Dielectric Coupler for General Purpose Q-Band EPR Cavity

AbstractHere, we report on a robust and efficient mechanism for tuning the microwave coupling of a Q-band (34 GHz), general purpose, cylindrical EPR cavity operating in the TE011 mode. This novel mechanism allows for both the adjustment of the cavity’s coupling over a wide frequency range, as well as its bandwidth from that of a high-Q cavity (about 10 MHz), to a broadband cavity (above 1 GHz). The coupling element consists of a dielectric plate fixed onto a movable waveguide short that allows for two modes of operation. In the first mode, the dielectric plate does not influence the resonance properties of the coupling iris and allows for precise, critical coupling of the high-Q cavity. In the second mode, the dielectric plate is positioned in front of the coupling iris, varying the iris’ resonance properties and allowing very strong overcoupling to be achieved. This mechanism can be generalized for other types of EPR cavities, in particular at high microwave frequencies.

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A novel high-Q and wide-frequency-range inductor using Si 3-D MMIC technology

IEEE Microwave and Guided Wave Letters ◽

10.1109/75.752110 ◽

1999 ◽

Vol 9 (1) ◽

pp. 16-18 ◽

Cited By ~ 18

Author(s):

K. Kamogawa ◽

K. Nishikawa ◽

I. Toyoda ◽

T. Tokumitsu ◽

M. Tanaka

Keyword(s):

Wide Frequency Range ◽

Frequency Range ◽

High Q

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SURFACE LOSSES IN ELECTROMAGNETIC CAVITY RESONATORS

Canadian Journal of Physics ◽

10.1139/p52-018 ◽

1952 ◽

Vol 30 (3) ◽

pp. 174-184

Author(s):

I. Paghis

Keyword(s):

Skin Resistance ◽

Normal Modes ◽

Relaxation Method ◽

Theoretical Work ◽

Wide Frequency Range ◽

Frequency Range ◽

Cavity Resonators ◽

Microwave Frequencies ◽

Surface Work ◽

Effect Of Surface

The effective skin resistance of brass has been determined at microwave frequencies, by means of Q measurements. Refinements have allowed the Q measurements to be made with an accuracy of the order of 0.3% over a wide frequency range. The measured values are in essential agreement with theoretical prediction, provided that surface treatment is confined to slow hand polishing. This agreement holds for relaxation calculations on re-entrant type resonators, as well as for rigorously soluble resonators. An attempt has been made to correlate the surface roughness of a resonator with the effective skin resistance. The results obtained are in agreement with theoretical work. The effect of surface scratches is small when compared with the effect of a distortion in the crystal lattice at the surface of the brass, due to surface work. The perturbation of the field distribution of the normal modes by wall losses is usually assumed to be negligible. A calculation by the relaxation method shows that, for the best conductors at room temperatures, the perturbation of the normal modes may become serious at millimeter wave lengths.

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A ring oscillator with very low phase noise and wide frequency range using carbon nanotube technology for PLL applications

Analog Integrated Circuits and Signal Processing ◽

10.1007/s10470-021-01824-z ◽

2021 ◽

Author(s):

Hamed Sarbazi ◽

Reza Sabbaghi-Nadooshan ◽

Alireza Hassanzadeh

Keyword(s):

Carbon Nanotube ◽

Phase Noise ◽

Wide Frequency Range ◽

Ring Oscillator ◽

Frequency Range ◽

Carbon Nanotube Technology ◽

Low Phase Noise

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Experimental Study of Bandstop Filter, Tunable in Wide Frequency Range by Electromagnetic System, Containing Samarium Cobalt Permanent Magnets

2020 International Conference on Actual Problems of Electron Devices Engineering (APEDE) ◽

10.1109/apede48864.2020.9255652 ◽

2020 ◽

Author(s):

M.D. Atoev ◽

R.K. Babichev ◽

I.I. Natkhin

Keyword(s):

Experimental Study ◽

Permanent Magnets ◽

Wide Frequency Range ◽

Frequency Range ◽

Electromagnetic System ◽

Bandstop Filter

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High-Q-Factor Tunable Silica-Based Microring Resonators

Photonics ◽

10.3390/photonics8070256 ◽

2021 ◽

Vol 8 (7) ◽

pp. 256

Author(s):

Yue-Xin Yin ◽

Xiao-Pei Zhang ◽

Xiao-Jie Yin ◽

Yue Li ◽

Xin-Ru Xu ◽

...

Keyword(s):

Optical Communications ◽

Microring Resonator ◽

Microring Resonators ◽

Q Factor ◽

Notch Depth ◽

Critical Coupling ◽

Practical Application ◽

Coupling Condition ◽

High Q ◽

Racetrack Resonator

A high-Q-factor tunable silica-based microring resonator (MRR) is demonstrated. To meet the critical-coupling condition, a Mach–Zehnder interferometer (MZI) as the tunable coupler was integrated with a racetrack resonator. Then, 40 mW electronic power was applied on the microheater on the arm of MZI, and a maximal notch depth of about 13.84 dB and a loaded Q factor of 4.47 × 106 were obtained. The proposed MRR shows great potential in practical application for optical communications and integrated optics.

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