Fabry-Perot Cavity Antenna for Ku-Band Applications

Nguyen¹

2014

Journal of electromagnetic engineering and science

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A Fabry-Perot resonator cavity antenna for Ku-band application is presented in this paper. The Fabry-Perot cavity is formed by a ground plane and a frequency selective surface (FSS) made of a circular hole array. The cavity resonance is excited by a single-feed microstrip patch located inside the cavity. The measured results show that the proposed antenna has an impedance bandwidth of approximately 13% (VSWR≤2) and a 3-dB gain bandwidth of approximately 7%. The antenna produces a maximum gain of 18.5 dBi and good radiation patterns over the entire 3-dB gain bandwidth. The antenna's very thin profile, high directivity, and single excitation feed make it promising for use in wireless and satellite communication applications in a Ku-band frequency.Key Words: Directive Antenna, Fabry-Perot Resonator, Frequency Selective Surface. This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/ by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. ⓒ

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Phenomenological model and experimental study of DNA absorption spectra in THz range

et al. 2017

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Specific Millimeter-Wave Features of Fabry-Perot Resonator for Spectroscopic Measurements

Cited by 3 publications

References 10 publications

Improved axial feeding of Fabry–Perot resonator for high‐resolution spectroscopy applications

Improved axial feeding of Fabry–Perot resonator for high‐resolution spectroscopy applications

Design of a Low-Profile, High-Gain Fabry-Perot Cavity Antenna for Ku-Band Applications

Phenomenological model and experimental study of DNA absorption spectra in THz range

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