US5424645A
Expired / Lapsed
US
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Doubly broadband triple resonance or quad resonance NMR probe circuit
Assignee: Doty Scientific Inc
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Filing: 1993-11-18
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Granted: 1995-06-13
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Expires: 2013-11-18
Abstract
Abstract A single NMR sample coil of inductance L S , in series with a mid-frequency (MF) tuning inductor grounded at one end, is doubly broadbanded using a first high-voltage broadband capacitor matching network in series with the two coils for the LF tuning and a second high-voltage broadband capacitor matching network connected to the junction between the two coils for the MF tuning. Isolation between the MF and LF ports is achieved by proper choice of a plug-in isolation capacitor between the two broadband matching networks. An inductively coupled floating HF tank circuit is inserted in series with one of the leads from the sample coil to produce the triple resonance circuit. The tuning elements for this HF tank are mounted on top of the adjacent broadband matching network. A second floating HF tank circuit may be inserted in series with the other lead from the sample coil to produce a balanced-HF triple resonance circuit or an unbalanced quad-resonance circuit. The tuning elements for the second HF tank circuit are mounted on top of the other broadband matching network. The inductors used in the HF tank or tanks each have inductance less than L S . The MF tuning inductor has inductance greater than L S /4 but less than 2L S .
Inventors
- 👤 F. David Doty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:20
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/32; G01R33/36; G01R33/3642; G01R33/365; G01R33/3628; G01R33/3635
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
184 words
A multi-tuned, broadband circuit for high-field solids NMR probes requiring a high-frequency port carrying a high frequency, a low-frequency port carrying a low frequency, and a mid-frequency port carrying a middle frequency, said multi-tuned circuit comprising: a sample excitation coil with a first lead at a first end and a second lead at a second end; a floating coil with a first lead and a second lead, said first lead of the floating coil connected to said second lead of said excitation coil; a high-frequency capacitive tuning network connected to said floating coil; a mid-frequency tuning inductor with a first lead and a grounded second lead, said first lead of the tuning inductor connected to said second lead of said floating coil; a mid-frequency capacitive tuning network connected to said first lead of said mid-frequency tuning inductor and connected with the mid-frequency port; an inductive coupling loop linking a portion of the flux of said floating coil and connected with the high frequency port; a low-frequency capacitive tuning network connected to said first lead of said excitation coil and connected with the low-frequency port.
Claim 2
Dependent Claim
184 words
A multi-tuned, broadband circuit for high-field solids NMR probes requiring a high-frequency port carrying a high frequency, a low-frequency port carrying a low frequency, and a mid-frequency port carrying a middle frequency, said multi-tuned circuit comprising: a sample excitation coil with a first lead at a first end and a second lead at a second end; a floating coil with a first lead and a second lead, said first lead of the floating coil connected to said second lead of said excitation coil; a high-frequency capacitive tuning network connected to said floating coil; a mid-frequency tuning inductor with a first lead and a grounded second lead, said first lead of the tuning inductor connected to said second lead of said floating coil; a mid-frequency capacitive tuning network connected to said first lead of said mid-frequency tuning inductor and connected with the mid-frequency port; an inductive coupling loop linking a portion of the flux of said floating coil and connected with the high frequency port; a low-frequency capacitive tuning network connected to said first lead of said excitation coil and connected with the low-frequency port.
Claim 3
Dependent Claim
19 words
The multi-tuned circuit of claim 1 wherein said floating coil is a multi-turn coil of fewer than six turns.
Claim 4
Dependent Claim
19 words
The multi-tuned circuit of claim 1 wherein said low-frequency capacitive tuning network comprises at least one high-pressure-gas-filled variable capacitor.
Claim 5
Dependent Claim
24 words
The multi-tuned circuit of claim 1 wherein said floating coil is further characterized in having length-to-diameter ratio greater than 0.2 and less than 2.0.
Claim 6
Dependent Claim
24 words
The multi-tuned circuit of claim 1 wherein the ratio of inductance of said excitation coil to that of said floating coil is approximately three.
Claim 7
Dependent Claim
30 words
The multi-tuned circuit of claim 1 above wherein said mid-frequency tuning inductor is further characterized by being a coaxial line of length approximately one fourth of the high frequency wavelength.
Claim 8
Dependent Claim
182 words
A multi-tuned, broadband circuit for high-field solids NMR probes requiring a high-frequency port carrying a high frequency, a low-frequency port carrying a low frequency, and a mid-frequency port carrying a mid-frequency, said multi-tuned circuit comprising: a sample excitation coil with a first lead at a first end and a second lead at a second end; a floating coil with a first lead and a second lead, said first lead of the floating coil connected to said first lead of said excitation coil; a high-frequency capacitive tuning network connected to said floating coil; a mid-frequency tuning inductor with a first lead and a grounded second lead, said first lead of the tuning inductor connected to said second lead of said excitation coil; a mid-frequency capacitive tuning network connected to said first lead of said mid-frequency tuning inductor and connected with the mid-frequency port; an inductive coupling loop linking a portion of the flux of said floating coil and connected with the high-frequency port; a low-frequency capacitive tuning network connected to said second lead of said floating coil and connected with the low-frequency port.
Claim 9
Dependent Claim
182 words
A multi-tuned, broadband circuit for high-field solids NMR probes requiring a high-frequency port carrying a high frequency, a low-frequency port carrying a low frequency, and a mid-frequency port carrying a mid-frequency, said multi-tuned circuit comprising: a sample excitation coil with a first lead at a first end and a second lead at a second end; a floating coil with a first lead and a second lead, said first lead of the floating coil connected to said first lead of said excitation coil; a high-frequency capacitive tuning network connected to said floating coil; a mid-frequency tuning inductor with a first lead and a grounded second lead, said first lead of the tuning inductor connected to said second lead of said excitation coil; a mid-frequency capacitive tuning network connected to said first lead of said mid-frequency tuning inductor and connected with the mid-frequency port; an inductive coupling loop linking a portion of the flux of said floating coil and connected with the high-frequency port; a low-frequency capacitive tuning network connected to said second lead of said floating coil and connected with the low-frequency port.
Claim 10
Dependent Claim
19 words
The multi-tuned circuit of claim 7 wherein said floating coil is a multi-turn coil of fewer than six turns.
Claim 11
Dependent Claim
19 words
The multi-tuned circuit of claim 7 wherein said low-frequency capacitive tuning network comprises at least one high-pressure-gas-filled variable capacitor.
Claim 12
Dependent Claim
24 words
The multi-tuned circuit of claim 7 wherein said floating coil is further characterized in having length-to-diameter ratio greater than 0.2 and less than 2.0.
Claim 13
Dependent Claim
24 words
The multi-tuned circuit of claim 7 wherein the ratio of inductance of said excitation coil to that of said floating coil is approximately three.
Claim 14
Dependent Claim
30 words
The multi-tuned circuit of claim 7 above wherein said mid-frequency tuning inductor is further characterized by being a coaxial line of length approximately one fourth of the high frequency wavelength.
Claim 15
Dependent Claim
217 words
An NMR probe comprising a multi-tuned, broadband circuit having a high-frequency port carrying a high frequency, a low-frequency port carrying a low frequency, and a mid-frequency port carrying a middle frequency, said multi-tuned circuit comprising: a sample excitation coil with a first lead at a first end and a second lead at a second end; a floating coil with a first lead and a second lead, said first lead of the floating coil connected to said second lead of said excitation coil; a high-frequency capacitive tuning network connected to said floating coil; a mid-frequency tuning inductor with a first lead and a grounded second lead, said first lead of the tuning inductor connected to said second lead of said floating coil; a mid-frequency capacitive tuning network connected to said first lead of said mid-frequency tuning inductor and connected with the mid-frequency port; an inductive coupling loop linking a portion of the flux of said floating coil and connected with the high frequency port; a low-frequency capacitive tuning network connected to said first lead of said excitation coil and connected with the low-frequency port; the probe further comprising a sample holder, means holding the sample holder within the excitation coil, and means holding the circuit and sample holder near the center of field of an external magnetic field.
Claim 16
Dependent Claim
217 words
An NMR probe comprising a multi-tuned, broadband circuit having a high-frequency port carrying a high frequency, a low-frequency port carrying a low frequency, and a mid-frequency port carrying a middle frequency, said multi-tuned circuit comprising: a sample excitation coil with a first lead at a first end and a second lead at a second end; a floating coil with a first lead and a second lead, said first lead of the floating coil connected to said second lead of said excitation coil; a high-frequency capacitive tuning network connected to said floating coil; a mid-frequency tuning inductor with a first lead and a grounded second lead, said first lead of the tuning inductor connected to said second lead of said floating coil; a mid-frequency capacitive tuning network connected to said first lead of said mid-frequency tuning inductor and connected with the mid-frequency port; an inductive coupling loop linking a portion of the flux of said floating coil and connected with the high frequency port; a low-frequency capacitive tuning network connected to said first lead of said excitation coil and connected with the low-frequency port; the probe further comprising a sample holder, means holding the sample holder within the excitation coil, and means holding the circuit and sample holder near the center of field of an external magnetic field.
Claim 17
Dependent Claim
19 words
The NMR probe of claim 13 wherein said floating coil is a multi-turn coil of fewer than six turns.
Claim 18
Dependent Claim
19 words
The NMR probe of claim 13 wherein said low-frequency capacitive tuning network comprises at least one high-pressure-gas-filled variable capacitor.
Claim 19
Dependent Claim
24 words
The NMR probe of claim 13 wherein said floating coil is further characterized in having length-to-diameter ratio greater than 0.2 and less than 2.0.
Claim 20
Dependent Claim
24 words
The NMR probe of claim 13 wherein the ratio of inductance of said excitation coil to that of said floating coil is approximately three.
Claim 21
Dependent Claim
30 words
The NMR probe of claim 13 above wherein said mid-frequency tuning inductor is further characterized by being a coaxial line of length approximately one fourth of the high frequency wavelength.
Claim 22
Dependent Claim
27 words
The NMR probe of claim 13 further comprising spinning means spinning a sample within the sample holder at a predetermined angle relative to the external magnetic field.
Claim 23
Dependent Claim
215 words
An NMR probe comprising a multi-tuned, broadband circuit having a high-frequency port carrying a high frequency, a low-frequency port carrying a low frequency, and a mid-frequency port carrying a mid-frequency, said multi-tuned circuit comprising: a sample excitation coil with a first lead at a first end and a second lead at a second end; a floating coil with a first lead and a second lead, said first lead of the floating coil connected to said first lead of said excitation coil; a high-frequency capacitive tuning network connected to said floating coil; a mid-frequency tuning inductor with a first lead and a grounded second lead, said first lead of the tuning inductor connected to said second lead of said excitation coil; a mid-frequency capacitive tuning network connected to said first lead of said mid-frequency tuning inductor and connected with the mid-frequency port; an inductive coupling loop linking a portion of the flux of said floating coil and connected with the high-frequency port; a low-frequency capacitive tuning network connected to said second lead of said floating coil and connected with the low-frequency port; the probe further comprising a sample holder, means holding the sample holder within the excitation coil, and means holding the circuit and sample holder near the center of field of an external magnetic field.
Claim 24
Dependent Claim
215 words
An NMR probe comprising a multi-tuned, broadband circuit having a high-frequency port carrying a high frequency, a low-frequency port carrying a low frequency, and a mid-frequency port carrying a mid-frequency, said multi-tuned circuit comprising: a sample excitation coil with a first lead at a first end and a second lead at a second end; a floating coil with a first lead and a second lead, said first lead of the floating coil connected to said first lead of said excitation coil; a high-frequency capacitive tuning network connected to said floating coil; a mid-frequency tuning inductor with a first lead and a grounded second lead, said first lead of the tuning inductor connected to said second lead of said excitation coil; a mid-frequency capacitive tuning network connected to said first lead of said mid-frequency tuning inductor and connected with the mid-frequency port; an inductive coupling loop linking a portion of the flux of said floating coil and connected with the high-frequency port; a low-frequency capacitive tuning network connected to said second lead of said floating coil and connected with the low-frequency port; the probe further comprising a sample holder, means holding the sample holder within the excitation coil, and means holding the circuit and sample holder near the center of field of an external magnetic field.
Claim 25
Dependent Claim
19 words
The NMR probe of claim 20 wherein said floating coil is a multi-turn coil of fewer than six turns.
Claim 26
Dependent Claim
19 words
The NMR probe of claim 20 wherein said low-frequency capacitive tuning network comprises at least one high-pressure-gas-filled variable capacitor.
Claim 27
Dependent Claim
24 words
The NMR probe of claim 20 wherein said floating coil is further characterized in having length-to-diameter ratio greater than 0.2 and less than 2.0.
Claim 28
Dependent Claim
24 words
The NMR probe of claim 20 wherein the ratio of inductance of said excitation coil to that of said floating coil is approximately three.
Claim 29
Dependent Claim
30 words
The NMR probe of claim 20 above wherein said mid-frequency tuning inductor is further characterized by being a coaxial line of length approximately one fourth of the high frequency wavelength.
Claim 30
Dependent Claim
27 words
The NMR probe of claim 20 further comprising spinning means spinning a sample within the sample holder at a predetermined angle relative to the external magnetic field.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-06-12 | 1998-12-12 | 1999-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-06-12 | 2002-12-12 | 2003-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-06-12 | 2006-12-12 | 2007-06-13 | $7700.00 | Window Closed / Lapsed |