Reflection coefficient measurements
First Claim
1. Apparatus for measuring the reflection coefficient of a device by detecting normalized power level, comprising;
- main coupling means having means for receiving a test signal and means for coupling to the device being measured,first and second secondary coupling means associated with the main coupling means,first and second detectors associated, respectively, with the first and second secondary coupling means,and means coupling each secondary coupling means to the main coupling means with the normalized power levels P1 and P2 respectively associated with the first and second detectors being provided in accordance with the following equations;
space="preserve" listing-type="equation">P.sub.1 =1+|Γ
|.sup.2 +2|Γ
| cos θ
space="preserve" listing-type="equation">P.sub.2 =1+|Γ
.sup.2 30 2|Γ
| sine θ
where |Γ
| is the magnitude of the reflection coefficient and θ
is its phase.
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Abstract
A compact apparatus for the accurate measurement of complex reflection coefficients and VSWR of a device over either a waveguide bandwidth or multi-octave bandwidth by preferably measuring two power levels at detectors associated with the device. The device is formed by a main coupling means which in one embodiment is a main guide arm having means for receiving a test signal and means for transmitting the signal to the device being measured. In addition to the main coupling means (arms) there are also provided detector arms each having a detector associated therewith and means coupling signals from the main arm to the detector arms with the overall design being controlled in accordance with relatively simple formulae. The techniques of the invention are embodied herein in a waveguide embodiment, a stripline embodiment and a quasi-optical embodiment of the invention.
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Citations
28 Claims
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1. Apparatus for measuring the reflection coefficient of a device by detecting normalized power level, comprising;
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main coupling means having means for receiving a test signal and means for coupling to the device being measured, first and second secondary coupling means associated with the main coupling means, first and second detectors associated, respectively, with the first and second secondary coupling means, and means coupling each secondary coupling means to the main coupling means with the normalized power levels P1 and P2 respectively associated with the first and second detectors being provided in accordance with the following equations;
space="preserve" listing-type="equation">P.sub.1 =1+|Γ
|.sup.2 +2|Γ
| cos θ
space="preserve" listing-type="equation">P.sub.2 =1+|Γ
.sup.2 30 2|Γ
| sine θwhere |Γ
| is the magnitude of the reflection coefficient and θ
is its phase. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 26, 27)
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25. A four port apparatus for measuring the reflection coefficient of a device by detecting power levels, comprising;
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main coupling means having means defining a first port for receiving a test signal and means defining a second port for coupling to the device being measured, first and second secondary coupling means having means defining third and fourth ports, respectively of the apparatus, first and second detectors connected respectively at the third and fourth ports, and means coupling each secondary coupling means to the main coupling means such that when feeding a signal into one secondary port the signals from the first and second ports are the same and when feeding the other secondary port the signals from the first and second ports differ only in a phase difference of 90°
. - View Dependent Claims (28)
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Specification