Gaussian-beam open resonator with highly reflective circular coupling regions

Matsui, Toshiaki; Araki, Koji; Kiyokawa, M.

doi:10.1109/22.247915

Cited by 22 publications

(9 citation statements)

References 6 publications

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“…2) Radiated Fields, Directivity, and Gain: A GBA (without its feeding system) is a dielectric-loaded compact open resonator with mesh mirrors [32]. The full electromagnetic field equations of the radiated TEM beam wave have been derived by Cullen et al [33] using the complex source-point method [a time dependence in is assumed]…”

Section: A Principles and Quasi-optical Performance Of Gbasmentioning

confidence: 99%

Radiation characteristics and performance of millimeter-wave horn-fed gaussian beam antennas

Sauleau

Coquet

Thouroude

et al. 2003

IEEE Trans. Antennas Propagat.

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Radiation characteristics and performance of Gaussian beam antennas (GBAs) are studied theoretically and experimentally in the 60-GHz band. A GBA consists of a plano-convex half-wavelength Fabry-Perot (FP) resonator excited by a guided source with a metal flange. Two reflecting metal mesh mirrors are formed on both faces of the cavity. After a review of the principles and quasi-optical performance of plano-convex FP resonators illuminated by a plane wave, a new formulation is proposed to compute radiation patterns of GBAs: the usual expression of the waist radius inside open resonators is modified to account for the horn aperture and for the grid parameters of the plane mirror. Standard closed-form relations of vector Gaussian beams are then used to compute the radiated copolar components. In particular, it is shown that the plane mirror is not an equiphase surface, due to the metal flange of the horn. The true phase distribution is approximated by a spherical wavefront. As a result, the directivity of the antenna becomes lower than its quasi-optical value. Experimental data obtained at 60 GHz with several pyramidal horns and various cavities agree very well with the theory. Sidelobes are lower than 25 dB, and the cross-polarization level is the same as that of the primary radiator. Universal curves showing the variations of resonant frequency, 3 dB bandwidth, gain, and radiation efficiency as a function of mirror reflectivity are very useful for the design of GBAs.Index Terms-Fabry-Perot cavity, focusing by a phase variation, Gaussian beam antenna.

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Section: A Principles and Quasi-optical Performance Of Gbasmentioning

confidence: 99%

Radiation characteristics and performance of millimeter-wave horn-fed gaussian beam antennas

Sauleau

Coquet

Thouroude

et al. 2003

IEEE Trans. Antennas Propagat.

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“…However, the effect is a small one as long as the resonator is operated within the ''stable'' region. 18,29 One must have the ability to vary the mirror separation in order to tune for resonance, and to independently alter the height from the sample to the bottom mirror in order to place an aqueous sample at an E-field node. For our experiments the mirror separation was kept as close to 8 mm as possible and the effect of the beam waist on the sensitivity was ignored.…”

Section: Design and Experimentsmentioning

confidence: 99%

Aqueous sample holders for high-frequency electron spin resonance

Barnes

Freed

1997

Review of Scientific Instruments

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Articles you may be interested inHigh field electron paramagnetic resonance spectroscopy under ultrahigh vacuum conditions-A multipurpose machine to study paramagnetic species on well defined single crystal surfaces Rev. Sci. Instrum. 85, 083903 (2014); 10.1063/1.4893729 A quasioptical transient electron spin resonance spectrometer operating at 120 and 240 GHz Rev. Sci. Instrum. 76, 074101 (2005);A quasioptical approach is utilized to design a resonator and sample holder for aqueous samples for high-frequency ͑250 GHz͒ electron spin resonance ͑ESR͒ spectroscopy. A disk shaped sample geometry was chosen to match the field contours of the fundamental mode in a Fabry-Perot resonator. A transmission-line analysis is used to determine the optimum sample geometry while taking into account diffractive effects of the sample and the sample holder on the far infrared ͑FIR͒ radiation field. FIR-ESR spectra of several aqueous solutions of nitroxide spin labels, including membrane vesicles and a labeled protein, are shown to demonstrate the success of the technique.

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“…1. It uses an open resonator consisting of a plane mirror substrate and a concave spherical mirror with a highly reflective, partially transparent region [5]. To provide coupling, a metal stripe pattern was formed by a photolithography process on a circular area in the center of the spherical mirror ( Fig.…”

Section: Oscillator Configurationmentioning

confidence: 99%

“…In this letter, a Gaussian output-beam oscillator using a new quasi-optical resonator [5] is proposed. Moreover, when integrating an oscillator with other circuits, e. g., modulation or baseband circuits, a configuration with an active circuit behind the resonator is powerful.…”

Section: Introductionmentioning

confidence: 99%

A new quasi-optical oscillator with Gaussian output beam

Kiyokawa

Matsui

1994

IEEE Microw. Guid. Wave Lett.

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An oscillator with a new quasi-optical resonator, called a Gaussian-beam oscillator, is described. The resonator consisits of a plane mirror substrate and a concave spherical mirror with a highly reflective, partially transparent region. A high Q factor, obtained by this spherical mirror, results in a low phase noise of the oscillator and the output power is extracted from this region as a Gaussian beam. This oscillator also features an active circuit fabricated behind the resonator. The configuration is suitable for millimeter-wave integrated circuits. Experimental validity is carried out from an X-band prototype.

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Gaussian-beam open resonator with highly reflective circular coupling regions

Cited by 22 publications

References 6 publications

Radiation characteristics and performance of millimeter-wave horn-fed gaussian beam antennas

Radiation characteristics and performance of millimeter-wave horn-fed gaussian beam antennas

Aqueous sample holders for high-frequency electron spin resonance

A new quasi-optical oscillator with Gaussian output beam

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