Smith chart
E864053
The Smith chart is a graphical tool used in RF engineering to analyze and design transmission lines and matching networks by representing complex impedances and reflection coefficients.
All labels observed (4)
| Label | Occurrences |
|---|---|
| Smith chart canonical | 1 |
| admittance Smith chart | 1 |
| combined impedance-admittance Smith chart | 1 |
| impedance Smith chart | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T10437128 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Smith chart Context triple: [RF engineering, usesConcept, Smith chart]
-
A.
Nichols chart
A Nichols chart is a graphical design tool used in control engineering to analyze and shape the closed-loop frequency response by plotting open-loop gain versus phase on contour maps of constant closed-loop magnitude.
-
B.
Nyquist plot
The Nyquist plot is a graphical representation used in control engineering and signal processing to assess the stability and frequency response of linear time-invariant systems by plotting complex gain as a function of frequency.
-
C.
Bode plot
A Bode plot is a graphical representation of a linear system’s frequency response, showing magnitude and phase versus frequency on logarithmic scales, widely used in control and amplifier design.
-
D.
Cartesian circle
The Cartesian circle is a famous alleged circular reasoning in René Descartes’ Meditations, where his proof of God’s existence and his justification of clear and distinct perceptions appear to depend on each other.
-
E.
PowerChart
PowerChart is Cerner's flagship electronic health record (EHR) solution used by healthcare providers to document, manage, and access patient clinical information.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Smith chart Target entity description: The Smith chart is a graphical tool used in RF engineering to analyze and design transmission lines and matching networks by representing complex impedances and reflection coefficients.
-
A.
Nichols chart
A Nichols chart is a graphical design tool used in control engineering to analyze and shape the closed-loop frequency response by plotting open-loop gain versus phase on contour maps of constant closed-loop magnitude.
-
B.
Nyquist plot
The Nyquist plot is a graphical representation used in control engineering and signal processing to assess the stability and frequency response of linear time-invariant systems by plotting complex gain as a function of frequency.
-
C.
Bode plot
A Bode plot is a graphical representation of a linear system’s frequency response, showing magnitude and phase versus frequency on logarithmic scales, widely used in control and amplifier design.
-
D.
Cartesian circle
The Cartesian circle is a famous alleged circular reasoning in René Descartes’ Meditations, where his proof of God’s existence and his justification of clear and distinct perceptions appear to depend on each other.
-
E.
PowerChart
PowerChart is Cerner's flagship electronic health record (EHR) solution used by healthcare providers to document, manage, and access patient clinical information.
- F. None of above. chosen
Statements (52)
| Predicate | Object |
|---|---|
| instanceOf |
engineering diagram
ⓘ
graphical tool ⓘ nomogram ⓘ |
| assumes | reference impedance ⓘ |
| basedOn | complex reflection coefficient plane ⓘ |
| countryOfOrigin |
United States
ⓘ
linked to:
United States of America
|
| createdBy | Phillip H. Smith ⓘ |
| field |
electrical engineering
ⓘ
microwave engineering ⓘ radio-frequency engineering ⓘ |
| hasCoordinateSystem | polar coordinates ⓘ |
| hasDigitalForm |
Smith chart display in vector network analyzers
ⓘ
computer-aided Smith chart software ⓘ |
| hasFeature |
VSWR circles
ⓘ
circles of constant conductance ⓘ circles of constant reactance ⓘ circles of constant resistance ⓘ circles of constant susceptance ⓘ constant reflection coefficient magnitude circles ⓘ impedance and admittance duality ⓘ outer boundary corresponding to unity reflection coefficient magnitude ⓘ radial lines of constant reflection coefficient angle ⓘ |
| hasVariant |
admittance Smith chart
ⓘ
linked to:
Smith chart
combined impedance-admittance Smith chart ⓘ
linked to:
Smith chart
impedance Smith chart ⓘ
linked to:
Smith chart
|
| inception | 1930s ⓘ |
| maps |
load impedance to reflection coefficient
ⓘ
reflection coefficient to load impedance ⓘ transmission line position to phase of reflection coefficient ⓘ |
| relatedTo |
S-parameters
ⓘ
reflection coefficient ⓘ standing wave ratio ⓘ transmission line theory ⓘ |
| represents |
complex reflection coefficient
ⓘ
normalized admittance ⓘ normalized impedance ⓘ |
| typicallyUses |
50 ohm reference impedance
ⓘ
75 ohm reference impedance ⓘ |
| usedFor |
admittance matching
ⓘ
analyzing transmission lines ⓘ designing impedance matching networks ⓘ designing transmission lines ⓘ impedance matching ⓘ stability analysis of RF amplifiers ⓘ visualizing complex impedances ⓘ visualizing reflection coefficients ⓘ visualizing standing wave patterns ⓘ |
| usedIn |
RF circuit design
ⓘ
antenna matching ⓘ microwave network analysis ⓘ network analyzer measurements ⓘ transmission line education ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Smith chart Description of subject: The Smith chart is a graphical tool used in RF engineering to analyze and design transmission lines and matching networks by representing complex impedances and reflection coefficients.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Smith chart
linked to: Smith chart
linked to: Smith chart