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1.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Belyaev B. A., Serzhantov A. M., Tyurnev V. V.
Заглавие
: A dual-mode split microstrip
resonator
and Its applications in frequency selective devices
Место публикации
: Microwave Opt. Technol. Lett. - 2013. - Vol. 55, Is. 9. - P.2186–2190. -
DOI
10.1002/mop.27806
Аннотация:
A dual-mode microstrip
resonator
whose strip conductor is partially split from its one end by a longitudinal slot has been studied. The
resonator
has two fundamental modes, even and odd ones. The difference of their frequencies is controlled by varying the slot length. Based on such resonators, original structures of a diplexer and passband filters including dual-band have been designed. Measured performances of their fabricated prototypes prove applicability of designed devices in microwave engineering.
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2.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Belyaev B. A., Serzhantov A. M., Leksikov An. A., Bal'va Ya. F., Aleksandrovsky A. S., Galeev R. G
Заглавие
: A high-selectivity waveguide bandpass filter with interference suppression by more than 120 dB in rejection band
Колич.характеристики
:5 с
Место публикации
: Tech. Phys. Lett. - 2023. - Vol. 49, Is. 5. - P.72-76. - ISSN 10637850 (ISSN),
DOI
10.21883/TPL.2023.05.56034.19541. - ISSN 10906533 (eISSN)
Примечания
: Cited References: 10. - This study was carried out under agreement No. 470 dated August 30, 2022, between the Kirensky Institute of Physics (Siberian Branch, Russian Academy of Sciences), the Regional Science Foundation, and ”AO ”NPP ”Radiosvyaz“ as part of a competitive tender of research-andengineering and innovative projects for the first climatological research and education center ”Yenisey Siberia“
Аннотация:
The design of a 10th-order waveguide bandpass filter with an additional inductive cross-coupling between non-adjacent resonators has been proposed and studied. An inductive coupling is formed by a U-shaped conductor structure with grounded ends that is formed in the filter cover. This method of cross-coupling organization ensures not only the temperature stability of the characteristics, but also the manufacturability of the structure. The high selectivity of the device is achieved by both the attenuation poles located near the passband, as well as the level of suppression in the stopbands, exceeding 120 dB. The passband loss of the fabricated filter is ~ 0.8 dB at its central frequency f0=18.2 GHz and relative bandwidth Δf/f0=1.5%. The small dimensions (135 x 30 x 10 mm) and the weight of about 200 g of the device, with simultaneously high electrical characteristics show the promise of its use, for example, in on-board and ground-based space communication systems.
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3.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Belyaev B. A., Khodenkov S. A., Govorun I. V., Serzhantov A. M.
Заглавие
: A high-selectivity wideband bandpass dual-mode microstrip filter
Место публикации
: Dokl. Phys. - 2022. - Vol. 67, Is. 3. - P.89-93. - ISSN 10283358 (ISSN),
DOI
10.1134/S1028335822020021. - ISSN 15626903 (eISSN)
Примечания
: Cited References: 12. - This study was carried out within a State Assignment, project no. FEFE-2020-0013, of the Ministry of Science and Higher Education of the Russian Federation
Аннотация:
A half-wave microstrip
resonator
design with an irregular strip conductor short-circuited to the screen by its ends has been investigated. Based on the resonances of the first two oscillatory modes of this
resonator
, a miniaturized second-order filter with a fractional bandwidth from 40% to 90% has been implemented, which has a wide high-frequency stopband. A prototype of the designed eight-order filter based on four dual-mode resonators with a passband center frequency of 2 GHz and a fractional bandwidth of 40% has been fabricated on an alumina substrate 45.0 × 10.5 × 1.0 mm3 in size with a permittivity of ε = 9.8. The filter frequency response slopes are extremely steepness due to two attenuation poles located on the left and right sides of the passband. The experimental characteristics of the prototype are in good agreement with the data of the numerical electromagnetic simulation of the 3D model of the filter.
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4.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Belyaev B. A., Serzhantov A. M., Leksikov An. A., Bal'va Y. F., Grushevskii E. O., Khodenkov S. A.
Заглавие
: A highly selective stripline lowpass filter with more than 100-dB wide stopband attenuation
Коллективы
: Ministry of Education and Science of the Russian FederationMinistry of Education and Science, Russian Federation [02G25.31.0330]
Место публикации
: Tech. Phys. Lett. - 2020. - Vol. 46, Is. 4. - P.364-367. - ISSN 1063-7850,
DOI
10.1134/S1063785020040173. - ISSN 1090-6533(eISSN)
Примечания
: Cited References: 8. - This study was supported in part by the Ministry of Education and Science of the Russian Federation in the framework of agreement no. 02G25.31.0330.
Аннотация:
A new miniature design of a highly selective lowpass filter based on a suspended substrate with a two-sided stripline pattern has been developed. The filter frequency response slope (cutoff attenuation rate) and stopband attenuation depth are determined by transmission zeros, the number of which is equal to the filter order. An experimental prototype of a fifth-order lowpass filter on 0.5-mm-thick alumina substrate with dielectric permittivity ε = 9.8 has been synthesized with the aid of numerical electrodynamic analysis of a three-dimensional model. The cutoff frequency of the filter passband at a –1-dB level is fc = 1.75 GHz. The stopband width at a –100-dB attenuation level reaches 4.4fc.
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5.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Babitskii A. N., Belyaev B. A., Boev N. M., Skomorokhov G. V., Izotov A. V., Galeev R. G.
Заглавие
: A magnetometer of weak quasi-stationary and high-frequency fields on
resonator
microstrip transducers with thin magnetic fields
Место публикации
: Instrum. Exp. Tech.: MAIK Nauka-Interperiodica / Springer, 2016. - Vol. 59, Is. 3. - P.425-432. - ISSN 00204412 (ISSN),
DOI
10.1134/S0020441216030131
Примечания
: Cited References: 23. - This study was performed within the framework of the State Job of the Ministry of Education and Science of the Russian Federation for the research at the Siberian Federal University in 2014 (project no. 3.528.2014K).
Предметные рубрики:
Ferromagnetic-resonance
Films
Susceptibility
Anisotropy
Sensors
Trends
Аннотация:
A high-sensitivity magnetometer for simultaneous measurements of three components of a weak quasi-stationary or high-frequency magnetic-field vector was developed and investigated. Microstrip structures that are based on irregular resonators serve as the magnetometer transducers. An anisotropic thin-film magnetic structure is used as the sensing element. This structure consists of two thin magnetic films that are prepared by magnetron sputtering of a Ni75Fe25 permalloy target and separated by a silicon monoxide layer. It is demonstrated that the transducer exhibits the maximum sensitivity, when the easy magnetization axis of the film structure is orthogonal to the polarization direction of the pumping microwave magnetic field in the microstrip
resonator
and at an optimal value of a constant magnetic bias field and its optimal deflection from the pumping-field polarization direction which is parallel to it. The magnetometer is characterized by a wide dynamic range of measured magnetic fields, 10–10–10–4 Т, and a wide frequency range, 10–1–105 Hz. © 2016, Pleiades Publishing, Inc.
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6.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Belyaev B. A., Serzhantov A. M., Leksikov An. A., Bal'va Y. F., Galeev R. G.
Заглавие
: A monolithic miniature multi-conductor strip-
resonator
bandpass filter
Место публикации
: Tech. Phys. Lett. - 2021. - Vol. 47, Is. 9. - P.645-648. - ISSN 10637850 (ISSN),
DOI
10.1134/S106378502107004X
Примечания
: Cited References: 10. - This study was supported by the Ministry of Science and Higher Education of the Russian Federation, complex project “Creating High-Tech Production of Earth Stations of Advanced Satellite Communication Systems for Connectivity of Remote, Northern, and Arctic Territories of the Russian Federation” carried out with the participation of the Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, agreement no. 075-11-2019-078 dated December 13, 2019
Аннотация:
A new monolithic design of a miniature bandpass filter for manufacture by means of multilayer printed-circuit-board technology has been developed. It is demonstrated using a fourth-order filter that multi-conductor strip resonators used in the design ensure both miniaturization and high selectivity of the device. The passband center frequency of the manufactured filter is f0 = 546 MHz, the fractional bandwidth is Δf/f0 = 25%, and the insertion loss is 0.8 dB. The filter has a wide high-frequency stopband, which extends up to a frequency of 10f0 at a level of –30 dB. The filter dimensions are 15.0 × 12.0 × 4.3 mm (0.027λ0 × 0.021λ0 × 0.007λ0, where λ0 is the wavelength in vacuum at frequency f0) and the mass is only 1.8 g. The performances of the filter and the accessibility of its design for surface mounting show that the device has great potential.
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7.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Belyaev B. A., Khodenkov S. A., Leksikov An. A., Shabanov V. F.
Заглавие
: A three-mode microstrip
resonator
and a miniature ultra-wideband filter based on it
Место публикации
: Dokl. Phys.: Maik Nauka-Interperiodica Publishing, 2017. - Vol. 62, Is. 6. - P.289-293. - ISSN 10283358 (ISSN),
DOI
10.1134/S102833581706009X
Примечания
: Cited References: 14
Ключевые слова
(''Своб.индексиров.''): bandpass filters--microwave filters--resonators--filter structures--high selectivity--microstrip
resonator
--oscillation mode--parametric synthesis--passband frequencies--ultra-wideband filters--wide band filter--microstrip filters
Аннотация:
An original microstrip
resonator
design with a strip conductor split by a slot at one of its ends is investigated. It is demonstrated that at the optimal slot sizes, when the eigenfrequency of the second oscillation mode hits the center between the first and third oscillation modes, the
resonator
can work as a thirdorder bandpass filter. The structure formed from only two such resonators electromagnetically coupled by split conductor sections is a miniature six-order wideband filter with high selectivity. The test prototype of the filter with a central passband frequency of ~1.2 GHz and a passband width of ~0.75 GHz fabricated on a substrate ~(45 × 11 × 1) mm3 in size with a permittivity of 80 is characterized by minimum loss in a passband of 0.5 dB. The parametric synthesis of the filter structure was performed using electrodynamic analysis of the 3D model. The measured characteristics of the test prototype agree well with the calculated data.
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8.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Babitskii A. N., Belyaev B. A., Skomorokhov G. V., Izotov A. V., Galeev R. G.
Заглавие
: A weak-field magnetometer based on a
resonator
microstrip transducer with thin magnetic films
Коллективы
: Ministry of Education and Science of the Russian Federation, state order for Siberian Federal University [3.528.2014K]
Место публикации
: Tech. Phys. Lett.: MAIK Nauka-Interperiodica / Springer, 2015. - Vol. 41, Is. 4. - P.324-327. - ISSN 1063,
DOI
10.1134/S1063785015040021. - ISSN 10906533(eISSN)
Примечания
: Cited References:12. - This study was supported by the Ministry of Education and Science of the Russian Federation, state order for Siberian Federal University in 2014, task no. 3.528.2014K.
Аннотация:
A high-sensitivity magnetometer of weak quasi-stationary magnetic fields is developed and investigated. The magnetometer transducer is a microstrip
resonator
with an active medium from thin magnetic films prepared by magnetron sputtering of a Ni75Fe25 permalloy target. It is demonstrated that the transducer exhibits the maximum sensitivity not only in the optimal dc magnetic field, but also at the optimal deviation of this field from the rf pump field polarization direction. The magnetometer operates in a wide dynamic range of measured magnetic fields from 10−4 to 10−2 μT at frequencies of 10−1–105 Hz.
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9.
Вид документа
: Статья из сборника (выпуск продолж. издания)
Шифр издания
:
Автор(ы)
: Belyaev B. A., Serzhantov A., Balva Y. F., Galeev R., Lemberg K., Leksikov An. A.
Заглавие
: ALD stripline
resonator
and bandpass filters for VHF and UHF bands
Коллективы
: IEEE MTT-S International Microwave Filter Workshop 2021
Место публикации
: 2021 IEEE MTT-S International Microwave Filter Workshop, IMFW 2021: Institute of Electrical and Electronics Engineers, 2021. - 2021 IEEE MTT-S International Microwave Filter Workshop, IMFW 2021 (17 - 19 November 2021, Perugia, Italy) Conference code: 175723. - P.65-68. - ,
DOI
10.1109/IMFW49589.2021.9642365
Примечания
: Cited References: 15
Аннотация:
It is shown that for an optimal substrate thickness ALD technology will be promising for IF bandpass filter designing. A two-conductor stripline ALD
resonator
with central frequency 200 MHz will have Q-factor 53 with total length 3.7 mm (0.0025λg) and the frequency separation of the first and the second oscillation modes up to 59. Two bandpass filters for VHF and UHF designed and fabricated for commercial application display good agreement between the simulation and the experiment. A 3-pole bandpass filter with central frequency 255 MHz and lateral size 15.8×3.2 mm2 has stopband width 13.5f0 , and a 6-pole bandpass filter with central frequency 1250 MHz and lateral size 4.4×5.1 mm2 has stopband width 9.4f0.
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10.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Belyaev B. A., Serzhantov A. M., Leksikov An. A., Bal'va Y. F., Grushevskii E. O.
Заглавие
: An ultra-wideband stripline bandpass filter with a noise suppression level of more than 100 dB
Коллективы
: Ministry of Science and Higher Education of the Russian Federation [075-11-2019-078]
Место публикации
: Tech. Phys. Lett. - 2020. - Vol. 46, Is. 8. - P.787-791. - ISSN 1063-7850,
DOI
10.1134/S1063785020080179. - ISSN 1090-6533(eISSN)
Примечания
: Cited References: 9. - This work was financially supported by the Ministry of Science and Higher Education of the Russian Federation in the implementation of the integrated project "Creation of a production of earth stations of advanced satellite communications systems to ensure the coherence of hard, northern and Arctic territory of Russian Federation," implemented with the participation of the Federal Research Center "Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences|" (agreement number 075-11-2019-078 dated 13.12.2019)
Аннотация:
An ultra-wideband bandpass filter formed by cascading of a novel high-pass filter (HPF) and a low-pass filter (LPF) on suspended substrates with a two-sided pattern of strip conductor has been investigated. The high selectivity of the HPF is ensured by the transmission zeros near the passband, the number of which is equal to the filter order. A second-order HPF has been designed on a 0.5-mm-thick substrate with a permittivity of ε = 9.8 using the numerical electrodynamic analysis of a 3D model of the filter. The experimental HPF prototype has a cutoff frequency of fb = 0.25 GHz at a level of –3 dB and a passband that extends to 5 GHz. The ultra-wideband bandpass filter formed by cascading of the LPF and the designed HPF has a fractional bandwidth of Δf/f0 = 150% with a central frequency of f0 = 1 GHz. It has the broad and deep high-frequency stopband, which extends to a frequency of 7.8f0 at a suppression level of –100 dB.
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11.
Вид документа
: Статья из сборника (выпуск продолж. издания)
Шифр издания
:
Автор(ы)
: Belyaev B. A., Lemberg K. V., Serzhantov A. M.
Заглавие
: An X-band magnetically tunable bandpass filter based on novel waveguide cavity
resonator
Коллективы
: Asia-Pacific Microwave Conference
Место публикации
: Asia-Pacific Microwave Conference Proceedings, APMC 2016: Institute of Electrical and Electronics Engineers Inc., 2017. - ,
DOI
10.1109/APMC.2016.7931355
Примечания
: Cited References: 12
Ключевые слова
(''Своб.индексиров.''): bandpass filters--cavity resonators--waveguides--operating modes--relative bandwidth--tunable band-pass filters--tunable frequency--tunable wave-guides--two-pole filters--unloaded quality factors--waveguide cavity resonators--waveguide filters
Аннотация:
This paper presents a ferrite tunable waveguide filter showing high Qu and high tunability in X-band. A new type of waveguide cavity
resonator
with an H102 operating mode was proposed for the creation of a low-loss, two-pole filter. The filter results in an insertion loss of 3.6-4.1 dB over the tuning range 8.74-9.63 GHz with a relative bandwidth of 0.92-0.79% and biasing magnetic field 0-600 Oe. This design demonstrates an unloaded quality factor of 380-396 over the tunable frequency range. © 2016 IEEE.
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12.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Belyaev B. A., Tyurnev V. V.
Заглавие
: Analysis of the quality factor of the optical half-wavelength
resonator
Место публикации
: Microwave Opt. Techn. Lett. - 2013. - Vol. 55, Is. 7. - P.1613-1616. -
DOI
10.1002/mop.27662
Аннотация:
An electrodynamic analysis of an optical
resonator
comprising a half-wavelength dielectric layer that is covered from both sides by quarter-wavelength layers with higher and lower refractive indices (RIs) is carried out.For such a
resonator
, the dependences of the external quality factor on number and RIs of the layers are obtained first. That allows one to determine minimum number of the layers in the structure to achieve the required quality factor at practically any contrast of the RIs. The results of this study provide an easy way to optimize the structures of 1D photonic crystal devices, particularly high-selectivity bandpass filters.
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13.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Bulgakov E. N., Sadreev A. F.
Заглавие
: Bound States in Photonic Fabry-Perot
Resonator
Comprised of Two Nonlinear Off-Channel Defects
Коллективы
: Russian Foundation for Basic Research [09-02-98005-Siberia]
Место публикации
: JETP Letters. - 2009. - Vol. 90, Is. 12. - P.744-749. - ISSN 0021-3640,
DOI
10.1134/S0021364009240023
Примечания
: Cited References: 32. - We thank Kostya Pichugin for many helpful discussions. The work was partially supported by the Russian Foundation for Basic Research, project no. 09-02-98005-Siberia.
Предметные рубрики:
SCATTERING-THEORY
WAVE-GUIDE
CONTINUUM
MODES
Аннотация:
Two off-channel nonlinear defects coupled to the photonic waveguide constitute the Fabry-Perot interfer-ometer (FPR). The defects are made from a Kerr-like nonlinear material. For the linear case such a FPR can support the bound states in the form of standing waves between the defects if the distance between them is quantized. For the nonlinear case the bound states appear for arbitrary distance between the defects however for an quantized electromagnetic intensity. For the transmission through FPR we reveal new resonances and show these are a result of coupling of the bound states with incident wave because of nonlinearity of the defects. The resonances are spaced at the eigen frequencies of bound states.
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14.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Bulgakov E.N., Sadreev A.F.
Заглавие
: Bound States in Photonic Fabry-Perot
Resonator
with Nonlinear Off Channel Defects
Место публикации
: Phys. Rev. B. - 2010. - Vol. 81. - С. 115128-12
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15.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Bulgakov E. N., Sadreev A. F.
Заглавие
: Bound states in photonic Fabry-Perot
resonator
with nonlinear off-channel defects
Коллективы
:
Место публикации
: Phys. Rev. B: AMER PHYSICAL SOC, 2010. - Vol. 81, Is. 11. - Ст.115128. - ISSN 1098-0121,
DOI
10.1103/PhysRevB.81.115128
Примечания
: Cited References: 73. - The work was partially supported by RFBR under Grant No. 09-02-98005 "Siberia." We are greatly acknowledge Konstantin Pichugin for many discussions.
Предметные рубрики:
CRYSTAL WAVE-GUIDES
STATIONARY LOCALIZED STATES
COUPLED-MODE THEORY
OPTICAL RESONATORS
NUCLEAR REACTIONS
UNIFIED THEORY
MICROCAVITIES
TRANSMISSION
CONTINUUM
CIRCUITS
Аннотация:
We consider a Fabry-Perot
resonator
(FPR) comprised of two off-channel nonlinear defects coupled to the photonic waveguide. For the linear case FPR can support bound states in the form of standing waves between the defects if a distance between them is quantized. For the nonlinear case the bound states appear for arbitrary distance between the defects if electromagnetic intensity is quantized. For transmission through the FPR we reveal additional resonances which are the result of coupling of incident wave with the bound states because of nonlinearity of the defects. The resonances are spaced at the eigenfrequencies of bound states with a width proportional to the input amplitude. The theory of the FPR based on the simple Wang and Fan model [Phys. Rev. E 68, 066616 (2003)] is complemented by the tight-binding one. The results for the transmission and bound states in these models agree with computations in real two-dimensional photonic crystal waveguide coupled with two off-channel defects fabricated from a Kerr-type material.
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16.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Pilipchuk A. S., Pilipchuk A. A., Sadreev A. F.
Заглавие
: Bound states in the continuum in open spherical
resonator
Место публикации
: Phys. Scr. - 2020. - Vol. 95, Is. 8. - Ст.085002. - ISSN 00318949 (ISSN),
DOI
10.1088/1402-4896/ab99fb
Примечания
: Cited References: 33
Аннотация:
We consider the bound states in the continuum (BICs) or embedded trapped modes in an open spherical acoustic
resonator
. The eigenfrequencies of closed
resonator
are 2l+1-fold degenerated, where l is the orbital index. An attachment of two cylindrical waveguides lifts this degeneracy and transforms the eigenfrequencies into resonances whose real parts depend on the position of the waveguides. When the waveguides are angled by θ ≠ π, variation over that angle gives rise to avoided crossings of resonant modes with different l to result in the Friedrich-Wintgen BICs. For θ = π there might be only the symmetry protected BICs. When three waveguides are connected to the spherical
resonator
the Friedrich-Wintgen BICs occur due to the avoided crossings of resonant modes with the same l but different azimuthal indices -l ≤ m ≤ l.
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17.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Maksimov D. N., Sadreev A. F., Lyapina A. A., Pilipchuk A. S.
Заглавие
: Coupled mode theory for acoustic resonators
Коллективы
: Russian Science Foundation [14-12-00266]
Место публикации
: Wave Motion: Elsevier Science, 2015. - Vol. 56. - P.52-66. - ISSN 0165,
DOI
10.1016/j.wavemoti.2015.02.003. - ISSN 1878433X(eISSN)
Примечания
: Cited References:42. - We thank K.N. Pichugin for helpful discussions. The work was supported by grant 14-12-00266 from Russian Science Foundation.
Предметные рубрики:
WAVE-GUIDES
TRAPPED MODES
DISCONTINUITIES
TRANSMISSION
BILLIARDS
Ключевые слова
(''Своб.индексиров.''): coupled mode theory--non-hermitian hamiltonian--acoustic
resonator
--s-matrix
Аннотация:
We develop the effective non-Hermitian Hamiltonian approach for open systems with Neumann boundary conditions. The approach can be used for calculating the scattering matrix and the scattering function in open resonator–waveguide systems. In higher than one dimension the method represents acoustic coupled mode theory in which the scattering solution within an open
resonator
is found in the form of expansion over the eigenmodes of the closed
resonator
decoupled from the waveguides. The problem of finding the transmission spectra is reduced to solving a set of linear equations with a non-Hermitian matrix whose anti-Hermitian term accounts for coupling between the
resonator
eigenmodes and the scattering channels of the waveguides. Numerical applications to acoustic two-, and three-dimensional resonator–waveguide problems are considered.
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18.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Belyaev B. A., Boev N. M., Izotov A. V., Solovev P. N.
Заглавие
: Domain structure and magnetization reversal in multilayer structures consisting of thin permalloy films separated with nonmagnetic interlayers
Коллективы
: Ministry of Science and Higher EducationMinistry of Science and Higher Education, PolandEuropean Commission
Место публикации
: Russ. Phys. J. - 2021. - Vol. 64, Is. 6. - P.1160-1167. - ISSN 1064-8887,
DOI
10.1007/s11182-021-02436-w. - ISSN 1573-9228(eISSN)
Примечания
: Cited References: 30. - This work was financially supported by the Ministry of Science and Higher Education under agreement No. 075-11-2019-054 November 22, 2019
Предметные рубрики:
MICROMAGNETIC CALCULATION
MAGNETOMETER
SIMULATION
NOISE
Аннотация:
Using numerical micromagnetic modeling, we have investigated the development of domain structure and magnetization reversal in multilayer thin-film structures. The permalloy (Ni80Fe20) magnetic layers had the inplane uniaxial and perpendicular magnetic anisotropy. We found that as the thickness of nonmagnetic interlayers decreases, the in-plane configuration of magnetic moments in the permalloy layers transforms from a single domain state to stripe domains, which is caused by the increase of magnetostatic interaction between layers. In structures with "thick" interlayers, even weak magnetostatic interaction enforces the neighboring single domain permalloy layers to have opposite orientations of magnetic moments. The saturation field of such samples increases linearly with the number of layers. By analyzing the dynamic characteristics of multilayers, we determined the optimum number of layers ensuring the maximum conversion efficiency of wideband microwave microstrip sensors of weak magnetic fields.
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19.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Tyurnev V. V., Serzhantov A. M.
Заглавие
: Dual-mode split microstrip
resonator
for compact narrowband bandpass filters
Место публикации
: Prog. Electromagn. Res. C. - 2011. - Vol. 23. - С. 151-160. - ISSN 19378718 (ISSN),
DOI
10.2528/PIERC11062104
Ключевые слова
(''Своб.индексиров.''): 1-d models--average frequency--dual modes--dual-mode filter--microstrip
resonator
--narrow bands--oscillation mode--pass bands--structure parameter--transmission zeros--bandpass filters--frequency response--natural frequencies--resonators--microstrip filters
Аннотация:
A straight split dual-mode microstrip
resonator
is proposed. The frequencies of the two first oscillation modes in the
resonator
may be brought closer together by adjusting a split parameter whereas the frequency of the third mode remains approximately equal to the doubled average frequency of the first and the second modes. It is shown that formulas derived within 1D model give qualitatively true relations between the resonant frequencies and the structure parameters of the
resonator
. Examples of narrowband bandpass filters of the fourth and the sixth order are described. Transmission zeros below and above the passband substantially improve the filter's performance. The simulated frequency response of the three-
resonator
dual-mode filter is compared with the measured response of the fabricated filter.
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20.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Sadreev A. F.
Заглавие
: Enhancement of Rayleigh scattering in a two-dimensional Fabry-Perot
resonator
loaded with impurities
Коллективы
: Russian Science Foundation (RSF) [14-12-00266]
Место публикации
: J. Opt. Soc. Am. A: Optical Society of America, 2016. - Vol. 33, Is. 7. - P.1277-1282. - ISSN 1084-7529,
DOI
10.1364/JOSAA.33.001277. - ISSN 1520-8532(eISSN)
Примечания
: Cited References:32. - Russian Science Foundation (RSF) (14-12-00266)
Предметные рубрики:
COUPLED-MODE THEORY
MULTIPLE-SCATTERING
NUCLEAR REACTIONS
UNIFIED THEORY
RANDOM-MEDIA
TRANSMISSION
PARTICLES
WAVES
LIGHT
STRIP
Аннотация:
We study wave transmission through a Fabry-Perot
resonator
(FPR) loaded with point-like impurities. We show both analytically in the framework of the coupled mode theory and numerically that there are two different regimes for transmission dependent on the quality of the FPR mirrors. For low quality, we obtain transmittance very similar to the clean FPR with slightly shifted Lorentz peaks. However, for good quality, the transmittance peaks are strongly reduced and substituted with Gaussian peaks because of multiple scattering of waves by each impurity. As a side effect, we observe the angular (channel) conversion in the disordered FPR. We demonstrate that the resonant peaks are dependent on the concentration of impurities to pave a way for resonant measurement of the concentration. (C) 2016 Optical Society of America
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