sehun1119
Junior Member level 1
Hi, my name is kook and I am new to this forum and this antenna area.
I am to design a microstrip patch antenna in multi-layer stack-up.
Here is how it looks like. I have 6 metals (M1 to M6) and 5 dielective substrates.
Each metal has a thickness of 0.7 mils, and its width and lengh are not determined yet.
M1
er = 3.38, loss tan = 0.0035, thickness=12mils
M2
er = 2.95, loss tan = 0.002, thickness=1mil
M3
er = 3.54, loss tan = 0.0035, thickness=4mils
M4
er = 2.95, loss tan = 0.002, thickness = 1mil
M5
er = 3.38, loss tan = 0.0035, thickness=12mils
M6
To the best of my knowledge, the microstrip patch antenna has a sandwitch shape of 1 dielectric in the middle of between 2 conductors, but I have got multi-layers. So, I would consider M6 as a GND plane, M1 as a patch and the others as one dielectric substrate. To start designing the dimension of the patch, I would have to know the permittivity and the thickness of the substrate. Well, the thickness of that dielectric would be calculated by summing all the metals and substrates between M1 and M6, but I am stuck with finding permittivity.
One thing I am thinking to solve it is to put all the layers with the specs in HFSS, simulate it and find the resonant frequency. Then,
(wave length) / 2 = length of the patch (or signal line)
(wave length) = c' / f = (c / sqrt(effective permittivity)) / (f)
From those two equations and HFSS simulation, I may obtain the effective permittivity. Is this the right method ?
Also, I have a little problem with HFSS. As I said above, I would try the simulation in HFSS. The operating frequency is 2.5 G Hz so that wave length in the air came out to be 0.12 meters ( wave length = c / f). So, I started it with the dimension of (0.06 meter by 0.06 meter - half wave length) for all the metals and substrates with its thickness. Therefore, the ground plane (M6) and the patch (M1) have the same dimension actually. I wonder how to determine the dimension of ground plane and the other metals except the patch. (I think the patch of M1 is good with 0.06 meters by 0.06 meters, right? ) After that, I wonder what type of port (lumped or wave? ) should I use??
Sorry for too many questions. I do not have really any idea how to start it from.
How do you guys design the microstrip patch antenna in multi-layers ?
Any help or advice would be very appreciated.
Thank you all!!!
I am to design a microstrip patch antenna in multi-layer stack-up.
Here is how it looks like. I have 6 metals (M1 to M6) and 5 dielective substrates.
Each metal has a thickness of 0.7 mils, and its width and lengh are not determined yet.
M1
er = 3.38, loss tan = 0.0035, thickness=12mils
M2
er = 2.95, loss tan = 0.002, thickness=1mil
M3
er = 3.54, loss tan = 0.0035, thickness=4mils
M4
er = 2.95, loss tan = 0.002, thickness = 1mil
M5
er = 3.38, loss tan = 0.0035, thickness=12mils
M6
To the best of my knowledge, the microstrip patch antenna has a sandwitch shape of 1 dielectric in the middle of between 2 conductors, but I have got multi-layers. So, I would consider M6 as a GND plane, M1 as a patch and the others as one dielectric substrate. To start designing the dimension of the patch, I would have to know the permittivity and the thickness of the substrate. Well, the thickness of that dielectric would be calculated by summing all the metals and substrates between M1 and M6, but I am stuck with finding permittivity.
One thing I am thinking to solve it is to put all the layers with the specs in HFSS, simulate it and find the resonant frequency. Then,
(wave length) / 2 = length of the patch (or signal line)
(wave length) = c' / f = (c / sqrt(effective permittivity)) / (f)
From those two equations and HFSS simulation, I may obtain the effective permittivity. Is this the right method ?
Also, I have a little problem with HFSS. As I said above, I would try the simulation in HFSS. The operating frequency is 2.5 G Hz so that wave length in the air came out to be 0.12 meters ( wave length = c / f). So, I started it with the dimension of (0.06 meter by 0.06 meter - half wave length) for all the metals and substrates with its thickness. Therefore, the ground plane (M6) and the patch (M1) have the same dimension actually. I wonder how to determine the dimension of ground plane and the other metals except the patch. (I think the patch of M1 is good with 0.06 meters by 0.06 meters, right? ) After that, I wonder what type of port (lumped or wave? ) should I use??
Sorry for too many questions. I do not have really any idea how to start it from.
How do you guys design the microstrip patch antenna in multi-layers ?
Any help or advice would be very appreciated.
Thank you all!!!