US4340870A
Expired / Lapsed
US
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Efficient higher order mode resonant combiner
Assignee: Motorola Solutions Inc
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Filing: 1980-07-28
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Granted: 1982-07-20
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Expires: 2000-07-28
Abstract
Abstract An efficient higher order mode resonant combiner in which a higher order mode accumulator cavity is adjusted to have the real part of its input characteristic impedance to be so minimized as to be less than the characteristic impedance Z o of the input circuit. When an active device is matched to this low, minimized value of cavity input impedance a mismatch results between the active device power source and the input to the combiner at undesired higher order modal frequencies. This resultant mismatch at undesired modal resonances obviates the need for mode suppression devices within the cavity which devices as taught in the prior art had detrimental effect of the efficiency of the combiner. The input impedance at the desired modal resonant frequency is minimized by choice of input and output coupling coefficients and by utilization of a secondary resonant cavity spaced a predetermined distance from the primary accumulator cavity so as to present a virtual short circuit across the input line above said primary accumulator cavity so as to virtually eliminate the effect of a terminating stabilizing load, Z o , in the input circuit.
Inventors
- 👤 Michael Dydyk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:38
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/213; H01P1/16; H03; H03B; H03B9/00; H03B9/12; H03B2009/126
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
113 words
In a higher order mode resonance combiner comprising a first higher order mode resonant cavity; an input circuit terminated in a stabilizing load of value Z o ; input coupling means for coupling energy from said input circuit to said first resonant cavity; and output coupling means for extracting energy from said first cavity, the improvement comprising: first means for reducing the real part, R in , of the input impedance, Z in , of said higher order mode resonance combiner; and second means for further reducing said R in to a value less than Z o such that at a selected modal resonant frequency, f o , R in shall be minimized.
Claim 2
Dependent Claim
113 words
In a higher order mode resonance combiner comprising a first higher order mode resonant cavity; an input circuit terminated in a stabilizing load of value Z o ; input coupling means for coupling energy from said input circuit to said first resonant cavity; and output coupling means for extracting energy from said first cavity, the improvement comprising: first means for reducing the real part, R in , of the input impedance, Z in , of said higher order mode resonance combiner; and second means for further reducing said R in to a value less than Z o such that at a selected modal resonant frequency, f o , R in shall be minimized.
Claim 3
Dependent Claim
77 words
The combiner of claim 1 wherein said first means for reducing the real part R in of said input impedance comprise means for selectively establishing the magnitudes of the input coupling coefficient β 1 of said input coupling means, and the output coupling coefficient β 2 of said output coupling means, the relationship of said β 1 to said β 2 being selected to reduce said R in at said selected modal resonant frequency f o .
Claim 4
Dependent Claim
73 words
The combiner of claim 1 or 2 wherein said second means for further reducing said R in to a value less than Z o comprise a second higher order mode resonant cavity so spaced from said first resonant cavity as to present a virtual short circuit in the vacinity of said input coupling means and so as to inhibit the passage of energy beyond said input coupling means of said first resonant cavity.
Claim 5
Dependent Claim
23 words
The combiner of claim 3 wherein said input circuit comprises a coaxial circuit coupled to an energy source and to said stabilizing termination.
Claim 6
Dependent Claim
33 words
The combiner of claim 4 wherein said coaxial circuit further comprises equalizing network means for making the input impedance of said input circuit directly proportional to the output impedance of said energy source.
Claim 7
Dependent Claim
14 words
The combiner of claim 5 wherein said energy source comprises a negative resistance device.
Claim 8
Dependent Claim
17 words
The combiner of claim 6 wherein said negative resistance device is an IMPATT diode or Gunn diode.
Claim 9
Dependent Claim
30 words
The combiner of claim 1 wherein said output coupling means further comprises means for coupling selectively to one of several higher order mode field configurations within said first resonant cavity.
Claim 10
Dependent Claim
25 words
The combiner of claim 5 wherein said coaxial circuit further comprises second input coupling means for coupling said coaxial circuit to said second resonant cavity.
Claim 11
Dependent Claim
39 words
The combiner of claim 9 wherein said coaxial circuit further comprises second impedance transformation means to reduce discontinuity effects of coupling said coaxial circuit to said first and said second resonant cavities and reduce losses in said stabilizing termination.
Claim 12
Dependent Claim
54 words
The combiner of claim 10 wherein said second input coupling means further comprise means for selectively establishing the magnitude of the input coupling coefficient β 1s of said second input coupling means, the relationship of said β 1s to said β 1 being selected to achieve a high output coupling coefficient β 2 .
Claim 13
Dependent Claim
55 words
The combiner of claim 11 wherein said means for selectively establising the magnitude of β 1s comprises means for establishing the height of said second resonant cavity, the relationship of the height of said second resonant cavity with respect to the height of said first resonant cavity determining the relationship between β 1s and β1.
Claim 14
Dependent Claim
27 words
The combiner circuit of claim 3 further comprising first tuning means for tuning said first resonant cavity without detriment to the selected higher order mode of resonance.
Claim 15
Dependent Claim
31 words
The combiner of claim 13 wherein said selected higher order mode of resonance is the TM 020 mode and said first tuning means is a depth adjustable, coaxially located tuning probe.
Claim 16
Dependent Claim
26 words
The combiner of claim 14 further comprising second tuning means for tuning said second resonant cavity without detriment to the selected higher order mode of resonance.
Claim 17
Dependent Claim
31 words
The combiner of claim 15 wherein said selected higher order mode of resonance is the TM 020 mode and said second tuning means is a depth adjustable, coaxially located tuning probe.
Claim 18
Dependent Claim
38 words
The combiner of claim 16 further comprising means for individually adjusting the depth of each of said first and second tuning probes, said means for adjusting said first tuning probe being coupled thereto through said second tuning probe.
Claim 19
Dependent Claim
27 words
The combiner of claim 2 wherein said means for selectively establishing the magnitude of said output coupling coefficient β 2 comprises a depth adjustable output coupling probe.
Claim 20
Dependent Claim
76 words
The combiner of claim 18 wherein said output coupling probe is a tapered probe coupled to the conductor of an output transmission line, said taper introducing a variation of impedance from a low value at the end of the probe to a high value at the conductor of the output transmission line such that the magnitude of β 2 is a function of the square of the ratio of the high to the low impedance values.
Claim 21
Dependent Claim
88 words
The combiner of claim 2 wherein said means for selectively establishing the magnitude of said output coupling coefficient β 2 comprises a tapered output coupling probe coupled to the conductor of an output transmission line, said taper introducing a variation of impedance from a low value at the end of the probe to a high value at the conductor of the output transmission line such that the magnitude of β 2 is a function of the square of the ratio of the high to the low impedance values.
Claim 22
Dependent Claim
28 words
The combiner of claim 12 wherein said input coupling means comprises a plurality of said coaxial circuits each coupled to an energy source and to a stabilizing termination.
Claim 23
Dependent Claim
42 words
The combiner of claim 21 further comprising means for selecting said higher order mode of resonant operation of said first and second resonant cavities to provide a resonant cavity of sufficient surface area for coupling to said plurality of said coaxial circuits.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-07-19 | 1986-01-18 | 1986-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-19 | 1990-01-18 | 1990-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-19 | 1994-01-18 | 1994-07-20 | $7700.00 | Window Closed / Lapsed |