Patent US3699480A successfully refreshed from Google Patents.
US3699480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable rf group delay equalizer
Assignee: MA Com Inc
•
Filing: 1969-12-15
•
Granted: 1972-10-17
•
Expires: 1989-12-15
Abstract
Abstract A tunable microwave phase equalizer primarily for use in satellite communication systems is disclosed comprising in combination a circulator and a two-knob tunable microwave cavity wherein one knob adjusts the resonant frequency, and the other knob adjusts the coupling. By means of the frequency adjustment a delay curve of practically constant shape and width can be moved into any 5, 10, 20 or 40 MHz band of the 6 GHz satellite range. By means of the coupling adjustment, the bandwidth is varied and with it the time delay curvature at the frequency of delay maximum to cancel third order intermodulations generally generated by the integral of the parabolic time delay curve. Second order intermodulation is eliminated by the frequency adjustment which changes the slope of the time delay curve and moves the curve away from the center frequency.
Inventors
- 👤 Martin Mueller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:06
CPC Classifications
H; H04; H04B; H04B14/00; H04B14/002; H04B14/006; H01; H01P; H01P9/00; H01P9/003; H03; H03H; H03H7/00; H03H7/52
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
153 words
A tunable microwave phase equalizer comprising an electromagnetic cavity resonator having an electrically conductive envelope enclosing a volume of space, means for varying said volume of space, common port means for introducing and removing electromagnetic wave energy into and from said variable volume of space within said cavity resonator, a first variable capacitor comprised of an electrically conductive rod passing through said envelope and movably electrically connected to said envelope for electrically coupling with said electromagnetic wave energy within said variable volume of space, a second variable capacitor comprised of an electrically conductive rod passing through said envelopE via said common port for electrically coupling with said electromagnetic wave energy within said variable volume of space, and coupling means comprised of a dielectric material affixed to and between said rods for coupling said first and second variable capacitors for simultaneous equal but opposite variation of capacitance of said first and second variable capacitors.
Claim 2
Dependent Claim
153 words
A tunable microwave phase equalizer comprising an electromagnetic cavity resonator having an electrically conductive envelope enclosing a volume of space, means for varying said volume of space, common port means for introducing and removing electromagnetic wave energy into and from said variable volume of space within said cavity resonator, a first variable capacitor comprised of an electrically conductive rod passing through said envelope and movably electrically connected to said envelope for electrically coupling with said electromagnetic wave energy within said variable volume of space, a second variable capacitor comprised of an electrically conductive rod passing through said envelopE via said common port for electrically coupling with said electromagnetic wave energy within said variable volume of space, and coupling means comprised of a dielectric material affixed to and between said rods for coupling said first and second variable capacitors for simultaneous equal but opposite variation of capacitance of said first and second variable capacitors.
Claim 3
Dependent Claim
67 words
A tunable microwave phase equalizer as recited in claim 1 including a three-port circulator wherein electromagnetic wave energy is supplied to the first port of said circulator and extracted from the third port of said circulator, and wherein the second port of said circulator is electrically connected to said common port means for introducing and removing electromagnetic wave energy into and from said variable volume of space.
Claim 4
Dependent Claim
216 words
A tunable microwave phase equalizer comprising an electromagnetic cavity resonator having an electrically conductive envelope enclosing a volume of space, common input-output transmission line means having a conductor electrically insulated from said envelope coupled through said envelope, a piston extending coaxially into said cavity resonator through an opening in said envelope defining a longitudinally movable end wall for adjustably varying said volume of said cavity resonator, an elongated plunger comprised of first and second electrically conductive rods and a dielectric material thereinbetween extending transversely through said cavity resonator, said first conductive rod being electrically connected to said insulated conductor of the input-output transmission line means, said second conductive rod being electrically connected to the cavity wall, both said conductive rods being movably supported in said envelope for adjustable extension beyond said envelope, first means positionally fixing said plunger transversely within said cavity whereby an adjustment of said plunger into said cavity causes first conductive rod to protrude into said cavity and second conductive rod to exit from said cavity by an equal amount while a removal of said plunger from said cavity causes first conductive rod to exit from said cavity, and second conductive rod to protrude into said cavity by an equal amount, and second means positionally fixing said said piston longitudinally within said cavity.
Claim 5
Dependent Claim
216 words
A tunable microwave phase equalizer comprising an electromagnetic cavity resonator having an electrically conductive envelope enclosing a volume of space, common input-output transmission line means having a conductor electrically insulated from said envelope coupled through said envelope, a piston extending coaxially into said cavity resonator through an opening in said envelope defining a longitudinally movable end wall for adjustably varying said volume of said cavity resonator, an elongated plunger comprised of first and second electrically conductive rods and a dielectric material thereinbetween extending transversely through said cavity resonator, said first conductive rod being electrically connected to said insulated conductor of the input-output transmission line means, said second conductive rod being electrically connected to the cavity wall, both said conductive rods being movably supported in said envelope for adjustable extension beyond said envelope, first means positionally fixing said plunger transversely within said cavity whereby an adjustment of said plunger into said cavity causes first conductive rod to protrude into said cavity and second conductive rod to exit from said cavity by an equal amount while a removal of said plunger from said cavity causes first conductive rod to exit from said cavity, and second conductive rod to protrude into said cavity by an equal amount, and second means positionally fixing said said piston longitudinally within said cavity.
Claim 6
Dependent Claim
66 words
A tunable microwave phase equalizer as recited in claim 3 including in combination a three-port circulator wherein electromagnetic energy is supplied to the first port of said circulator and extracted from the third port of said circulator, and wherein the second port of said circulator is electrically connected to said input-output transmission line means for introducing and removing electromagnetic energy into said variable volume of space.
Claim 7
Dependent Claim
37 words
A tunable microwave phase equalizer as recited in claim 4 including at least one turns-counting knob having a digital indicator on its top surface for indicating the resonant frequency to which said electromagnetic cavity resonator is tuned.
Claim 8
Dependent Claim
27 words
A tunable microwave phase equalizer as recited in claim 3 wherein 3.4 times the radius of said cavity is greater than the wavelength of the resonant frequency.
Claim 9
Dependent Claim
194 words
A tunable microwave phase equalizer comprising an electromagnetic cavity resonator having an electrically conductive envelope enclosing a volume of space, common input-output transmission line means having a conductor electrically insulated from said envelope coupled through said envelope, means for adjustable varying said volume of said cavity resonator, an elongated plunger comprised of first and second electrically conductive rods and a dielectric material thereinbetween extending transversely through said cavity resonator, said first conductive rod being electrically connected to said insulated conductor of the input-output transmission line means, said second conductive rod being electrically connected to the cavity wall, both said conductive rods being movably supported in said envelope for adjustable extension beyond said envelOpe, first means positionally fixing said plunger transversely within said cavity whereby an adjustment of said plunger into said cavity causes first conductive rod to protrude into said cavity and second conductive rod to exit from said cavity by an equal amount while a removal of said plunger from said cavity causes first conductive rod to exit from said cavity, and second conductive rod to protrude into said cavity by an equal amount, and second means for adjusting said volume varying means.
Claim 10
Dependent Claim
194 words
A tunable microwave phase equalizer comprising an electromagnetic cavity resonator having an electrically conductive envelope enclosing a volume of space, common input-output transmission line means having a conductor electrically insulated from said envelope coupled through said envelope, means for adjustable varying said volume of said cavity resonator, an elongated plunger comprised of first and second electrically conductive rods and a dielectric material thereinbetween extending transversely through said cavity resonator, said first conductive rod being electrically connected to said insulated conductor of the input-output transmission line means, said second conductive rod being electrically connected to the cavity wall, both said conductive rods being movably supported in said envelope for adjustable extension beyond said envelOpe, first means positionally fixing said plunger transversely within said cavity whereby an adjustment of said plunger into said cavity causes first conductive rod to protrude into said cavity and second conductive rod to exit from said cavity by an equal amount while a removal of said plunger from said cavity causes first conductive rod to exit from said cavity, and second conductive rod to protrude into said cavity by an equal amount, and second means for adjusting said volume varying means.
References Cited (Backward Citations)
US2630492A
Cited
US3087128A
Cited
US3289113A
Cited
US3311839A
Cited
US3466573A
Cited
US3516030A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |