AN043 PCB Antenna for 2 layer Board

Nitish Dhiman

Hi,

I am referring AN043 for PCB antenna design. we are not getting any response with 2 layer 1.6 mm thickness PCB during Antenna Simulation on CST tool.
We are placing Antenna on top layer and providing sufficient Keep out area(Void),we are providing GND plane on both Top and Bottom layer.

Attaching image for your reference.Please provide your expertise views on this and recommend how can we possibly do it better.

over 9 years ago

0 TER over 9 years ago

TI__Guru**** 317180 points

What do you mean by: "we are not getting any response with 2 layer 1.6 mm thickness PCB during Antenna Simulation on CST tool."

Does this imply that the S11 curve is flat in simulation?

0 Nitish Dhiman over 9 years ago in reply to TER

Prodigy 120 points

Yes .that is exactly what I meant to say.

0 TER over 9 years ago in reply to Nitish Dhiman

TI__Guru**** 317180 points

That is not possible to comment why without knowing anything about how you have set up the simulation.

0 Nitish Dhiman over 9 years ago in reply to TER

Prodigy 120 points

Hi Guru,

We are simulating 4 layer PCB, by importing allegro layout file(.brd file) in CST tool and getting S11 around -20 dB for 2.45 GHz center Frequency.
Similarly we are importing 2 layer layout file in CST tool and following same procedure as 4 layer PCB but not getting any result(S11 almost 0 dB).
Please refer above image for 2 layer PCB.

0 TER over 9 years ago in reply to Nitish Dhiman

TI__Guru**** 317180 points

What is the difference between the 2 and 4 layer design seen from the antenna? If you only use one layer for the antenna 2 or 4 layer should be equal.

0 Nitish Dhiman over 9 years ago in reply to TER

Prodigy 120 points

We are using only one layer for antenna, also just changing the stack up for 4 layer board trace.

4 layer Stack Up

Trace width 15 mils

Spacing 7 mils

2 layer Stack Up

Trace width 17 mils

Spacing 5 mils

0 TER over 9 years ago in reply to Nitish Dhiman

TI__Guru**** 317180 points

If you use only one layer in both cases it should not be a difference between 2. and 4. layer. I would also expect the antenna to have a dip in S11 for a frequency, that you don't see anything it's a bit strange.

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AN043 PCB Antenna for 2 layer Board