Greetings. I have a query related to analysis of multilayer microstrip patch antenna. The confıguration is shown in the figure attached. The antenna is on the bottom layer where as feed is on the top layer. My Question is how we determine the resonance frequency of this configuration. Do we have to consider substrate thickness from ground layer to patch or from top layer to bottom. If we consider it from top to bottom then is there any updated version of resonance frequency formular
Thanks in advance
I don't find your description clear. Do you have a number of conducting layers that are much wider and longer than the patch, with a patch only on the bottom layer, or are all the layers the same size as the patch, with the edges of the metal layers sticking out past the edges of the dielectrics?
If the patch is on the bottom with a large ground plane the layer above it then it is mainly the patch dimensions and the dielectric between it and the ground that affect its frequency. The thickness or dielectric of the other layers will have no effect, except on the way it is fed.
The way it is fed can affect its frequency a little bit, and its bandwidth.
Mr. Malcolm White Thank You for answer.
Antenna configuration is such that
Patch antenna is on 20mil substrate then there is a complete ground covering the whole other side of substrate. Ground is followed by an other substrate layer of same material. Then there is power layer to route power signal between different layer. Then we have substrate layer again and at the end there is antenna feed and feed and other circuits. The patch is excited through via.
From you answer it means that as ground is completely covering so resonance frequency mainly just depends on substrate layer between ground.
The substate material and the patch shape.
You will need to take the feed ground through all the layers too, using vias, maybe 4 or more round the feed via.
Hope this will help
1. Kumud Ranjan Jha, Ghanshyam Singh. Terahertz Planar Antennas for Next Generation Communication (2014), Chapter 2, pp. 23-26
2. F. Hu and J. Song, ―Modeling of Multilayered Media Using Effective Medium Theory,‖ vol. 1, no. 2, pp. 225–228, 2010.
3. Article A tri‐band and miniaturized planar antenna based on counters...
4. Ali WKW, Al-Charchafchi SH. Using equivalent dielectric constant to simplify the analysis of patch microstrip antenna with multi-layer substrates. Paper presented at: IEEE Antennas Propag Soc Int Symp 1998 Dig - Antennas Gateways to Glob
Netw - Held Conjunction with Usn Natl Radio Sci Meet 1998; 676–679. https://doi.org/10.1109/APS.1998.702028
Dear Noaman Naseer , you can use HFSS or other similar simulators to calculate the resonance frequency.
Dear Vadym Slyusar Sir I am using HFSS my point of ponder was like for multilayer substrate we have an updated formulas to calculate dielectric constant based of filing factor. In my scenario the same substrate is stacked on each other separated by conducting layer. I was wondering that for calculation and mathematical modeling do we take substrate thickness with respect to ground which is 20 mil apart form antenna or from feed which is 41 mil apart.
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