US4427936A
Expired / Lapsed
US
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Reflection coefficient measurements
Assignee: Microwave Development Laboratories Inc
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Filing: 1981-06-22
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Granted: 1984-01-24
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Expires: 2001-06-22
Abstract
Abstract A compact apparatus for the accurate measurement of complex reflection coefficients and VSWR of a device over a bandwidth of an octave or greater by preferably measuring three power levels at detectors associated with the device. The device is formed by the junction of 5 transmission lines two of which are used for receiving a test signal and for transmitting the signal to the device being measured. The other three transmission lines are connected to detector arms each having a detector associated therewith. The techniques of the invention are embodied herein in a waveguide embodiment, a stripline embodiment and a microstrip embodiment of the invention.
Inventors
- 👤 Gordon P. Riblet
- 👤 Bertil E. R. Hansson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:22
CPC Classifications
G; G01; G01R; G01R27/00; G01R27/02; G01R27/04
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
131 words
A matched lossless reciprocal power divider used for the measurement of reflection coefficient and comprising; means defining a common central resonator junction having only five ports, a transmission line associated with each port, only five matching means associated respectively with the five transmission lines intercoupling each transmission line to a port of the resonator junction, first, second and third power level detectors, a first of said ports receiving a test signal, a second of said ports coupling to a device being measured, third, fourth and fifth of said ports coupling, respectively, to said first, second and third power level detectors, and a directional coupler associated with the transmission line coupling to the first port and including means coupled from the coupler for monitoring the incident power coupled to the resonator junction.
Claim 2
Dependent Claim
131 words
A matched lossless reciprocal power divider used for the measurement of reflection coefficient and comprising; means defining a common central resonator junction having only five ports, a transmission line associated with each port, only five matching means associated respectively with the five transmission lines intercoupling each transmission line to a port of the resonator junction, first, second and third power level detectors, a first of said ports receiving a test signal, a second of said ports coupling to a device being measured, third, fourth and fifth of said ports coupling, respectively, to said first, second and third power level detectors, and a directional coupler associated with the transmission line coupling to the first port and including means coupled from the coupler for monitoring the incident power coupled to the resonator junction.
Claim 3
Dependent Claim
19 words
A matched reciprocal power divider as set forth in claim 1 wherein each matching network comprises a matching transformer.
Claim 4
Dependent Claim
16 words
A matched reciprocal power divider as set forth in claim 1 having five fold rotational symmetry.
Claim 5
Dependent Claim
15 words
A matched reciprocal power divider as set forth in claim 1 made in stripline construction.
Claim 6
Dependent Claim
15 words
A matched reciprocal power divider as set forth in claim 1 made in waveguide construction.
Claim 7
Dependent Claim
15 words
A matched reciprocal power divider as set forth in claim 1 made in microstrip construction.
Claim 8
Dependent Claim
27 words
A matched reciprocal power divider as set forth in claim 1 wherein said means coupled from the coupler for monitoring the incident power comprises a reference detector.
Claim 9
Dependent Claim
26 words
A matched reciprocal power divider as set forth in claim 1 wherein all ports are disposed radially of the central resonator junction and are substantially planar.
Claim 10
Dependent Claim
33 words
A matched reciprocal power divider as set forth in claim 1 wherein the central resonator junction has the transmission lines coupled therewith in a spaced relationship from one to the next transmission line.
Claim 11
Dependent Claim
29 words
A matched reciprocal power divider as set forth in claim 9 wherein said central resonator junction has separate peripheral wall segments interconneting the ports one to the next adjacent.
Claim 12
Dependent Claim
56 words
A matched reciprocal power divider as set forth in claim 1 wherein reflection coefficient is established in accordance with the following equations: ##EQU5## wherein P 1 , P 2 and P 3 are normalized powers corresponding respectively to said first, second and third power level detectors and θ is the angle associated with the quantity |Γ|.
Claim 13
Dependent Claim
142 words
A matched lossless reciprocal power divider used for the measurement of reflection coefficient and comprising; five transmission lines defining five ports of the divider, one of said ports forming an input port and at least another of said ports forming an output port, a central resonator region, means intercoupling the transmission lines to the central resonator region to enable power division between the input and output ports, said central resonator having the transmission lines coupled therewith in a spaced relation from one to the next transmission line, first, second and third power level detectors, means coupling the the first, second and third power level detectors to the remaining three ports, respectively, and a directional coupler associated with the transmission line coupling to the one port and including means coupled from the coupler for monitoring the incident power coupled to the resonator region.
Claim 14
Dependent Claim
142 words
A matched lossless reciprocal power divider used for the measurement of reflection coefficient and comprising; five transmission lines defining five ports of the divider, one of said ports forming an input port and at least another of said ports forming an output port, a central resonator region, means intercoupling the transmission lines to the central resonator region to enable power division between the input and output ports, said central resonator having the transmission lines coupled therewith in a spaced relation from one to the next transmission line, first, second and third power level detectors, means coupling the the first, second and third power level detectors to the remaining three ports, respectively, and a directional coupler associated with the transmission line coupling to the one port and including means coupled from the coupler for monitoring the incident power coupled to the resonator region.
Claim 15
Dependent Claim
21 words
A matched reciprocal power divider as set forth in claim 12 wherein the divider is characterized by five fold rotational symmetry.
Claim 16
Dependent Claim
27 words
A matched reciprocal power divider as set forth in claim 13 wherein said means coupled from the coupler for monitoring the incident power comprises a reference detector.
Claim 17
Dependent Claim
19 words
A matched reciprocal power divider as set forth in claim 12 wherein each matching network comprises a matching transformer.
Claim 18
Dependent Claim
15 words
A matched reciprocal power divider as set forth in claim 12 made in stripline construction.
Claim 19
Dependent Claim
15 words
A matched reciprocal power divider as set forth in claim 12 made in waveguide construction.
Claim 20
Dependent Claim
15 words
A matched reciprocal power divider as set forth in claim 12 made in microstrip construction.
Claim 21
Dependent Claim
18 words
A matched reciprocal power divider as set forth in claim 12 wherein the divider has only five ports.
Claim 22
Dependent Claim
30 words
A matched reciprocal power divider as set forth in claim 12 wherein all ports are disposed radially of the central resonator junction and are disposed in a substantially planar interrelationship.
Claim 23
Dependent Claim
30 words
A matched reciprocal power divider as set forth in claim 12 wherein the central resonator junction has separate peripheral wall segments interconnecting the ports one to the next adjacent port.
Claim 24
Dependent Claim
56 words
A matched reciprocal power divider as set forth in claim 12 wherein reflection coefficient is established in accordance with the following equations: ##EQU6## wherein P 1 , P 2 and P 3 are normalized powers corresponding respectively to said first, second and third power level detectors and θ is the angle associated with the quantity |Γ|.
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) | 1987-01-23 | 1987-07-25 | 1988-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-23 | 1991-07-25 | 1992-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-23 | 1995-07-25 | 1996-01-24 | $7700.00 | Window Closed / Lapsed |