摘要 :
Optical filters having at least two coupled whispering-gallery-mode (WGM) optical resonators to produce a second order or higher order filter function with a desired spectral profile. At least one of the coupled WGM optical resona...
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Optical filters having at least two coupled whispering-gallery-mode (WGM) optical resonators to produce a second order or higher order filter function with a desired spectral profile. At least one of the coupled WGM optical resonators may be tunable by a control signal to adjust the filtering function.
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摘要 :
Directional couplers for transverse electric (TE) modes are described which selectively pick one mode from a mode mixture in an overmoded circular waveguide system. Unwanted modes are statistically nulled out in the coupling waveg...
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Directional couplers for transverse electric (TE) modes are described which selectively pick one mode from a mode mixture in an overmoded circular waveguide system. Unwanted modes are statistically nulled out in the coupling waveguide. Mode selectivity and directivity oscillate up and down with an increasing number of holes and finally reach approximately the 20 dB mark. A directional coupler for the TE sub 02 mode (28 GHz, 63.4 mm circular waveguide) with 41 holes and a length of 1.6 m shows a directivity of 68 dB and suppresses TE sub 01 with 58 dB, TE sub 03 with 28 dB, TE sub 04 with 34 dB, TE sub 22 with 37 dB, and further modes TEsub(lm)(l<5, m<6) with 17 dB to 34 dB. (ERA citation 10:033002)
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摘要 :
Short mode selective directional couplers for transverse electric (TE) modes travelling in overmoded circular waveguides are described. Directivity is achieved by pairs of holes with destructive interference in backward direction,...
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Short mode selective directional couplers for transverse electric (TE) modes travelling in overmoded circular waveguides are described. Directivity is achieved by pairs of holes with destructive interference in backward direction, unwanted modes are suppressed by destructive interference in either directions of the coupling guide. A 28 GHz narrow directional coupler for the TE sub 01 mode (63.4 mm waveguide diameter) with 16 holes and a length of 230 mm shows a directivity of 55 to 100 dB between 27.9 and 28.1 GHz, suppressing the TE sub 02 mode with 35 to 80 dB, the TE sub 03 mode with 30 to 65 dB, and the TE sub 22 mode with 30 to 70 dB. (ERA citation 10:033003)
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摘要 :
We present the results of calculation of transverse mode coupling instability (TMCI) thresholds for Very Large Hadron Collider (VLHC). The estimates are done with use of conventional approach and more sophisticated mode dynamics a...
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We present the results of calculation of transverse mode coupling instability (TMCI) thresholds for Very Large Hadron Collider (VLHC). The estimates are done with use of conventional approach and more sophisticated mode dynamics analysis. We found the RF system parameters which allows to get appropriate TMCI threshold number of particles per bunch and attain high luminosity of the collider. Alternative ways to raise the threshold are briefly discussed.
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摘要 :
We present the results of calculation of transverse mode coupling instability (TMCI) thresholds for Very Large Hadron Collider (VLHC). The estimates are done with use of conventional approach and more sophisticated mode dynamics a...
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We present the results of calculation of transverse mode coupling instability (TMCI) thresholds for Very Large Hadron Collider (VLHC). The estimates are done with use of conventional approach and more sophisticated mode dynamics analysis. We found the RF system parameters which allows to get appropriate TMCI threshold number of particles per bunch and attain high luminosity of the collider. Alternative ways to raise the threshold are briefly discussed.
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摘要 :
The Maxwell equations are transformed into generalized telegraphist equations, a set of linear differential equations equal to the set of equations describing the currents and voltages in mutually coupled transmission lines or in ...
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The Maxwell equations are transformed into generalized telegraphist equations, a set of linear differential equations equal to the set of equations describing the currents and voltages in mutually coupled transmission lines or in mutually coupled tuned LC-circuits. Each mode can then be identified with the current in one of the circuits. Power can be transferred from one circuit to another with different resonant frequency by reversing the sign of the coupling. In the microwave analogon this corresponds to a change of curvature along the axis of the guide which leads to a wiggling axis. In order to keep reflections low, the curvature should not change abruptly. This also simplifies the calculations. For practical reasons both ends of the converter should have the same direction and all wiggles should have the same form.
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摘要 :
Directional couplers for transverse electric (TE) modes which selectively pick one mode from a mode mixture in an overmoded circular waveguide system are described. Unwanted modes are statistically nulled out in the coupling waveg...
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Directional couplers for transverse electric (TE) modes which selectively pick one mode from a mode mixture in an overmoded circular waveguide system are described. Unwanted modes are statistically nulled out in the coupling waveguide. Mode selectivity and directivity oscillate up and down with an increasing number of holes and finally reach 20 dB. A directional coupler for the TE02 mode (28 GHz, 63.4 mm circular waveguide) with 41 holes and a length of 1.6 m shows a directivity of 68 dB and suppresses TE01 with 58 dB, TE03 with 28 dB, TE04 with 34 dB, TE22 with 37 dB, and further modes TElm (l5, m6) with 17 to 34 dB.
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摘要 :
Multihole couplers showing insufficient suppression of single modes or insufficient directivity can be improved by adding holes of a shifted coupler structure of the same kind. A shifted structure improving the directivity also en...
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Multihole couplers showing insufficient suppression of single modes or insufficient directivity can be improved by adding holes of a shifted coupler structure of the same kind. A shifted structure improving the directivity also enhances suppression of unwanted modes propagating in backward direction. On the other hand marked suppression of a single unwanted backward mode also improves suppression of the other backward modes as well as directivity.
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