Tunable Planar Air-Core Resonator Based on Tunable Hollow Waveguide
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Abstract:
We propose and demonstrate a novel tunable planar air-core Fabry–Perot resonator for tunable wavelength filters based on hollow waveguides. The resonator consists of two circular grating mirrors and an air cavity based on a slab hollow waveguide, and light is confined three-dimensionally in the air-core cavity. Changing the air-core thickness of the hollow waveguide enables us to achieve a large propagation constant change on the order of 10%, which would be useful for widely tunable filtering applications. We fabricate two kinds of planar air-core resonators with 1-mm-long and λ/4-long air-cavities, respectively. We evaluate its grating mirror reflectivity and demonstrate tunable filter applications. The footprint of the fabricated λ/4 air-cavity resonator is only 0.1 mm2 and the resonator exhibits a quality factor of 3220 and 9 nm wavelength tunability of resonant cavity modes.Keywords:
Waveguide
Helical resonator
Two different kinds of dynamic stable resonator—the resonator insensitive to axial shift of the mirrors of the resonator, and the resonator insensitive to thermo-perturbation of the thermo-lens in the resonator—and their general criteria are distinguished in detail. At the same time both coincident conditions are also discussed.
Helical resonator
Dielectric resonator antenna
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Mistakes can be made easily when caculating the equivalent resonator length of coaxial sperical resonator,and these are pointed out and analysed through an example in this paper.The conceptions about the equivalent resonator length,optical resonator length and geometric resonator length are distinguished clearly,which are subjected to confuse with each other.The interpretation of the conception of equivalent resonator,which is that the equivalent resonator length of coaxial sperical resonator equals to the resonator length of G parameters equivalent resonator,is given either.These are helpful to students' comprehension.
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Coaxial
Dielectric resonator antenna
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The vibrating characteristics are analyzed on the resonator of hemispherical resonator gyro with the software ANSYS. The finite element model of the Ψ-shaped hemispherical shell resonator is established. The natural frequency and the mode of the above resonator are calculated. On the basis of the analyses of vibration features of the resonator, the proper suggestions for engineer design of the Ψ-shaped hemispherical shell resonator are made in this paper.
Helical resonator
Dielectric resonator antenna
Natural frequency
Mode (computer interface)
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Abstract To increase the signal to noise ratio, helical resonator is generally employed in between trap signal pick up electrode and Low noise amplifier having high input impedance. Based on available literature and simulation study, a 20MHz Helical resonator was designed and fabricated. The measured resonant frequencyand quality factor of the fabricated resonator is 19.67 MHz and 1030 respectively. Simulation results are found in good agreement with the fabricated resonator parameter. Effect of material’s conductivity on the quality factor of the resonator is also studied.
Helical resonator
Q factor
Dielectric resonator antenna
SIGNAL (programming language)
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The analysis of TE modes in a composite multilayered cylindrical dielectric resonator is presented. All cylindrical dielectric resonator structures which have found some practical applications can be treated as a special case of the structure under consideration. These include: single resonator, double resonator, ring resonator, resonator in microstrip, inhomogeneous resonator and others. A new rigorous method of determining the field distribution and resonant frequency of this resonator is presented. By this method the solution is obtained in a form of successive approximations converging to an exact solution. The analysis is applied in detail to the lowest frequency TE mode of double dielectric resonator.
Helical resonator
Dielectric resonator antenna
Dielectric resonator
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This letter presents a novel high Q resonator. The measurement of the resonator itself shows that the suggested resonator provides a higher loaded quality factor with reduced circuit area compared to the conventional hairpin resonator. The size of the miniaturization SIR resonator reduces to 25% of the size of conventional hairpin SIR resonator. The resonators are designed to operate at 10.0GHz and 9.9GHz using the conventional and novel miniaturization SIR resonator to compare the quality factor performance. The simulation shows novel resonator can achieve better performances compared with conventional hairpin resonator but with smaller size. The loaded quality factor of the novel resonator shows 215, which is better than that of the conventional resonator by 93.
Helical resonator
Dielectric resonator antenna
Q factor
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We propose a design for an optical resonator suited to using large-bore active media. The resonator consists of a pair of waxicons, so we call it a "wwaxicon optical resonator." The resonator is considered a conventional (solid) resonator surrounded by coaxial annular resonators. A numerical simulation of the resonator designed for use in a commercial CO2 laser is performed. It is found that parasitic oscillation modes can be suppressed by the use of an spatial-frequency filter. The resonator exhibits oscillation in the TEM*01 transverse mode and produces twice as much output power as a sevenfold multipass stable optical resonator.
Helical resonator
Dielectric resonator antenna
Optical cavity
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Transverse mode
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A new type of the laser resonator, the unstable resonator with a stable resonator core, is proposed. The simple analysis using Kirchhoff diffraction equation revealed that this resonator is suitable for the low gain, large aperture laser medium such as the chemically pumped oxygen-iodine laser.
Helical resonator
Dielectric resonator antenna
Aperture (computer memory)
Optical cavity
Output coupler
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The thermal stability of resonator is mainly decided by the structure of resonator;the expansion temperature coefficient of the material of resonator,and the material electrical character variety with temperature.An absorption coaxial resonator was taken as an example in this paper to analyze the stability of resonator.By using the relative temperature sensitiveness of the resonator different part,methods to get a high thermal stability resonator by the means of using proper material of the different part of the resonator were proposed.
Helical resonator
Coaxial
Dielectric resonator antenna
Thermal Stability
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