Do have a dumb question regarding thermal lift. Even if the magnetron is removed from the frustum assembly, it will generate heat around it's tube, thereby creating lift. If it is mechanically attached to the frustum, wouldn't the lift be simply recentered?
There will be less conductive heating of the frustum, depending on how far away and the interconnects used, but the maggy itself will remain hot, regardless...
Yes, that's essentially correct. The magnetron is what gets hottest. As long as the magnetron is mechanically attached to the fustrum, the lift created by the natural thermal convection currents from the magnetron will carry the frustum with it, so having the magnetron attached to a waveguide doesn't seem to improve things since it makes everything heavier (bad) and there is no improvement because the magnetron is still mechanically attached.
A possible improvement is to provide more and better heat sink to the magnetron.
Pure aluminum has a conductivity of 230 W/m-K. Copper is better: 390 W/m-K which means a 70% increase in conduction over aluminum. That’s the good news. The down side of copper is that it weighs three times more than aluminum, costs the same on a per pound basis and is more difficult to machine. Due to limited high temperature formability, a copper extrusion will not yield the same detail as aluminum. Also, machining copper takes more time and wears cutters at a much higher rate. However, when an application is limited in conduction, copper is a commonly used alternative.
Forced convection from a fan is out of consideration as it would interfere with the measurement. Liquid cooling is difficult to implement.
@rfmwguy
You could use a electrical heat source close to the magnetron position in your setup, and than look what the laserpoint does while a blind test...
Do have a dumb question regarding thermal lift. Even if the magnetron is removed from the frustum assembly, it will generate heat around it's tube, thereby creating lift. If it is mechanically attached to the frustum, wouldn't the lift be simply recentered?
There will be less conductive heating of the frustum, depending on how far away and the interconnects used, but the maggy itself will remain hot, regardless...
Yes, that's essentially correct. The magnetron is what gets hottest. As long as the magnetron is mechanically attached to the fustrum, the lift created by the natural thermal convection currents from the magnetron will carry the frustum with it, so having the magnetron attached to a waveguide doesn't seem to improve things since it makes everything heavier (bad) and there is no improvement because the magnetron is still mechanically attached.
A possible improvement is to provide more and better heat sink to the magnetron.
Pure aluminum has a conductivity of 230 W/m-K. Copper is better: 390 W/m-K which means a 70% increase in conduction over aluminum. That’s the good news. The down side of copper is that it weighs three times more than aluminum, costs the same on a per pound basis and is more difficult to machine. Due to limited high temperature formability, a copper extrusion will not yield the same detail as aluminum. Also, machining copper takes more time and wears cutters at a much higher rate. However, when an application is limited in conduction, copper is a commonly used alternative.
Forced convection from a fan is out of consideration as it would interfere with the measurement. Liquid cooling is difficult to implement.
This magnetron for example, requires water cooling:
http://www.ok1rr.com/tubes/burle/s94608e.pdfLiquid Cooling:
Tube anode requires liquid cooling Liquid flow must start
before application of filament voltage and, preferably,
continue for several minutes after removing voltage.
Interlock filament power supply with liquid flow to prevent
tube damage due to inadequate liquid flow. When liquid is
water, use of distilled or filtered deionized water is
essential.
Water Flow .... (15 kW anode dissipation) 20.4 I/min. (5.5 gpm)
It is a 0.95GHz magnetron though (instead of 2.45GHz)
@rfmwguy
You could use a electrical heat source close to the magnetron position in your setup, and than look what the laserpoint does while a blind test...
Yes, I'm about to steal my wife's Cuisinart Grille and put underneath the frustum...Oh-oh...now I've done it...she reads my posts sometimes.
Do have a dumb question regarding thermal lift. Even if the magnetron is removed from the frustum assembly, it will generate heat around it's tube, thereby creating lift. If it is mechanically attached to the frustum, wouldn't the lift be simply recentered?
There will be less conductive heating of the frustum, depending on how far away and the interconnects used, but the maggy itself will remain hot, regardless...
Yes, that's essentially correct. The magnetron is what gets hottest. As long as the magnetron is mechanically attached to the fustrum, the lift created by the natural thermal convection currents from the magnetron will carry the frustum with it, so having the magnetron attached to a waveguide doesn't seem to improve things since it makes everything heavier (bad) and there is no improvement because the magnetron is still mechanically attached.
A possible improvement is to provide more and better heat sink to the magnetron.
Pure aluminum has a conductivity of 230 W/m-K. Copper is better: 390 W/m-K which means a 70% increase in conduction over aluminum. That’s the good news. The down side of copper is that it weighs three times more than aluminum, costs the same on a per pound basis and is more difficult to machine. Due to limited high temperature formability, a copper extrusion will not yield the same detail as aluminum. Also, machining copper takes more time and wears cutters at a much higher rate. However, when an application is limited in conduction, copper is a commonly used alternative.
Forced convection from a fan is out of consideration as it would interfere with the measurement. Liquid cooling is difficult to implement.
I wonder if some of the massive server/PC copper heatsinks would be a good idea? They're commodity items, I've even got some giant ones lying around, free to a good home.
http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&DEPA=0&Order=BESTMATCH&Description=copper+heatsink&N=4115&isNodeId=1
Do have a dumb question regarding thermal lift. Even if the magnetron is removed from the frustum assembly, it will generate heat around it's tube, thereby creating lift. If it is mechanically attached to the frustum, wouldn't the lift be simply recentered?
There will be less conductive heating of the frustum, depending on how far away and the interconnects used, but the maggy itself will remain hot, regardless...
Yes, that's essentially correct. The magnetron is what gets hottest. As long as the magnetron is mechanically attached to the fustrum, the lift created by the natural thermal convection currents from the magnetron will carry the frustum with it, so having the magnetron attached to a waveguide doesn't seem to improve things since it makes everything heavier (bad) and there is no improvement because the magnetron is still mechanically attached.
A possible improvement is to provide more and better heat sink to the magnetron.
Pure aluminum has a conductivity of 230 W/m-K. Copper is better: 390 W/m-K which means a 70% increase in conduction over aluminum. That’s the good news. The down side of copper is that it weighs three times more than aluminum, costs the same on a per pound basis and is more difficult to machine. Due to limited high temperature formability, a copper extrusion will not yield the same detail as aluminum. Also, machining copper takes more time and wears cutters at a much higher rate. However, when an application is limited in conduction, copper is a commonly used alternative.
Forced convection from a fan is out of consideration as it would interfere with the measurement. Liquid cooling is difficult to implement.
This magnetron for example, requires water cooling:
http://www.ok1rr.com/tubes/burle/s94608e.pdf
Liquid Cooling:
Tube anode requires liquid cooling Liquid flow must start
before application of filament voltage and, preferably,
continue for several minutes after removing voltage.
Interlock filament power supply with liquid flow to prevent
tube damage due to inadequate liquid flow. When liquid is
water, use of distilled or filtered deionized water is
essential.
Water Flow .... (15 kW anode dissipation) 20.4 I/min. (5.5 gpm)
It is a 0.95GHz magnetron though (instead of 2.45GHz)
A 0.915 GHz magnetron would have some benefits: the frustum would be slightly bigger to built, but the tolerance to achieve and maintain resonance would be easier than on a smaller frustum.
But at such a cost (how much?) for very high power, say a hundred to thousands of kilowatts, I wonder why those labs (like
CraigPichach's university) do not plan to use a much cleaner source of microwaves instead, like a klystron, which offers both high power and narrow band.
Magnetrons are ok because they are compact and that the 2.45 GHz models from ovens are really cheap. But with enough $$$ and other frequencies investigated, I think TWTAs and klystrons would do a better job.
EDIT: Whatever I'd love to see an experiment with an N
2-cooled frustum powered by a 100kW-class liquid-cooled magnetron! This would be waaaay beyond what we saw even from Shawyer.
Do have a dumb question regarding thermal lift. Even if the magnetron is removed from the frustum assembly, it will generate heat around it's tube, thereby creating lift. If it is mechanically attached to the frustum, wouldn't the lift be simply recentered?
There will be less conductive heating of the frustum, depending on how far away and the interconnects used, but the maggy itself will remain hot, regardless...
Yes, that's essentially correct. The magnetron is what gets hottest. As long as the magnetron is mechanically attached to the fustrum, the lift created by the natural thermal convection currents from the magnetron will carry the frustum with it, so having the magnetron attached to a waveguide doesn't seem to improve things since it makes everything heavier (bad) and there is no improvement because the magnetron is still mechanically attached.
A possible improvement is to provide more and better heat sink to the magnetron.
Pure aluminum has a conductivity of 230 W/m-K. Copper is better: 390 W/m-K which means a 70% increase in conduction over aluminum. That’s the good news. The down side of copper is that it weighs three times more than aluminum, costs the same on a per pound basis and is more difficult to machine. Due to limited high temperature formability, a copper extrusion will not yield the same detail as aluminum. Also, machining copper takes more time and wears cutters at a much higher rate. However, when an application is limited in conduction, copper is a commonly used alternative.
Forced convection from a fan is out of consideration as it would interfere with the measurement. Liquid cooling is difficult to implement.
This magnetron for example, requires water cooling:
http://www.ok1rr.com/tubes/burle/s94608e.pdf
Liquid Cooling:
Tube anode requires liquid cooling Liquid flow must start
before application of filament voltage and, preferably,
continue for several minutes after removing voltage.
Interlock filament power supply with liquid flow to prevent
tube damage due to inadequate liquid flow. When liquid is
water, use of distilled or filtered deionized water is
essential.
Water Flow .... (15 kW anode dissipation) 20.4 I/min. (5.5 gpm)
It is a 0.95GHz magnetron though (instead of 2.45GHz)
A 0.915 GHz magnetron would have some benefits: the frustum would be slightly bigger to built, but the tolerance to achieve and maintain resonance would be easier than on a smaller frustum.
But at such a cost (how much?) I wonder why the labs do not plan to use a much cleaner source of microwaves instead, like a klystron, which offers both high power and narrow band.
Magnetrons are ok because they are compact and that the 2.45 GHz models from ovens are really cheap. But with enough $$$ and other frequencies investigated, I think TWTAs and klystrons would do a better job.
Even better would be a high power maser. Think about the 3dB BW (~1 Hz) and the Q
Thought is that the time constants are associated more with the PLR and time it takes for the magnetron/frustrum to reach resonance as opposed to the "EM-Drive/Q-Thruster" phenomena (if real). If we are seeing Conservation of Momentum than this should occur basically at the speed of light. At 5MW with an industrial magnetron transmitter we will achieve resonance for sure within the 10us, and will demonstrate that by first measuring Q prior to attempting any measurement of thrust. Concern however is if Conservation of Momentum depends on "fluidization of the quantum vacuum"; again, does this occur at the speed of light or do we require cycles and if so, how many? The follow up 100kW continuous trial will then follow, just working on the frustrum cooling system (nitrogen).
Ironically there is a unit set up to do 5MW pulses that can adjust frequency within 10MHz of 930MHz ( frustum dimensions would not have to be exact that we could find resonance). At 10 microseconds the cooling of the frustum is managable without online cooling. Issue is would you see something in 10microseconds? Such a test hopefully could produce results that are an order of magnitude above background (into the ground no buoyant effects) or allow other phenomena (photon thruster leakage?) to be measurable. This will probably be experiment one as it is relatively cheap. If it's CoM I expect to see something on a digital scale within those 10us.
It's the duty cycle that matters in this case. If the 10 uS pulse happens once a Sec. you have a duty cycle of .001% and a time averaged power of 50 Watts, which is close to the power level the NASA team used. Because the mass you are trying to move is so much larger you would see less EM-Drive thrust (if it really exists) but you would also get more thermal, magnetic, and electrostatic effects. All of the EM-Drive "thrust" signatures disclosed so far have large time constants. So the effect of each individual 5 MW pulse would not be observable. This is just my opinion. I haven't done any EM-Drive experiments. I have been told I will soon be eating my words. I am still waiting...
Did I see an earlier description about a "digital scale" as the intended measurement method during these 10uS pulses? If so, I would think a different method for measuring movement will be needed; hard to imagine the time constants associated with a "digital scale" will be compatible with sub-100-millisecond, let alone something as fleeting as 10uS.
High resolution laser measurement would be nearly the only thing I could imagine capable of capturing effects of such a vanishingly small pulse in a 10uS timeframe; the apparatus isn't likely to move very far (maybe just "vibrate" due to inability to overcome static friction of bearings, etc). Plus, if the "thrust" effect is real, the stresses from a 5MW pulse on the materials of the frustum are an unknown... would they flex and deform like a spring, thereby dampening or potentially eliminating any measurable effect? My line of thought is that engineering a device to be able to operate at 5MW might involve more than just a microwave source, cavity shape/bandwidth, and good thermal management.
My intention is to simulate a real loop using phase matched dipoles or point sources, ignoring the mechanics of implementation. I think that is best because Shell can then approximate the real loop to the best of her ability. Hopefully the simulation and implementation will converge toward the same end result. But I need to go off and do that now.
aero
I don't see how multiple dipoles arranged in a circle simulates a loop, unless you're trying to implement a very high harmonic in the azimuthal direction. For TE012, there are only 2 poles around the circle.
Why is it difficult to simulate current through a piece of wire, fed by a current source?
Todd
Do have a dumb question regarding thermal lift. Even if the magnetron is removed from the frustum assembly, it will generate heat around it's tube, thereby creating lift. If it is mechanically attached to the frustum, wouldn't the lift be simply recentered?
There will be less conductive heating of the frustum, depending on how far away and the interconnects used, but the maggy itself will remain hot, regardless...
Yes, that's essentially correct. The magnetron is what gets hottest. As long as the magnetron is mechanically attached to the fustrum, the lift created by the natural thermal convection currents from the magnetron will carry the frustum with it, so having the magnetron attached to a waveguide doesn't seem to improve things since it makes everything heavier (bad) and there is no improvement because the magnetron is still mechanically attached.
A possible improvement is to provide more and better heat sink to the magnetron.
Pure aluminum has a conductivity of 230 W/m-K. Copper is better: 390 W/m-K which means a 70% increase in conduction over aluminum. That’s the good news. The down side of copper is that it weighs three times more than aluminum, costs the same on a per pound basis and is more difficult to machine. Due to limited high temperature formability, a copper extrusion will not yield the same detail as aluminum. Also, machining copper takes more time and wears cutters at a much higher rate. However, when an application is limited in conduction, copper is a commonly used alternative.
Forced convection from a fan is out of consideration as it would interfere with the measurement. Liquid cooling is difficult to implement.
This magnetron for example, requires water cooling:
http://www.ok1rr.com/tubes/burle/s94608e.pdf
Liquid Cooling:
Tube anode requires liquid cooling Liquid flow must start
before application of filament voltage and, preferably,
continue for several minutes after removing voltage.
Interlock filament power supply with liquid flow to prevent
tube damage due to inadequate liquid flow. When liquid is
water, use of distilled or filtered deionized water is
essential.
Water Flow .... (15 kW anode dissipation) 20.4 I/min. (5.5 gpm)
It is a 0.95GHz magnetron though (instead of 2.45GHz)
I think it's not just the temperature of the Magentron that is heating the air, but also the microwaves heating the water vapor in the air. So simply removing the heat caused by the hot metals is only half the problem. I think it would be easier to remove the air.
Todd
@rfmwguy
You could use a electrical heat source close to the magnetron position in your setup, and than look what the laserpoint does while a blind test...
Yes, I'm about to steal my wife's Cuisinart Grille and put underneath the frustum...Oh-oh...now I've done it...she reads my posts sometimes.
hahahahaa whew, that's very funny! I found one from a heating plate at the Re-Store used home equip for $3 bucks.
My intention is to simulate a real loop using phase matched dipoles or point sources, ignoring the mechanics of implementation. I think that is best because Shell can then approximate the real loop to the best of her ability. Hopefully the simulation and implementation will converge toward the same end result. But I need to go off and do that now.
aero
I don't see how multiple dipoles arranged in a circle simulates a loop, unless you're trying to implement a very high harmonic in the azimuthal direction. For TE012, there are only 2 poles around the circle.
Why is it difficult to simulate current through a piece of wire, fed by a current source?
Todd
Yes, we all knew from the beginning that the best thing is to use a circular loop and that was the starting recommendation, but he doesn't know how to input a circular loop in Meep, only knows how to input straight dipole antennas.
,,,I don't see how multiple dipoles arranged in a circle simulates a loop, unless you're trying to implement a very high harmonic in the azimuthal direction....
...
To understand that you have to start with the fact that so far, the only way that aero's Meep was able to excite a TE mode was by using two (2) long straight parallel dipole antennas. The problem with 2 long straight ones is that the TE012 mode excited was anisotropic (it looks like TE012 in only one plane). To excite an axi-symmetric TE012 mode, one needs to have a high n-multiple, instead of n=2. Mathematically, a circle is a polygon with n sides where n approaches Infinity.
...For TE012, there are only 2 poles around the circle...
That's incorrect.
The convention is TEmnp where m=circular, n= polar, p = longitudinal
Thus TE012 has m=0 which means
constant field in the circular (azimuthal) direction.
p=2 means two wave-patterns in the longitudinal direction
Do have a dumb question regarding thermal lift. Even if the magnetron is removed from the frustum assembly, it will generate heat around it's tube, thereby creating lift. If it is mechanically attached to the frustum, wouldn't the lift be simply recentered?
There will be less conductive heating of the frustum, depending on how far away and the interconnects used, but the maggy itself will remain hot, regardless...
Yes, that's essentially correct. The magnetron is what gets hottest. As long as the magnetron is mechanically attached to the fustrum, the lift created by the natural thermal convection currents from the magnetron will carry the frustum with it, so having the magnetron attached to a waveguide doesn't seem to improve things since it makes everything heavier (bad) and there is no improvement because the magnetron is still mechanically attached.
A possible improvement is to provide more and better heat sink to the magnetron.
Pure aluminum has a conductivity of 230 W/m-K. Copper is better: 390 W/m-K which means a 70% increase in conduction over aluminum. That’s the good news. The down side of copper is that it weighs three times more than aluminum, costs the same on a per pound basis and is more difficult to machine. Due to limited high temperature formability, a copper extrusion will not yield the same detail as aluminum. Also, machining copper takes more time and wears cutters at a much higher rate. However, when an application is limited in conduction, copper is a commonly used alternative.
Forced convection from a fan is out of consideration as it would interfere with the measurement. Liquid cooling is difficult to implement.
This magnetron for example, requires water cooling:
http://www.ok1rr.com/tubes/burle/s94608e.pdf
Liquid Cooling:
Tube anode requires liquid cooling Liquid flow must start
before application of filament voltage and, preferably,
continue for several minutes after removing voltage.
Interlock filament power supply with liquid flow to prevent
tube damage due to inadequate liquid flow. When liquid is
water, use of distilled or filtered deionized water is
essential.
Water Flow .... (15 kW anode dissipation) 20.4 I/min. (5.5 gpm)
It is a 0.95GHz magnetron though (instead of 2.45GHz)
I think it's not just the temperature of the Magentron that is heating the air, but also the microwaves heating the water vapor in the air. So simply removing the heat caused by the hot metals is only half the problem. I think it would be easier to remove the air.
Todd
Maybe remove the water in the air?
My intention is to simulate a real loop using phase matched dipoles or point sources, ignoring the mechanics of implementation. I think that is best because Shell can then approximate the real loop to the best of her ability. Hopefully the simulation and implementation will converge toward the same end result. But I need to go off and do that now.
aero
I don't see how multiple dipoles arranged in a circle simulates a loop, unless you're trying to implement a very high harmonic in the azimuthal direction. For TE012, there are only 2 poles around the circle.
Why is it difficult to simulate current through a piece of wire, fed by a current source?
Todd
I'm going to give you a piece or rope attached at one end to a plate 6 foot long. Your job if you should decide to accept Mr. Todd is to make the rope oscillate harmonically in a sustained wave pattern. Easy? Right. Any school kid will tell you that it is that has ever watched someone jumping rope. Now I going to put that rope in a cone shaped cavity where the osculating peaks of the waves hit the side walls of the cone shape. Your job is to find not only a standing wave up and down the rope length that is the same peak to peak but a particular one, at a particular frequency and rotating just so.
No, it's not that simple.
Do have a dumb question regarding thermal lift. Even if the magnetron is removed from the frustum assembly, it will generate heat around it's tube, thereby creating lift. If it is mechanically attached to the frustum, wouldn't the lift be simply recentered?
There will be less conductive heating of the frustum, depending on how far away and the interconnects used, but the maggy itself will remain hot, regardless...
Yes, that's essentially correct. The magnetron is what gets hottest. As long as the magnetron is mechanically attached to the fustrum, the lift created by the natural thermal convection currents from the magnetron will carry the frustum with it, so having the magnetron attached to a waveguide doesn't seem to improve things since it makes everything heavier (bad) and there is no improvement because the magnetron is still mechanically attached.
A possible improvement is to provide more and better heat sink to the magnetron.
Pure aluminum has a conductivity of 230 W/m-K. Copper is better: 390 W/m-K which means a 70% increase in conduction over aluminum. That’s the good news. The down side of copper is that it weighs three times more than aluminum, costs the same on a per pound basis and is more difficult to machine. Due to limited high temperature formability, a copper extrusion will not yield the same detail as aluminum. Also, machining copper takes more time and wears cutters at a much higher rate. However, when an application is limited in conduction, copper is a commonly used alternative.
Forced convection from a fan is out of consideration as it would interfere with the measurement. Liquid cooling is difficult to implement.
This magnetron for example, requires water cooling:
http://www.ok1rr.com/tubes/burle/s94608e.pdf
Liquid Cooling:
Tube anode requires liquid cooling Liquid flow must start
before application of filament voltage and, preferably,
continue for several minutes after removing voltage.
Interlock filament power supply with liquid flow to prevent
tube damage due to inadequate liquid flow. When liquid is
water, use of distilled or filtered deionized water is
essential.
Water Flow .... (15 kW anode dissipation) 20.4 I/min. (5.5 gpm)
It is a 0.95GHz magnetron though (instead of 2.45GHz)
I think it's not just the temperature of the Magentron that is heating the air, but also the microwaves heating the water vapor in the air. So simply removing the heat caused by the hot metals is only half the problem. I think it would be easier to remove the air.
Todd
Maybe remove the water in the air?
Yes, this fall and winter will be much better. All tests done had RH about 50-59%, which is common this time of the year. Funny though, I've never measure much of a heat rise on the frustum side or plate opposite magnetron just after a test. The mesh should dissipate heated air quickly.
My intention is to simulate a real loop using phase matched dipoles or point sources, ignoring the mechanics of implementation. I think that is best because Shell can then approximate the real loop to the best of her ability. Hopefully the simulation and implementation will converge toward the same end result. But I need to go off and do that now.
aero
I don't see how multiple dipoles arranged in a circle simulates a loop, unless you're trying to implement a very high harmonic in the azimuthal direction. For TE012, there are only 2 poles around the circle.
Why is it difficult to simulate current through a piece of wire, fed by a current source?
Todd
I'm going to give you a piece or rope attached at one end to a plate 6 foot long. Your job if you should decide to accept Mr. Todd is to make the rope oscillate harmonically in a sustained wave pattern. Easy? Right. Any school kid will tell you that it is that has ever watched someone jumping rope. Now I going to put that rope in a cone shaped cavity where the osculating peaks of the waves hit the side walls of the cone shape. Your job is to find not only a standing wave up and down the rope length that is the same peak to peak but a particular one, at a particular frequency and rotating just so.
No, it's not that simple.
Also, MEEP is not the easiest software to model arbritarily shaped antennae. This is the place where the MEEPers think that everyone should write their own function...
My intention is to simulate a real loop using phase matched dipoles or point sources, ignoring the mechanics of implementation. I think that is best because Shell can then approximate the real loop to the best of her ability. Hopefully the simulation and implementation will converge toward the same end result. But I need to go off and do that now.
aero
I don't see how multiple dipoles arranged in a circle simulates a loop, unless you're trying to implement a very high harmonic in the azimuthal direction. For TE012, there are only 2 poles around the circle.
Why is it difficult to simulate current through a piece of wire, fed by a current source?
Todd
Yes, we all knew from the beginning that the best thing is to use a circular loop and that was the starting recommendation, but he doesn't know how to input a circular loop in Meep, only knows how to input straight dipole antennas.
So can any of the available antenna design software output an antenna into a format MEEP likes?
http://www.arrl.org/antenna-modeling
My intention is to simulate a real loop using phase matched dipoles or point sources, ignoring the mechanics of implementation. I think that is best because Shell can then approximate the real loop to the best of her ability. Hopefully the simulation and implementation will converge toward the same end result. But I need to go off and do that now.
aero
I don't see how multiple dipoles arranged in a circle simulates a loop, unless you're trying to implement a very high harmonic in the azimuthal direction. For TE012, there are only 2 poles around the circle.
Why is it difficult to simulate current through a piece of wire, fed by a current source?
Todd
Yes, we all knew from the beginning that the best thing is to use a circular loop and that was the starting recommendation, but he doesn't know how to input a circular loop in Meep, only knows how to input straight dipole antennas.
So can any of the available antenna design software output an antenna into a format MEEP likes? http://www.arrl.org/antenna-modeling
It is not a problem of modellling the behavior of the antenna.
Once you input a straight dipole antenna into Meep, for example, Meep will do just as good or better a job at modelling the behavior of the antenna than any other software.
Instead it is a simple issue of inputting that current is flowing through a circular wire antenna, just the issue of inputting the circular shape into Meep in 3D Cartesian coordinates.
