Lumped resistor in traveling wave antenna
I have two questions
1. How should I simulate the lumped resistor?
I have tried using the RLC boundary condition on a sheet but on simulating that in a standalone project the return loss doesn"t show me the assigned value (240 ohm)
2. How should I feed the structure ie how should I connect the long wire, the resistor to the cylindrical probes (7 mm)
On simulating I don't see a traveling wave current profile (constant amplitude) on the antenna. I believe the error is coming from the questions I have posted above.
Any help will be greatly appreciated.
Thanks
Gaurav
I am interested in knowing the solution to this as well.
I think you need to modify your structure as following:
1. First of all, your TWA does not have any thickness, it's not very practical. Use 17um or 35um thick (if you build it on a common substrate) TWA.
2. Your ground also does not have any thickness. Use the same like previous.
3. You coaxial feed does have an inner conductor (hot-wire). What about the outer conductor of the coaxial? So, draw another cylinder of pec around your air-coax, that will serve as the outer conductor.
4. Remove the via and RLC. you can use a lumped port instead of the resistor. Use the lumped port impedance with the value of your terminating resistor.
then simulate your structure. if you have any other question, please let me know.
regards,
Shameem
Added after 1 hours 24 minutes:
I have changed your structure in the attached file (I also increased the lenght of TWA). Do the simulation and take a look at the results.
However, it is not easy to put the lumped resistor as lumped port in HFSS which is very easy in CST or ADS momentum. can you use those for your simulation?
best regards,
shameem
Hi Shameem
Thanks a lot. I am running the simulations now. Will let you know how it goes :)
Yes I was trying earlier to simulate the TWA in ADS momentum but didn't know how to simulate lumped resistor ... thanks for pointing out that I can used lumped port!
Donating points to you :)
Cheers
Gaurav