Whispering gallery traveling wave interferometer for low phase noise applications

Tsarapkin, D.P.; Shtin, N.A.

doi:10.1109/freq.2004.1418562

Cited by 6 publications

(5 citation statements)

References 4 publications

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“…6 shows measured TW WGR DF transmission coefficient frequency responses for a different WGR coupling (β 1 = β 2 ≈ 0.5 -curve 1 and β 1 = β 2 ≈ 0.85 -curve 2). The measured TW WGR DF transmission coefficient responses are proved to be in a very good agreement with the conventional WGR reflection coefficient expression defined by (6). Furthermore, in the proposed DF structure a coupling could be set to any arbitrary value without effecting on a TW regimen.…”

Section: Sapphire Tw Wgr Directional Filterssupporting

confidence: 56%

“…However, it is easy to note a small azimuthal field variation that evidences the excited wave to have a small standing wave component. In [6] it was proposed to characterize a wave propagating in WGR by a standing wave ratio (SWR). Its value SWR = 1.12 can be easily derived finding relation between maximum and minimum of the E z magnitude.…”

Section: Novel Sapphire Directional Filters For Application To Ultra mentioning

confidence: 99%

“…A structure presented at Fig. 3a is supposed to be an equivalent to the resonator with single distributed coupling which is also referred as a 2-port directional filter (DF) [6].…”

Section: Sapphire Tw Wgr Directional Filtersmentioning

confidence: 99%

“…In [6] it was revealed that a main drawback of the TW WGR is related to the high sensitivity of its regimen to the parameters of the distributed coupling. Furthermore, it was found that a wave excited by the means of the distributed coupling has both a traveling wave and a standing wave component.…”

Section: Introductionmentioning

confidence: 99%

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Novel Sapphire Directional Filters for Application to Ultra Low Phase Noise Oscillators

Shtin

Romero²,

Prokhorov

2006

2006 3rd International Conference on Electrical and Electronics Engineering

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Traveling wave (TW) sapphire whispering gallery resonator (WGR) is considered to be a very attractive device for low phase noise microwave frequency sources. However, it was found that TW WGR with distributed coupling is very sensible to the parameters of the coupling and excitation of the pure TW in high-Q WGR is a big challenge. This paper deals with a novel sapphire TW WGR based on orthogonal lumped couplings and 3-db quadrature directional couplers. A general theoretical background of the proposed TW WGR as well as its 3D finite element analysis and experimental results are presented. Finally a novel ultra low phase noise oscillator configuration based on the TW WGR directional filter is proposed.

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Section: Sapphire Tw Wgr Directional Filterssupporting

confidence: 56%

Section: Novel Sapphire Directional Filters For Application To Ultra mentioning

confidence: 99%

“…A structure presented at Fig. 3a is supposed to be an equivalent to the resonator with single distributed coupling which is also referred as a 2-port directional filter (DF) [6].…”

Section: Sapphire Tw Wgr Directional Filtersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Novel Sapphire Directional Filters for Application to Ultra Low Phase Noise Oscillators

Shtin

Romero²,

Prokhorov

2006

2006 3rd International Conference on Electrical and Electronics Engineering

View full text Add to dashboard Cite

show abstract

“…These ideal conditions were not found to occur in our experimental investigation and in another reference. 5 In order to interpret these results, the model must include coupling in the antiparallel direction. This results in both directions of traveling waves coexisting in the resonator, with the same resonance frequency.…”

Section: Introductionmentioning

confidence: 98%