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What is the rule of thumb for the upper limit of the outside to outside width of a coplanar stripline transmission line (compared to a wavelength).
Also, besides the minimum trace width and minimum gap width manufacturable, what are the upper/lower bounds on the width to gap ratio in order to...
When viewing say my input impedance simulation results in FEKO, there are options for choosing which frequency, solution (solution number), or source (block number) to plot. For most simulations, the solution number allows me to choose the port I want to plot the input impedance for. However...
Ok, some easier questions:
lamda_g = 597.2 um
h_substrate = ~500 um
h_conductor = 0.2 um
Can I just model the conductor as a planar structure with perfect E boundary conditions? Or should I simulate it as a solid (finite thickness) PEC?
Can I just extend the substrate lamda_g/3 below the...
This is the first time I've done CPS in any simulation software. So I'm not sure on ports. I have a section of CPS transmission line with a wave-port on each side, thick substrate, and no ground plane. In HFSS do I want to have my wave-port surround both traces and use two port modes? If so do I...
In HFSS, draw the cross section of the helix (where it will be located at the bottom of the helix). Select your cross section surface and then from the Draw menu, choose Helix. Then you set the properties of the helix and choose the center point of the helix.
Here is an image of the antenna and wave-port. I just made it much wider. Now it extends across the other arms and not just the feed arm of the dipole. Also, when doing a port only solution, how do I view the E-field of the modes so I can check to make sure the correct modes are used for the...
I'm simulating a multiple fold dipole antenna for 200 GHz (lamda_g = 597.2 um). The antenna is folded 4 times (has 5 poles) for very high impedance. The antenna width and arm spacing is 0.02*lamda_g. The feed gap is 24.5 um. So I made the wave-port 24.5 by (s + w) um. Is this acceptable? Or is a...
I have the attached quadrifilar drawn in FEKO. What type of port should I use? In HFSS I put a lumped port at each feed (the bottom 4 traces) and excited them each with the necessary angle. But I'm not sure which port to use in FEKO. Also, let me know if there are any comments on how I have it...
quadrifilar antenna
Or are 0.5*lamda lengths used, except this is the electrical length of the helix and not the axial length? No papers have a good diagram and explicitly explain which lengths they refer to.
quadrifilar helical antenna
I'm trying to decide on the axial length and diameter of a 1/2 turn, lamda/2 quadrifilar helical antenna. I've read that one good geometry is 0.27*lamda in height (or axial length) and 0.18*lamda in diameter. So I'm wondering, when people call it the lamda/2 quad...
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