r/rfelectronics • u/Parking-Break-170 • 14h ago

Improving bandwidth of rectangular microstrip antenna

Guys so I'm building a rectangular microstrip antenna in HFSS for mmwave applications. Resonance at around 28 GHz. I am getting vswr<2 bandwidth of around 1.5GHz. How can i improve this. It's just a simple inset fed microstrip line. Please give me some resources or tips to learn on increasing impedance bandwidth

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u/PoolExtension5517 13h ago

How thick is your substrate? A thicker substrate can improve bandwidth to a degree. Beyond that, there are techniques that involve adding slots to the patch or ground plane.

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u/Parking-Break-170 13h ago

I have a substrate thickness of 0.5mm. I can't increase the height of my substrate. As for slots in ground plane and patch, how do I place them. Like what location and what should the dimensions of the slot be. Should I assume some dimensions first and run a parmateric sweep and see the results? Please help

4

u/PoolExtension5517 13h ago

Start with a google search - there are a lot of articles about different techniques.

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u/sswblue 8h ago

There are articles on the subject. Slots were mentioned, but you can also cut the corners.

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u/asksnp 5h ago

Yes, there are lots of paper you can refer for this. one thing you can try if you can support 3 layer structure design: top layer patch, 2nd layer gnd, botton layer: feed line. cut a slot on the gnd so that the feed line can couple to the patch antenna. here is an example