microstrip patch antenna

[lostintheether]

I'm currently working on a project involving a microstrip patch antenna designed to operate at 2.4 GHz on an FR-4 substrate (dielectric constant ≈ 4.3, thickness ≈ 1.6 mm). I'm having some trouble designing an effective impedance matching network to connect it to a 50-ohm SMA connector (like a Molex 73412-1150).

Specifically, I've been experimenting with L-section matching networks using microstrip lines (calculating dimensions with tools like AppCAD). However, I'm struggling to achieve a VSWR below 1.5 across the desired bandwidth.

Has anyone had experience designing matching networks for similar patch antennas on FR-4? Are there specific topologies (like stub matching or quarter-wave transformers) or considerations I should be aware of when working with this frequency and substrate? Any tips on simulating and optimizing these networks in software like Keysight ADS or CST Studio Suite would also be greatly appreciated.

Thanks!

 

[Andrew77]

I'm currently working on a project involving a microstrip patch antenna designed to operate at 2.4 GHz on an FR-4 substrate (dielectric constant ≈ 4.3, thickness ≈ 1.6 mm). I'm having some trouble designing an effective impedance matching network to connect it to a 50-ohm SMA connector (like a Molex 73412-1150).

Specifically, I've been experimenting with L-section matching networks using microstrip lines (calculating dimensions with tools like AppCAD). However, I'm struggling to achieve a VSWR below 1.5 across the desired bandwidth.

Has anyone had experience designing matching networks for similar patch antennas on FR-4? Are there specific topologies (like stub matching or quarter-wave transformers) or considerations I should be aware of when working with this frequency and substrate? Any tips on simulating and optimizing these networks in software like Keysight ADS or CST Studio Suite would also be greatly appreciated.

Thanks!

You should feed the ustrip antenna just some mm inside, not on the border, you don't need matching unless dimensions are less than lambda/2

 

[lostintheether]

You should feed the ustrip antenna just some mm inside, not on the border, you don't need matching unless dimensions are less than lambda/2

Ok thanks, I'll go try it.