EM Drive - User contributions [en]

Q Factor

2015-08-26T22:06:36Z

Cej:

The quality factor, also known as the '''Q factor''', '''Q value''', or just '''Q''', is a dimensionless parameter that characterizes the energy loss of a resonating cavity with respect to the energy stored in the cavity.
See the [[Wikipedia:Q factor|Wikipedia entry]] for a more general and detailed description.

There are multiple, incompatible ways to measure this parameter, and there has been considerable debate on the NSF forums as to which is most appropriate for the EM Drive.
Experimenters have so far reported the [[#Unloaded Q factor|unloaded Q factor]].
However, the [[#Loaded Q factor|loaded Q factor]] is generally considered the standard technique for measuring the Q factor of closed resonant cavities outside of the EM Drive research community.{{Citation needed|{{subst:DATE}}}}
This difference may explain why the published Q factors of EM Drives are much higher than what is considered possible outside of theory without using advanced techniques such as superconducting cavities.

There is no standard notation to distinguish between the method used.
We use [[#Loaded Q factor|'''QL''']] to explicitly denote the ''loaded'' Q factor and [[#Unloaded Q factor|'''Qu''']] to denote the ''unloaded'' Q factor.

== Loaded Q factor (QL) ==

This is typically used for resonant cavities.

=== Method ===
Measure the S12 or S21 2-port return loss.
See http://docs.lumerical.com/en/diffractive_optics_cavity_q_calculation.html
and http://www-elsa.physik.uni-bonn.de/Lehrveranstaltungen/FP-E106/E106-Erlaeuterungen.pdf (German version).
== Unloaded Q factor (Qu) ==

This is typically used for antennas.

=== Method ===
Measure the S11 return loss at the 3dB down bandwidth.

Main Page/Q Factor

2015-08-26T22:03:16Z

Cej: Cej moved page Main Page/Q Factor to Q Factor: consistent naming

#REDIRECT [[Q Factor]]

Q Factor

2015-08-26T22:03:15Z

Cej: Cej moved page Main Page/Q Factor to Q Factor: consistent naming

The quality factor, also known as the '''Q factor''', '''Q value''', or just '''Q''', is a dimensionless parameter that characterizes the energy loss of a resonating cavity with respect to the energy stored in the cavity.
See the [[Wikipedia:Q factor|Wikipedia entry]] for a more general and detailed description.

There are multiple, incompatible ways to measure this parameter, and there has been considerable debate on the NSF forums as to which is most appropriate for the EM Drive.
Experimenters have so far reported the [[#Unloaded Q factor|unloaded Q factor]].
However, the [[#Loaded Q factor|loaded Q factor]] is generally considered the standard technique for measuring the Q factor of closed resonant cavities outside of the EM Drive research community.{{Citation needed|{{subst:DATE}}}}
This difference may explain why the published Q factors of EM Drives are much higher than what is considered possible outside of theory without using advanced techniques such as superconducting cavities.

There is no standard notation to distinguish between the method used.
We use [[#Loaded Q factor|'''Ql''']] to explicitly denote the ''loaded'' Q factor and [[#Unloaded Q factor|'''Qu''']] to denote the ''unloaded'' Q factor.

== Loaded Q factor (Ql) ==

This is typically used for resonant cavities.

=== Method ===
Measure the S12 or S21 2-port return loss.
See http://docs.lumerical.com/en/diffractive_optics_cavity_q_calculation.html
and http://www-elsa.physik.uni-bonn.de/Lehrveranstaltungen/FP-E106/E106-Erlaeuterungen.pdf (German version).
== Unloaded Q factor (Qu) ==

This is typically used for antennas.

=== Method ===
Measure the S11 return loss at the 3dB down bandwidth.

Q Factor

2015-08-26T19:54:44Z

Cej:

The quality factor, also known as the '''Q factor''', '''Q value''', or just '''Q''', is a dimensionless parameter that characterizes the energy loss of a resonating cavity with respect to the energy stored in the cavity.
See the [[Wikipedia:Q factor|Wikipedia entry]] for a more general and detailed description.

There are multiple, incompatible ways to measure this parameter, and there has been considerable debate on the NSF forums as to which is most appropriate for the EM Drive.
Experimenters have so far reported the [[#Unloaded Q factor|unloaded Q factor]].
However, the [[#Loaded Q factor|loaded Q factor]] is generally considered the standard technique for measuring the Q factor of closed resonant cavities outside of the EM Drive research community.{{Citation needed|{{subst:DATE}}}}
This difference may explain why the published Q factors of EM Drives are much higher than what is considered possible outside of theory without using advanced techniques such as superconducting cavities.

There is no standard notation to distinguish between the method used.
We use [[#Loaded Q factor|'''Ql''']] to explicitly denote the ''loaded'' Q factor and [[#Unloaded Q factor|'''Qu''']] to denote the ''unloaded'' Q factor.

== Loaded Q factor (Ql) ==

This is typically used for resonant cavities.

=== Method ===
Measure the S12 or S21 2-port return loss.
See http://docs.lumerical.com/en/diffractive_optics_cavity_q_calculation.html.

== Unloaded Q factor (Qu) ==

This is typically used for antennas.

=== Method ===
Measure the S11 return loss at the 3bd down bandwidth.

Q Factor

2015-08-26T19:47:05Z

Cej:

The quality factor, also known as the "Q factor", "Q value", or just "Q", is a dimensionless parameter that characterizes the energy loss of a resonating cavity with respect to the energy stored in the cavity.
See the [[Wikipedia:Q factor|Wikipedia entry]] for a more general and detailed description.

There are multiple, incompatible ways to measure this parameter, and there has been considerable debate on the NSF forums as to which is most appropriate for the EM Drive.
Experimenters have so far reported the [[#Unloaded Q factor|unloaded Q factor]].
However, the [[#Loaded Q factor|loaded Q factor]] is generally considered the standard technique for measuring the Q factor of closed resonant cavities outside of the EM Drive research community.{{Citation needed|{{subst:DATE}}}}
This difference may explain why the published Q factors of EM Drives are much higher than what is considered possible outside of theory without using advanced techniques such as superconducting cavities.

There is no standard notation to distinguish between the method used.
We use [[#Loaded Q factor|"Ql"]] to explicitly denote the ''loaded'' Q factor and [[#Unloaded Q factor|"Qu"]] to denote the ''unloaded'' Q factor.

== Loaded Q factor (Ql) ==

This is typically used for resonant cavities.

=== Method ===
Measure the S12 or S21 2-port return loss.
See http://docs.lumerical.com/en/diffractive_optics_cavity_q_calculation.html.

== Unloaded Q factor (Qu) ==

This is typically used for antennas.

=== Method ===
Measure the S11 return loss at the 3bd down bandwidth.

Q Factor

2015-08-26T19:46:38Z

Cej:

The quality factor, also known as the "Q factor", "Q value", or just "Q", is a dimensionless parameter that characterizes the energy loss of a resonating cavity with respect to the energy stored in the cavity.
See the [[Wikipedia:Q factor|Wikipedia entry]] for a more general and detailed description.

There are multiple, incompatible ways to measure this parameter, and there has been considerable debate on the NSF forums as to which is most appropriate for the EM Drive.
Experimenters have so far reported the [[#Unloaded Q factor|unloaded Q factor]].
However, the [[#Loaded Q factor|loaded Q factor]] is generally considered the standard technique for measuring the Q factor or closed resonant cavities outside of the EM Drive research community.{{Citation needed|{{subst:DATE}}}}
This difference may explain why the published Q factors of EM Drives are much higher than what is considered possible outside of theory without using advanced techniques such as superconducting cavities.

There is no standard notation to distinguish between the method used.
We use [[#Loaded Q factor|"Ql"]] to explicitly denote the ''loaded'' Q factor and [[#Unloaded Q factor|"Qu"]] to denote the ''unloaded'' Q factor.

== Loaded Q factor (Ql) ==

This is typically used for resonant cavities.

=== Method ===
Measure the S12 or S21 2-port return loss.
See http://docs.lumerical.com/en/diffractive_optics_cavity_q_calculation.html.

== Unloaded Q factor (Qu) ==

This is typically used for antennas.

=== Method ===
Measure the S11 return loss at the 3bd down bandwidth.

Q Factor

2015-08-26T19:45:37Z

Cej:

The quality factor, also known as the "Q factor", "Q value", or just "Q", is a dimensionless parameter that characterizes the energy loss of a resonating cavity with respect to the energy stored in the cavity.
See the [[Wikipedia:Q factor|Wikipedia entry]] for a more general and detailed description.

There are multiple, incompatible ways to measure this parameter, and there has been considerable debate on the NSF forums as to which is most appropriate for the EM Drive.
Publicized experiments have so far reported the [[#Unloaded Q factor|unloaded Q factor]].
However, the [[#Loaded Q factor|loaded Q factor]] is generally considered the standard technique for measuring the Q factor or closed resonant cavities outside of the EM Drive research community.{{Citation needed|{{subst:DATE}}}}
This difference may explain why the published Q factors of EM Drives are much higher than what is considered possible outside of theory without using advanced techniques such as superconducting cavities.

There is no standard notation to distinguish between the method used.
We use [[#Loaded Q factor|"Ql"]] to explicitly denote the ''loaded'' Q factor and [[#Unloaded Q factor|"Qu"]] to denote the ''unloaded'' Q factor.

== Loaded Q factor (Ql) ==

This is typically used for resonant cavities.

=== Method ===
Measure the S12 or S21 2-port return loss.
See http://docs.lumerical.com/en/diffractive_optics_cavity_q_calculation.html.

== Unloaded Q factor (Qu) ==

This is typically used for antennas.

=== Method ===
Measure the S11 return loss at the 3bd down bandwidth.

Q Factor

2015-08-26T19:41:39Z

Cej:

The quality factor, also known as the "Q factor", "Q value", or just "Q", is a dimensionless parameter that characterizes the energy loss of a resonating cavity with respect to the energy stored in the cavity.
See the [[Wikipedia:Q factor|Wikipedia entry]] for a more general and detailed description.

There are multiple, incompatible ways to measure this parameter, and there has been considerable debate on the NSF forums as to which is most appropriate for the EM Drive.
Publicized experiments have so far reported the [[#Unloaded Q factor|unloaded Q factor]].
However, the [[#Loaded Q factor|loaded Q factor]] is generally considered the standard technique for measuring the Q factor or closed resonant cavities outside of the EM Drive research community.{{Citation needed|{{subst:DATE}}}}

There is no standard notation to distinguish between the method used.
We use [[#Loaded Q factor|"Ql"]] to explicitly denote the ''loaded'' Q factor and [[#Unloaded Q factor|"Qu"]] to denote the ''unloaded'' Q factor.

== Loaded Q factor (Ql) ==

This is typically used for resonant cavities.

=== Method ===
Measure the S12 or S21 2-port return loss.
See http://docs.lumerical.com/en/diffractive_optics_cavity_q_calculation.html.

== Unloaded Q factor (Qu) ==

This is typically used for antennas.

=== Method ===
Measure the S11 return loss at the 3bd down bandwidth.

Q Factor

2015-08-26T19:39:29Z

Cej:

The quality factor, also known as the "Q factor", "Q value", or just "Q", is a dimensionless parameter that characterizes the energy loss of a resonating cavity with respect to the energy stored in the cavity.
See the [[Wikipedia:Q factor|Wikipedia entry]] for a more general and detailed description.
There are multiple, incompatible ways to measure this parameter, and there has been considerable debate on the NSF forums as to which is most appropriate for the EM Drive.
Regardless, publicized experiments have so far reported the [[#Unloaded Q factor|unloaded Q factor]], even though the [[#Loaded Q factor|loaded Q factor]] is generally considered the standard technique outside of the EM Drive research community.{{Citation needed|{{subst:DATE}}}}

There is no standard notation to distinguish between the method used.
We use [[#Loaded Q factor|"Ql"]] to explicitly denote the ''loaded'' Q factor and [[#Unloaded Q factor|"Qu"]] to denote the ''unloaded'' Q factor.

== Loaded Q factor (Ql) ==

This is typically used for resonant cavities.

=== Method ===
Measure the S12 or S21 2-port return loss.
See http://docs.lumerical.com/en/diffractive_optics_cavity_q_calculation.html.

== Unloaded Q factor (Qu) ==

This is typically used for antennas.

=== Method ===
Measure the S11 return loss at the 3bd down bandwidth.

Q Factor

2015-08-26T19:20:47Z

Cej:

Q Factor

2015-08-26T19:17:17Z

Cej:

Q Factor

2015-08-26T19:16:10Z

Cej:

Q Factor

2015-08-26T19:15:32Z

Cej: fixed section links

Q Factor

2015-08-26T19:06:57Z

Cej: Added article for the Q factor, hoping to explain the controversy between the nonstandard "unloaded" Q factor used in EM Drive experiments versus the standard "loaded" Q factor