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Hey SC,
It's been a while since we've last corresponded. Thanks for the ideas. I've used the metamaterial document from Ansoft (Left-Handed Metamaterial Design Guide) before. I'm following it pretty closely.
I've gone ahead and reduced the number of converged passes from 3 to 1, in hopes this...
Hey Everybody,
I'm using HFSS version 12 to solve for the eigenmodes of a double-dielectric material that is thought to act as a DNG metamaterial around 17 GHz. I've been searching around the Brillouin zone for my little window around 17 GHz to no avail until recently. I had to be very specific...
Hey SC,
Okay - yes. My goals are very unclear right now. I'd like to try two things with my metamaterial:
1) Utilize it as a high-impedance ground plane such that I reduce backward radiation, and
2) Utilize it as a superstrate to improve overall antenna gain.
I won't be disappointed if I can...
Hey SC,
So I've finally gotten around to all this stuff; It is not trivial at all. I've read Dan's paper and it's very good. I do think that I have a high-impedance ground plane despite it's dielectric nature. Because of the physical attributes of my metamaterial, however, it gives me some...
Hey SC,
Thanks. I've downloaded Dan's paper and will read it ASAP. I'll also look through that whole Ansoft Metamaterails thing again. I'm at work presently and my work has very little to do with antennas (plasmas - the antenna is a side-project), so it may take me a while to get through all...
Hey Sam,
If you're only trying to simulate two patches, you might want to try simply using the symmetry planes. Master/slave boundaries are for replicating periodic structures - ie: arrays of antennas in one or two dimensions. If this is what you're going for, you should be able to draw another...
Hey SC,
This chapter is rather helpful, but I'm confused about some things. Maybe we can discuss them here and clear them up? I hope I'm not confusing you or making myself sound stupid, although the latter isn't unheard of...
I'm not totally clear on this dispersion diagram that they're trying...
Hey Nina,
That information is very helpful. I've been looking for this EpsilonEffective formula for a while now. I hope it's helpful for you, also.
Thanks!
- TT
Hey SC,
I remember reading this paper a while ago and not getting much out of it. Since then I've learned a lot about metamaterials, computational electromagnetics and HFSS. I'll give it another read and see how it comes out.
Also, I'm going to try imposing E/H symmetry axes as you've...
Hey-
You should be able to accomplish this by adding master-slave boundaries on only two edges. The master-slave boundary will extend the structure infinitely in the directions of the normal vectors of the surfaces that are being used as master-slave.
A few things to note about master-slave...
Hey,
I believe what you want to do is apply master-slave boundary conditions to your radiation space. These will make the electric field the same on the master and slave boundary within a given phase delay. It is HFSS's way of implementing a periodic structure without actually simulating many...
Hey SC,
I'm sad to say that I don't believe there's much symmetry that I can exploit here. The fields should be periodic, but I'm not sure that necessarily means symmetric. Also, from what I've read about the symmetric E/H boundaries, they're made to go in the middle of a port and drastically...
Hey sv,
From what I understand, there is no "rule" that says the substrate must be of a particular thickness. I've always understood this rule of thumb, however, to be in place such that all the radiation that reflects off the ground plane will interfere constructively instead of destructively...
Hey Nina,
So I've downloaded and looked at your file. It seems like you're more or less on the right track. From what I understand, the radiating patch should be approximately half a wavelength long and the substrate is typically a quarter wavelength thick. Because you have both free space and...
Hey Everybody,
I'm simulating a DNG metamaterial in HFSS 12.1. I've already investigated the far-field behavior by simulating a unit-cell, utilizing master-slave boundaries to force the unit-cell behavior to be replicated and forcing a plane wave to impinge upon the infinite sheet of...
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